JP7634827B2 - Hypochlorous acid concentration measuring device, hypochlorous acid concentration measuring program, and hypochlorous acid concentration measuring method - Google Patents

Description

The present invention relates to a hypochlorous acid concentration measuring device, a hypochlorous acid concentration measuring program, and a hypochlorous acid concentration measuring method.

Hypochlorous acid water has been widely used as a disinfectant in the fields of food, welfare, medicine, agriculture, etc. In addition, a chlorine test paper has been known that can simultaneously measure the total residual chlorine concentration and pH value of hypochlorous acid water by a very simple method of impregnating the hypochlorous acid water to be measured (Non-Patent Document 1).

https://www. advantec. co. jp/uploads/service_support/download/catalog/16-03-6_CHLORINE%EF%BC%880-100ppm%20 %E6%AC%A1%E4%BA%9C%E5%A1%A9%E7%B4%A0%E9%85%B8%E6%B0%B4%E7%94%A8%EF%BC%89_191200. pdf

However, while conventional chlorine test strips can measure the total residual chlorine concentration in hypochlorous acid water, they cannot measure the concentration of hypochlorous acid, which has a high bactericidal effect. In other words, total residual chlorine contains not only hypochlorous acid, which has a high bactericidal effect, but also hypochlorite ions, which have a low bactericidal effect, so it is difficult to accurately grasp the bactericidal power of hypochlorous acid water by measuring the total residual chlorine concentration alone.

The present invention has been made in consideration of the above problems, and its purpose is to provide a hypochlorous acid concentration measuring device, a hypochlorous acid concentration measuring program, and a hypochlorous acid concentration measuring method that can measure the hypochlorous acid concentration in a liquid easily, quickly, and accurately.

To achieve the above object, the hypochlorous acid concentration measuring device according to the present invention is a hypochlorous acid concentration measuring device for measuring the concentration of hypochlorous acid in a liquid, and is characterized by comprising an imaging unit that captures an image of a color reaction area of a test paper that exhibits a color reaction corresponding to a component in the liquid, a calculation unit that calculates the hypochlorous acid concentration of the liquid based on image data of the test paper captured by the imaging unit, and a display unit that displays the hypochlorous acid concentration calculated by the calculation unit.

It is preferable that the apparatus further includes a measuring unit that measures the pH value and the total residual chlorine concentration of the liquid based on image data of the test paper captured by the photographing unit, and the calculation unit is configured to calculate the hypochlorous acid concentration of the liquid based on the pH value and the total residual chlorine concentration measured by the measuring unit.

In the hypochlorous acid concentration measuring device according to the present invention, it is preferable that the display unit is configured to be capable of displaying the pH value and the total residual chlorine concentration measured by the measuring unit together with the hypochlorous acid concentration.

In the hypochlorous acid concentration measuring device according to the present invention, the photographing unit is configured to be able to photograph a pH color chart and a total residual chlorine concentration color chart together with the test paper, and it is preferable that the measuring unit is configured to measure the pH value and the total residual chlorine concentration by comparing color information determined from the color reaction area of the test paper with color information determined from the pH color chart and the total residual chlorine concentration color chart.

In the hypochlorous acid concentration measuring device according to the present invention, the display unit may be configured to display the hypochlorous acid concentration as a numerical value.

The hypochlorous acid concentration measuring device according to the present invention may be a smartphone or a tablet terminal.

The hypochlorous acid concentration measurement program according to the present invention is characterized in that it causes a hypochlorous acid concentration measurement device to execute a calculation process for calculating the hypochlorous acid concentration of a liquid based on image data of a test paper that shows a color reaction corresponding to the components in the liquid, and a display process for displaying the calculated hypochlorous acid concentration.

Furthermore, the hypochlorous acid concentration measurement method according to the present invention is a hypochlorous acid concentration measurement method for measuring the concentration of hypochlorous acid in a liquid, and is characterized by including an imaging step of imaging a color reaction area of a test paper that exhibits a color reaction corresponding to a component in the liquid, a calculation step of calculating the hypochlorous acid concentration of the liquid based on image data of the test paper photographed in the imaging step, and a display step of displaying the hypochlorous acid concentration calculated in the calculation step.

