JP6646192B2 - Peracetic acid product concentration determination device, and reagent used in peracetic acid product concentration determination device - Google Patents

Description

  The present invention relates to a peracetic acid preparation concentration determination apparatus, particularly to a peracetic acid preparation concentration determination apparatus for determining the concentration of a peracetic acid preparation for food, and further to a reagent used in such a peracetic acid preparation concentration determination apparatus.

  From the viewpoint of prevention of food poisoning and the like, fungicides used for foods are regarded as important. Conventionally used chlorine-based disinfectants have concerns about strong odor, low stability, persistence, and the like. Formulations are receiving attention. Peracetic acid preparations are alternatives to chlorine-based disinfectants because they have almost no odor, are highly stable after being diluted to a concentration suitable for use in food, and have very low persistence in food. It is expected as. Such peracetic acid preparations have been widely used in various countries for sterilization purposes for a wide range of foods such as vegetables, fruits, meats, and the like. On the other hand, in Japan, in recent years, designation as a food additive has been made, and production standards, usage standards, and component standards have just been announced.

Japanese Patent No. 3170526 JP 2006-242629 A

  However, although there has been an official method for confirming the component specifications of a stock solution of a peracetic acid preparation, there has been an official method for confirming a practical concentration in a diluted state for use in foods. Did not. As the measurement of the practical concentration, for example, there were a method using a test paper and a device using a device having a complicated configuration by an iodine coulometric titration method, but the method using a test paper can be easily measured, but the accuracy is high. And the reliability is particularly low on the low concentration side (for example, Patent Documents 1 and 2). In addition, since the device based on the iodine coulometric titration method is large and heavy, it is difficult to perform the measurement easily and quickly on site.

  Therefore, an object of the present invention is to provide a peracetic acid formulation concentration determination device that is easy to carry and can easily and quickly determine the concentration of a peracetic acid formulation accurately on site and a reagent used for the same. I do.

In order to solve the above-mentioned problems, a peracetic acid preparation concentration determination apparatus of the present invention includes a light-transmitting container containing a target solution obtained by adding a reagent of a predetermined concentration to a solution of a peracetic acid preparation, A light source that irradiates measurement light of a range of wavelengths, a light source control unit that controls the wavelength of the measurement light within a predetermined range, and a color sample display unit that displays a plurality of color samples corresponding to a plurality of levels of density, the container And the color sample display section are provided side by side, the peracetic acid preparation is for food, the concentration of the peracetic acid preparation is in the range of 50 mg / L to 500 mg / L, and the measurement light passes through the container. It is characterized in that the concentration of the peracetic acid formulation contained in the target solution can be determined by visually identifying the transmitted light and any of the plurality of color samples.

  In the peracetic acid preparation concentration determination apparatus of the present invention, the wavelength in the predetermined range is preferably 480 nm to 680 nm, more preferably 530 nm to 630 nm.

  In the apparatus for determining the concentration of a peracetic acid preparation of the present invention, the reagent is potassium iodide, and the predetermined concentration is preferably 5% or more, more preferably more than 5%, and even more preferably 10% or more.

  In the peracetic acid preparation concentration determining apparatus of the present invention, it is preferable that a change in absorbance calculated based on the measurement light and the transmitted light is substantially proportional to a change in the concentration of the peracetic acid preparation.

  In the peracetic acid preparation concentration determination apparatus of the present invention, it is preferable that the container and the color sample display are provided side by side.

  In the apparatus for determining the concentration of a peracetic acid preparation of the present invention, it is preferable that the plurality of color samples can be replaced according to the use of the peracetic acid preparation.

  The apparatus for determining the concentration of a peracetic acid preparation of the present invention is easy to carry, and can easily and quickly determine the concentration of a peracetic acid preparation with high accuracy on site.

(A) is a diagram conceptually showing a configuration of a peracetic acid preparation concentration determining apparatus according to an embodiment of the present invention, and (b) is a container and a color sample display unit in the peracetic acid preparation concentration determining apparatus of (a). It is a figure which shows notionally the structure arrange | positioned side by side. It is a graph which shows the change of the light absorbency with respect to the density | concentration of the peracetic acid preparation in a target solution, and shows the case where the density | concentration of potassium iodide is 2-5%. It is a graph which shows the change of the light absorbency with respect to the density | concentration of the peracetic acid preparation in a target solution, and shows the case where the density | concentration of potassium iodide is 2-5%. It is a graph which shows the change of the light absorbency with respect to the density | concentration of the peracetic acid preparation in a target solution, and shows the case where the density | concentration of potassium iodide is 5-50%. It is a graph which shows the change of the light absorbency with respect to the density | concentration of the peracetic acid preparation in a target solution, and shows the case where the density | concentration of potassium iodide is 5-50%.