The present invention provides a hypochlorous acid concentration measuring device, a hypochlorous acid concentration measuring program, and a hypochlorous acid concentration measuring method that can measure the concentration of hypochlorous acid in a liquid simply, quickly, and accurately.

FIG. 1 is a diagram showing a hypochlorous acid concentration measuring device according to an embodiment of the present invention. FIG. 2 is a diagram showing the configuration of a storage unit of the hypochlorous acid concentration measuring device according to the present embodiment. FIG. 2 is a diagram showing the configuration of a control unit of the hypochlorous acid concentration measuring device according to the present embodiment. 1 is a correlation graph showing the relationship between the abundance ratio of hypochlorous acid and pH. FIG. 2 is a diagram showing a state in which a test paper according to the present embodiment is placed on a color chart mount. FIG. 2 is a diagram showing a state in which the hypochlorous acid concentration measuring device according to the present embodiment photographs a test paper and a color chart mount. FIG. 2 is a diagram showing a state in which the measurement results of the measurement by the hypochlorous acid concentration measuring device according to the present embodiment are displayed.

The following describes preferred embodiments for carrying out the present invention with reference to the drawings. Note that the following embodiments do not limit the inventions according to the claims, and not all of the combinations of features described in the embodiments are necessarily essential to the solution of the invention. In addition, in the present embodiments, the scale and dimensions of each component may be exaggerated, and some components may be omitted.

[Overall configuration of hypochlorous acid concentration measuring device]
The hypochlorous acid concentration measuring device 1 according to the present embodiment is a mobile device such as a smartphone or tablet terminal carried by a measurer who measures the hypochlorous acid concentration, and is configured to measure the hypochlorous acid concentration in a liquid using a test paper that shows a color reaction according to the components in the liquid. Specifically, it is configured to measure the hypochlorous acid concentration in the liquid using a test paper 2 that shows a color reaction according to the pH value and total residual chlorine of the liquid.

Here, "total residual chlorine" refers to the general term for free residual chlorine with high bactericidal power and combined chlorine with low bactericidal power, and "free residual chlorine" refers to a composition consisting of chlorine gas (Cl ₂ ), hypochlorous acid (HOCl) and hypochlorite ions (ClO ^- ). In addition, "hypochlorous acid" refers to the free residual chlorine that exists as HOCl, and is a component that has a higher bactericidal power than the hypochlorite ions present in the free residual chlorine.

As shown in Figure 4, the ratio of chlorine gas, hypochlorous acid, and hypochlorite ions present in free residual chlorine changes depending on the pH of the liquid. Specifically, at pH 4 or less, it exists as chlorine gas and hypochlorous acid, at pH 4-5 it exists mostly as hypochlorous acid, at pH 5-10 it exists mostly as hypochlorous acid and hypochlorite ions, and at pH 10 or higher it exists mostly as hypochlorite ions.

As the test paper 2 used in the hypochlorous acid concentration measuring device 1 according to this embodiment, as shown in FIG. 5, a chlorine test paper having a pH color reaction area 2a that changes color in response to the pH of the liquid and a chlorine color reaction area 2b that changes color in response to the total residual chlorine in the liquid can be suitably used. However, this is not limited to this, and for example, a test paper for measuring pH and a test paper for measuring total residual chlorine may be used. In addition, the measurement range of the pH color reaction area 2a can be set to, for example, pH 4 to 8, and the measurement range of the chlorine color reaction area 2b can be set to 0 to 100 mg/L (ppm), but is not limited to this. Note that the test paper 2 can be any of various known configurations, so detailed description thereof will be omitted.

In addition, the liquid to be measured by the hypochlorous acid concentration measuring device 1 according to this embodiment is, for example, hypochlorous acid water (acidic electrolyzed water). Hypochlorous acid water is an aqueous solution containing hypochlorous acid (HClO) as the main component, which is obtained by electrolyzing an aqueous solution of hydrochloric acid (HCl) or sodium chloride (NaCl). In addition, hypochlorous acid water is classified as strong acidic electrolyzed water when the pH is 2.7 or less and the total residual chlorine concentration is 20 to 60 ppm, as weak acidic electrolyzed water when the pH is 2.7 to 5.0 and the total residual chlorine concentration is 10 to 60 ppm, and as slightly acidic electrolyzed water when the pH is 5.0 to 6.5 and the total residual chlorine concentration is 10 to 80 ppm.

Since hypochlorous acid water reduces its concentration over time due to its bactericidal action in water and its reaction with contaminants, it is necessary to periodically check the bactericidal ability of hypochlorous acid water or its conformity with standards for disinfectants. The hypochlorous acid concentration measuring device 1 according to this embodiment is a device that measures the concentration of hypochlorous acid remaining in the liquid to be measured and displays this, thereby enabling the person measuring it to recognize the bactericidal ability of the liquid to be measured and the conformity with standards for disinfectants. The configuration of the hypochlorous acid concentration measuring device 1 according to this embodiment will be described in detail below.

As shown in FIG. 1, the hypochlorous acid concentration measuring device 1 includes an imaging unit 10 for imaging the color reaction areas 2a and 2b of the test paper 2, a memory unit 11 for storing a hypochlorous acid concentration measuring program and various data, a control unit 12 for controlling the hypochlorous acid concentration measuring device 1, and a display unit 13 for displaying the measurement results of the hypochlorous acid concentration.

As shown in FIG. 6, the photographing unit 10 is configured to be able to photograph in color the color reaction areas 2a, 2b of the test paper 2 that have been colored by immersing it in the liquid to be measured. The photographing unit 10 can be, for example, a camera function of a mobile device such as a smartphone or tablet terminal. In this embodiment, the photographing unit 10 can employ various known technologies, and therefore a detailed description thereof will be omitted.

As shown in Fig. 6, the photographing unit 10 is configured to be able to photograph the test paper 2 and the color chart mount 3 (color chart) holding the test paper 2 at the same time. As shown in Fig. 5, the color chart mount 3 includes a pH color chart 3a on which a plurality of color samples for pH measurement are arranged, and a total residual chlorine concentration color chart 3b on which a plurality of color samples for total residual chlorine concentration are arranged. In this embodiment, the pH color chart 3a includes a pH 4 color sample, a pH 5 color sample, a pH 6 color sample, a pH 6.5 color sample, a pH 7 color sample, a pH 7.5 color sample, and a pH 8 color sample aligned in a row. In this embodiment, the color chart 3b for total residual chlorine concentration is arranged in a row with 0 ppm, 10 ppm, 20 ppm, 30 ppm, 40 ppm, 60 ppm, and 100 ppm color samples. The pH color chart 3a and the total residual chlorine concentration color chart 3b are spaced apart at an interval that allows the test paper 2 to be placed thereon, so that the pH color chart 3a, the total residual chlorine concentration color chart 3b, and the color reaction areas 2a and 2b of the test paper 2 can be photographed simultaneously by the photographing unit 10 with the test paper 2 placed between the pH color chart 3a and the total residual chlorine concentration color chart 3b.

In addition, as shown in FIG. 5, auxiliary markers 3c are shown near the four corners of the color chart mount 3 to assist in photographing by the photographing unit 10. Specifically, the auxiliary markers 3c are dots printed in an approximately rectangular shape and are configured to define the range photographed by the photographing unit 10. With such auxiliary markers 3c, as shown in FIG. 6, it is possible to visually confirm that the pH color chart 3a and the total residual chlorine concentration color chart 3b are within the angle of view of the photographing unit 10, that the pH color chart 3a and the total residual chlorine concentration color chart 3b are horizontal, etc. In addition, the photographing unit 10 may be configured to enable photographing only when all the auxiliary markers 3c are within the angle of view, or may be configured to be able to perform image processing, etc., to make the photographed image horizontal using the auxiliary markers 3c at the four corners.

As shown in FIG. 2, the memory unit 11 includes a program storage area 11a that stores the hypochlorous acid concentration measurement program executed by the control unit 12, and a data storage area 11b that stores various data required for the execution of the program.

The program storage area 11a stores a hypochlorous acid concentration measurement program for measuring the hypochlorous acid concentration in a liquid. Specifically, the hypochlorous acid concentration measurement program is an application installed in the hypochlorous acid concentration measurement device 1, and is configured to cause the hypochlorous acid concentration measurement device 1 to execute a read process for reading image data of the test paper 2 photographed by the photographing unit 10, a measurement process for measuring the pH value and total residual chlorine concentration of the liquid based on the image data of the test paper 2 showing a color reaction according to the pH value and total residual chlorine of the liquid, a calculation process for calculating the hypochlorous acid concentration of the liquid based on the measured pH value and total residual chlorine concentration, and a display process for displaying the calculated hypochlorous acid concentration.