Hereinafter, a peracetic acid preparation concentration determination apparatus and a reagent according to an embodiment of the present invention will be described in detail with reference to the drawings.
The configuration of the peracetic acid preparation concentration determination device will be described with reference to FIG. FIG. 1A is a diagram conceptually showing a configuration of a peracetic acid preparation concentration determining apparatus 10 according to the present embodiment, and FIG. 1B is a diagram showing a peracetic acid preparation concentration determining apparatus 10 shown in FIG. It is a figure which shows notionally the structure in which the sample display part 15 was arrange | positioned side by side.

  As shown in FIG. 1A, a peracetic acid preparation concentration determination device 10 accommodates a container 12 in a housing 11 thereof, and includes a light source 13 and a light source control unit 14. The container 12 is accommodated in a predetermined space provided in the housing 11. As shown in FIG. 1B, a color sample display unit 15 is provided on the front of the housing 11 so as to be aligned with the container 12.

  The housing 11 has predetermined water resistance and durability, and is made of a material that can be configured with a portable weight, for example, a resin material. Thereby, it is possible to prevent a malfunction from occurring even if moisture adheres by operating the container 12 with a wet hand in other situations or the like, and further, a shock is applied during transportation or operation. In this case, it is difficult to damage, so that it is possible to prevent inoperability.

The container 12 is made of a material having at least an incident surface and an outgoing surface having light transmittance, for example, a resin material or glass. The entrance surface and the exit surface are provided to face each other, and measurement light from the light source 13 is incident on the entrance surface. The measurement light transmits through the target solution in the container, and is located at the front surface of the housing 11. Out of the device.
Here, in the case 11, if at least the space in which the container 12 is accommodated is made of a material that does not transmit light, the transmitted light of the target solution is emitted from the emission surface without waste, and thus the measurement accuracy can be stabilized. .

The container 12 contains a target solution obtained by adding a reagent of a predetermined concentration to a solution of a peracetic acid preparation.
The peracetic acid preparation is a preparation for foods, and more specifically, a preparation used for the purpose of sterilizing beef, chicken, and pork meat and vegetables on the surface. Peracetic acid preparations are based on peracetic acid, or acetic acid, hydrogen peroxide, 1-hydroxyethylidene-1,1-diphosphonic acid, or octanoic acid, according to the standards set by the Ministry of Health, Labor and Welfare. And hydrogen peroxide mixed with 1-hydroxyethylidene-1,1-diphosphonic acid or octanoic acid.

  The reagent is potassium iodide, and its concentration (mass concentration) is preferably 5% or more. For example, when 5 g of potassium iodide is added to 100 mL of a solution of a peracetic acid preparation, the concentration of potassium iodide is 5% ("L" is liter). By setting the concentration of potassium iodide to 5% or more, it becomes easier to clarify the difference in the color of the transmitted light transmitted through the target solution according to the difference in the concentration of the peracetic acid preparation in the target solution. It is possible to accurately determine the concentration of the preparation. On the other hand, when the concentration of potassium iodide is less than 5%, the color of the transmitted light fluctuates and becomes unstable, so that it becomes difficult to compare and identify with the color sample display unit 15. It is difficult to visually determine the concentration of a peracetic acid preparation.

Further, the concentration of potassium iodide is preferably more than 5% from the viewpoint of color development stability. Further, when the concentration is 10% or more, the stability of color development is further improved, so that it is more preferable.
It is also preferable to add a small amount of sodium dithionite as an auxiliary agent for stabilizing color development and a small amount of a buffer composed of citric acid and disodium hydrogen phosphate for pH adjustment. Further, in order to enhance the storage stability of the solution, ethylenediaminetetraacetic acid is preferably blended in a range of 0.01% or less.

  The light source 13 irradiates the container 12 with measurement light having a wavelength in a predetermined range. As long as the wavelength range of the measurement light can be limited, the type of light source is not limited, and for example, a light emitting diode (LED) can be used. If the wavelength can be limited by using a filter, a light source having a wide emission wavelength can be used. The filter may be provided on or near the incident surface of the container 12, or may be provided with a filter function by adding a predetermined color to the incident surface of the container 12. The wavelength range of the measurement light is controlled by the light source control unit 14. The light source control unit 14 controls the operation of the light source 13, for example, controls on / off and emission intensity, in addition to controlling the wavelength.

  The wavelength of the measurement light applied to the target solution using potassium iodide as a reagent is preferably in the range of 480 nm to 680 nm. By setting in this range, the change in the absorbance calculated based on the measurement light irradiating the target solution and the transmitted light transmitted through the target solution is substantially proportional to the change in the concentration of the peracetic acid preparation. Become. Therefore, the concentration of the peracetic acid preparation can be accurately determined based on the absorbance or color of the transmitted light. On the other hand, when the wavelength of the measurement light is less than 480 nm or more than 680 nm, the change in the absorbance with respect to the change in the concentration of the peracetic acid preparation is not proportional. Is difficult to determine.