The data storage area 11b stores color value data of the pH value and the total residual chlorine concentration in advance. Here, the color value data of the pH value is data indicating the pH value determined for each of all colors that the pH color reaction area 2a of the test paper 2 can display, and the color value data of the total residual chlorine concentration is data indicating the total residual chlorine concentration determined for each of all colors that the chlorine color reaction area 2b of the test paper 2 can display.

In addition, the data storage area 11b stores image data of the test paper 2 and the color chart mount 3 acquired by the photographing unit 10, data on the pH value and total residual chlorine concentration measured by the measuring unit 12a (described later), and data on the hypochlorous acid concentration calculated by the calculating unit 12b (described later).

The control unit 12 includes a hardware processor such as a CPU, RAM, and ROM, and is configured to load the hypochlorous acid concentration measurement program stored in the memory unit 11 into the RAM, and then have the CPU interpret and execute the program, thereby realizing the functions of the measurement unit 12a and calculation unit 12b described below.

Specifically, as shown in FIG. 3, the control unit 12 includes a measurement unit 12a that measures the pH value and total residual chlorine concentration of the liquid based on image data of the test paper 2 captured by the image capture unit 10, and a calculation unit 12b that calculates the hypochlorous acid concentration of the liquid based on the pH value and total residual chlorine concentration measured by the measurement unit 12a.

The measuring unit 12a is configured to measure the color of the color reaction areas 2a and 2b of the test paper 2 after the color reaction from the image data of the test paper 2 photographed by the photographing unit 10, and to measure the pH value and the total residual chlorine concentration of the liquid based on the color. Specifically, the measuring unit 12a is configured to measure the pH value and the total residual chlorine concentration by comparing the color information identified from the color reaction areas 2a and 2b of the test paper 2 with the color information identified from the pH color chart 3a and the total residual chlorine concentration color chart 3b. In addition, the measuring unit 12a is configured to measure the pH value and the total residual chlorine concentration using the color value data stored in the data storage area 11b when there is no matching color in the pH color chart 3a and the total residual chlorine concentration color chart 3b. In this case, the measurement unit 12a may be configured to identify the color that is most similar to the color of the test paper 2 among the colors shown on the color chart mount 3, and measure the pH value and total residual chlorine concentration using the identified color of the color chart mount 3 and the color value data stored in the data storage area 11b.

The calculation unit 12b is configured to calculate the hypochlorous acid concentration of the liquid based on the image data of the test paper 2 captured by the imaging unit 10. Specifically, the calculation unit 12b is configured to calculate the hypochlorous acid concentration of the liquid based on the pH value and the total residual chlorine concentration acquired from the measurement unit 12a.

More specifically, the calculation unit 12b is configured to calculate the free residual chlorine concentration of the liquid based on the total residual chlorine concentration acquired by the measurement unit 12a and stored in the data storage area 11b of the memory unit 11, calculate the presence ratio of hypochlorous acid based on the pH value of the liquid stored in the data storage area 11b, and calculate the hypochlorous acid concentration of the liquid based on the calculated free residual chlorine concentration and the presence ratio of hypochlorous acid.

Here, for example, in electrolytic water such as hypochlorous acid water, most of the total residual chlorine remaining in the liquid is composed of free residual chlorine, so the value of the total residual chlorine concentration can be applied as is as the value of the free residual chlorine concentration. In other words, the value of the total residual chlorine concentration measured by the measuring unit 12a is calculated as the value of the free residual chlorine concentration as is.

The proportion of hypochlorous acid present represents the proportion of hypochlorous acid remaining in free residual chlorine among the chlorine gas, hypochlorous acid, and hypochlorite ions present in free residual chlorine. Specifically, as shown in Figure 4, the proportion of hypochlorous acid present varies depending on the pH value of the liquid, and for example, the proportion of hypochlorous acid present is greatest when the pH value is 5.

As such, there is a correlation between the total residual chlorine concentration and the free residual chlorine concentration, and there is a correlation between the pH value, the free residual chlorine concentration, and the hypochlorous acid concentration, so it is possible to determine the hypochlorous acid concentration by determining the pH value and the total residual chlorine concentration.

As shown in FIG. 7, the display unit 13 is configured to display the hypochlorous acid concentration calculated by the calculation unit 12b. The display unit 13 is also configured to display the pH value and total residual chlorine concentration measured by the measurement unit 12a together with the hypochlorous acid concentration. Specifically, the display unit 13 is configured to display the pH value, total residual chlorine concentration, and hypochlorous acid concentration as numerical values. The display unit 13 may be a touch panel that allows touch operation, but is not limited thereto, and may employ various known devices such as a liquid crystal screen. In the hypochlorous acid concentration measuring device 1 according to this embodiment, the display unit 13 may employ various known technologies possessed by mobile devices such as smartphones and tablet terminals, and therefore detailed description thereof will be omitted.

[Method of using the hypochlorous acid concentration measuring device according to this embodiment]
Next, the hypochlorous acid concentration measuring method using the hypochlorous acid concentration measuring device 1 according to this embodiment will be described with reference to Fig. 5 to Fig. 7. Fig. 5 is a diagram showing a state in which the test paper 2 according to this embodiment is placed on the color chart mount 3, and Fig. 6 is a diagram showing a state in which the test paper 2 and the color chart mount 3 are photographed by the hypochlorous acid concentration measuring device 1 according to this embodiment. Fig. 7 is a diagram showing a state in which the measurement result of the measurement by the hypochlorous acid concentration measuring device 1 according to this embodiment is displayed.

The hypochlorous acid concentration measurement method according to this embodiment is a method for measuring the hypochlorous acid concentration in a liquid using a test paper 2 that shows a color reaction according to the pH value and total residual chlorine of the liquid, and generally includes an imaging step of imaging the color reaction areas 2a and 2b of the test paper 2, a measurement step of measuring the pH value and total residual chlorine concentration of the liquid based on the image data of the test paper 2 photographed in the imaging step, a calculation step of calculating the hypochlorous acid concentration of the liquid based on the pH value and total residual chlorine concentration measured in the measurement step, and a display step of displaying the hypochlorous acid concentration calculated in the calculation step. The hypochlorous acid concentration measurement method will be described in detail below.

First, the color reaction areas 2a and 2b of the test paper 2 are immersed in the liquid to be measured, and after the color reaction areas 2a and 2b of the test paper 2 undergo a color reaction, the color reaction areas 2a and 2b of the test paper 2 are placed on the color chart mount 3 as shown in Figure 5.

Next, as shown in FIG. 6, the photographing unit 10 is used to simultaneously photograph the test paper 2 and the color chart mount 3 holding the test paper 2 (photographing process). At this time, the photographing unit 10 photographs the auxiliary markers 3c of the color chart mount 3 within the photographing range. When the photographing is completed, the image data of the test paper 2 and the color chart mount 3 are stored in the data storage area 11b of the memory unit 11.

Next, the application installed in the hypochlorous acid concentration measuring device 1 is started, and a reading process is started to read the image data of the test paper 2 and the color chart mount 3 stored in the data storage area 11b.

When the reading process is completed, the measurement process is started. In the measurement process, the image data is acquired from the data storage area 11b, and the color after the color reaction of the color reaction areas 2a and 2b of the test paper 2 is measured from the image data by the function of the measurement unit 12a described above, and the pH value and the total residual chlorine concentration of the liquid are measured based on the color (measurement process). Specifically, the color after the color reaction of the color reaction areas 2a and 2b of the test paper 2 is measured, and the color shown on the color chart mount 3 that matches or is similar to the color of the test paper 2 is measured. In addition, the color of the color chart mount 3 acquired by the measurement and the color value data stored in the data storage area 11b are used to measure the pH value and the total residual chlorine concentration indicated by the color of the color reaction areas 2a and 2b of the test paper 2. Then, the measured pH value and the total residual chlorine concentration are stored in the data storage area 11b as the pH value and the total residual chlorine concentration of the liquid.

When the measurement process is completed, the calculation process is started. In the calculation process, the measured values of the pH value and total residual chlorine concentration are obtained from the data storage area 11b, and the hypochlorous acid concentration of the liquid to be measured is calculated from the obtained pH value and total residual chlorine concentration using the function of the calculation unit 12b described above (calculation process). Then, the calculated hypochlorous acid concentration data is stored in the data storage area 11b.

When the calculation process is completed, the pH value, total residual chlorine concentration, and hypochlorous acid concentration stored in the data storage area 11b are read out and displayed as numerical values on the display unit 13 (display process). With the above steps, a series of steps in the hypochlorous acid concentration measurement method according to this embodiment is completed. The pH value, total residual chlorine concentration, and hypochlorous acid concentration stored in the data storage area 11b can be read out at any time thereafter and displayed again.

[Advantages of the hypochlorous acid concentration measuring device according to this embodiment]
As described above, the hypochlorous acid concentration measuring device 1 according to this embodiment includes an imaging unit 10 that images the color reaction areas 2a, 2b of the test paper 2 that show a color reaction according to the components in the liquid, a calculation unit 12b that calculates the hypochlorous acid concentration of the liquid based on image data of the test paper 2 captured by the imaging unit 10, and a display unit 13 that displays the hypochlorous acid concentration calculated by the calculation unit 12b.

The hypochlorous acid concentration measuring device 1 having such a configuration makes it possible to easily measure the hypochlorous acid concentration, which could not be measured using only conventional test paper 2, by simply performing the extremely simple task of immersing the test paper 2 in liquid and causing it to develop a color. Therefore, the hypochlorous acid concentration measuring device 1 according to this embodiment can measure the hypochlorous acid concentration in liquid simply, quickly and accurately, dramatically improving the convenience of measuring the hypochlorous acid concentration.

The hypochlorous acid concentration measuring device 1 according to this embodiment further includes a measuring unit 12a that measures the pH value and total residual chlorine concentration of the liquid based on image data of the test paper 2, and is configured to be able to display the pH value and total residual chlorine concentration measured by the measuring unit 12a together with the hypochlorous acid concentration. This makes it possible to grasp the accurate pH value and total residual chlorine concentration that cannot be obtained by simply visually inspecting the test paper 2, thereby making it possible to reduce measurement variability. This advantage is particularly evident when results such as the pH value, total residual chlorine concentration, and hypochlorous acid concentration are displayed as numerical values.

Furthermore, in the hypochlorous acid concentration measuring device 1 according to this embodiment, the photographing unit 10 is configured to be able to photograph the pH color chart 3a and the total residual chlorine concentration color chart 3b together with the test paper 2, and the measuring unit 12a is configured to measure the pH value and the total residual chlorine concentration by comparing the color information identified from the color reaction areas 2a, 2b of the test paper 2 with the color information identified from the pH color chart 3a and the total residual chlorine concentration color chart 3b. According to the hypochlorous acid concentration measuring device 1 having such a configuration, it is possible to identify (calibrate) the colors of the color reaction areas 2a, 2b of the test paper 2 based on the color information of the pH color chart 3a and the total residual chlorine concentration color chart 3b, and it is possible to minimize the influence of light due to the photographing environment, so that the pH value, the total residual chlorine concentration, and the hypochlorous acid concentration can be measured more accurately.

Furthermore, since the hypochlorous acid concentration measuring device 1 according to this embodiment is a mobile device such as a smartphone or tablet terminal, it can be realized simply by installing the above-mentioned hypochlorous acid concentration measuring program (application), and has the advantage of being extremely versatile and convenient. In addition, since the hypochlorous acid concentration measuring device 1 according to this embodiment can be easily carried around, the hypochlorous acid concentration can be easily measured even in places where there is no measuring equipment.

[Modification]
The hypochlorous acid concentration measuring device 1 according to the present invention is not limited to the above-described embodiment, and various modifications can be made within the scope not departing from the technical concept of the present invention.

For example, in the above embodiment, the display unit 13 has been described as displaying the pH value and total residual chlorine concentration together with the hypochlorous acid concentration, but this is not limited thereto and may be configured to display only the hypochlorous acid concentration. Also, the display unit 13 has been described as displaying the pH value, total residual chlorine concentration, and hypochlorous acid concentration as numerical values, but this is not limited thereto and may be configured to display, for example, using a graph or the like, or may be displayed in a gradational manner such as "high," "medium," "low," "o," "△," or "x."

The display unit 13 may also be configured to display the result of whether or not the liquid complies with the standards for disinfectants (for example, "pass" or "fail"). Specifically, if the pH is 2.7-5.0 and the hypochlorous acid concentration is 10-60 ppm, or if the pH is 5.0-6.5 and the hypochlorous acid concentration is 10-80 ppm, the liquid may be determined to comply with the standards for disinfectants, and the result may be displayed on the display unit 13.

Furthermore, in addition to the above-mentioned processing, the calculation unit 12b may be configured to execute a process of calculating the ratio of chlorine gas, hypochlorous acid, and hypochlorite ions in the liquid based on the pH value acquired by the measurement unit 12a, and determining whether or not the liquid is harmful to the human body and whether or not it has a sterilizing ability, and the display unit 13 may be configured to display the determination result of the calculation unit 12b.

In the above embodiment, the pH color chart 3a and the total residual chlorine concentration color chart 3b are photographed together with the test paper 2, and the pH value and the total residual chlorine concentration are measured by comparing the color information. However, this is not limited to this, and for example, the pH value and the total residual chlorine concentration may be measured by photographing only the test paper 2 and using the color information of the test paper 2 and predetermined color value data.

In the above-described embodiment, the hypochlorous acid concentration measuring device 1 has been described as being a mobile device such as a smartphone or tablet terminal, but is not limited to this and any of a variety of hardware devices can be used.

In the above-described embodiment, the pH value and total residual chlorine concentration of the liquid are measured based on the image data of the test paper 2, and the hypochlorous acid concentration is calculated based on the measured pH value and total residual chlorine concentration, but this is not limited to the above.

It is clear from the claims that the above-mentioned modifications are included within the scope of the present invention.

1: Hypochlorous acid concentration measuring device 2: Test paper 2a: pH color reaction area 2b: Chlorine color reaction area 3: Color chart mount 3a: pH color chart 3b: Total residual chlorine concentration color chart 3c: Auxiliary marker 10: Photographing unit 11: Memory unit 11a: Program storage area 11b: Data storage area 12: Control unit 12a: Measurement unit 12b: Calculation unit 13: Display unit

Claims (8)

A hypochlorous acid concentration measuring device for measuring the concentration of hypochlorous acid in a liquid,
an imaging unit for imaging a color reaction area of the test paper which shows a color reaction corresponding to the component in the liquid;
A calculation unit that calculates the hypochlorous acid concentration of the liquid based on image data of the test paper captured by the imaging unit;
A display unit that displays the hypochlorous acid concentration calculated by the calculation unit. A measuring unit that measures a pH value and a total residual chlorine concentration of the liquid based on image data of the test paper captured by the photographing unit,
The hypochlorous acid concentration measuring device according to claim 1, characterized in that the calculation unit is configured to calculate the hypochlorous acid concentration of the liquid based on the pH value and the total residual chlorine concentration measured by the measurement unit. The hypochlorous acid concentration measuring device according to claim 2, characterized in that the display unit is configured to display the pH value and the total residual chlorine concentration measured by the measurement unit together with the hypochlorous acid concentration. The photographing unit is configured to be able to photograph a pH color chart and a total residual chlorine concentration color chart together with the test paper,
The hypochlorous acid concentration measuring device according to claim 2 or 3, characterized in that the measuring unit is configured to measure the pH value and the total residual chlorine concentration by comparing color information determined from the color reaction area of the test paper with color information determined from the pH color chart and the total residual chlorine concentration color chart. The hypochlorous acid concentration measuring device according to any one of claims 1 to 4, wherein the display unit is configured to display the hypochlorous acid concentration as a numerical value. The hypochlorous acid concentration measuring device according to any one of claims 1 to 5, characterized in that the hypochlorous acid concentration measuring device is a smartphone or a tablet terminal. A calculation process for calculating the hypochlorous acid concentration of the liquid based on image data of a test paper showing a color reaction according to the components in the liquid;
A hypochlorous acid concentration measurement program for causing a hypochlorous acid concentration measuring device to execute a display process for displaying the calculated hypochlorous acid concentration. A method for measuring a hypochlorous acid concentration in a liquid, comprising:
an imaging step of imaging a color reaction area of the test paper which shows a color reaction corresponding to the component in the liquid;
A calculation step of calculating the hypochlorous acid concentration of the liquid based on the image data of the test paper photographed by the photographing step;
A method for measuring a hypochlorous acid concentration, comprising: a display step of displaying the hypochlorous acid concentration calculated by the calculation step.

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