  Further, it is preferable that the wavelength of the measurement light be 530 nm or more and 680 nm or less, since the linearity of the change in absorbance with respect to the change in the concentration of the peracetic acid formulation is improved, and the accuracy of the concentration determination of the peracetic acid formulation is improved. When the wavelength of the measurement light is 530 nm or more and 630 nm or less, the intensity of the transmitted light can be maintained at a certain level or more, and it is easy to visually recognize at the time of determination. Therefore, it is possible to easily and accurately determine the concentration of the peracetic acid preparation. it can.

  The color sample display unit 15 shows a plurality of color samples corresponding to a plurality of levels of density. For example, as shown in FIG. 1B, six color samples 15a, 15b, 15c, 15d, 15e, and 15f are provided alongside the container 12. The color samples 15a to 15f have colors that can be visually identified from each other. The color samples 15a to 15f are formed so as to exhibit a reflection color by printing on a plate made of a resin material that is white and does not transmit light, for example. The colors of the color samples 15a to 15f can be set to be identifiable by the determiner, for example, by using a visible absorption spectrum of the reflected light.

  Note that a configuration is also possible in which the color sample display section 15 is made of a light transmissive material, and the color samples 15a to 15f are formed of a light transmissive film or the like so as to exhibit a transmitted color. In this case, light emitted from the light source 13 and the like may be radiated to the color sample display unit 15 from the inside of the housing 11.

  With the configuration of the color sample display unit 15 described above, the color of the transmitted light from the container 12 and the colors of the color samples 15a to 15f of the color sample display unit 15 can be easily compared. Any of the colors of the samples 15a to 15f and the color of the transmitted light can be easily identified. For each color of the color samples 15a to 15f, a spectral distribution is obtained in advance, and a correspondence relationship with the concentration of the peracetic acid preparation solution whose concentration is known is created. For this reason, by identifying the color of the transmitted light from the container 12 as one of the colors of the color samples 15a to 15f, the concentration of the corresponding peracetic acid preparation solution can be specified, so that the concentration determination can be performed simply and accurately. Can be.

  Note that the number and form of the color samples in the color sample display unit 15 are not limited to the numbers and forms illustrated in FIG. For example, the number may be less than six or seven or more. Further, instead of the configuration fixed to the housing 11 as shown in FIG. 1B, a configuration in which a plurality of color samples are arranged on a rotatable base material is also possible. In this case, for example, a plurality of color samples are arranged along the outer circumference on the surface of the disk, and each color sample is sequentially arranged with the container 12 by rotating the disk around the center of the plane. The comparison between the sample and the transmitted light from the container 12 can be facilitated.

  In addition, if the color sample of the color sample display unit 15 can be exchanged according to the use and type of the peracetic acid preparation, the color sample of the assumed range can be compared with the transmitted light. A determination can be made.

  Next, examples will be described. 2 to 5 are graphs showing changes in absorbance (vertical axis) with respect to the concentration (PAA concentration) (mg / L) (horizontal axis) of the peracetic acid preparation in the target solution. 2 and 3 show the case where the concentration of potassium iodide is 2 to 5%, and FIGS. 4 and 5 show the case where the concentration of potassium iodide is 5 to 50%. 2 and 3 show the concentrations of potassium iodide of 2.0%, 3.0%, 4.0% and 5.0%, respectively. 4 and 5 show the concentrations of potassium iodide of 5%, 10%, 20% and 50%, respectively.

  Here, as the peracetic acid preparation in the target solution, Persan MP2-J (trade name) manufactured by Envirotech Japan Co., Ltd. was used. The composition of this peracetic acid preparation is 15% peracetic acid, 40% acetic acid, 5.5% hydrogen peroxide, and less than 1% stabilizer (mass concentration).

In each of FIGS. 2 to 5, the wavelength of the measurement light applied to the container 12 is as follows.
FIG. 2 (a): wavelength 430 nm of measurement light
FIG. 2 (b): wavelength 480 nm of measurement light
FIG. 2 (c), FIG. 4 (a): wavelength of measurement light 530 nm
FIG. 3A and FIG. 4B: wavelength 580 nm of measurement light
3 (b) and 4 (c): wavelength of measurement light 630 nm
FIG. 5 (a): wavelength 680 nm of measurement light
FIG. 5B: Wavelength of measurement light 730 nm

  In the transmitted light (wavelengths 480 nm, 530 nm, 580 nm, and 630 nm) shown in FIGS. 2B, 2C, 3A, and 3B, and FIGS. 4A, 4B, and 4C. When the concentration of potassium iodide is 5%, the concentration of the peracetic acid preparation and the absorbance are substantially proportional. On the other hand, in FIGS. 2 (b), (c), 3 (a) and 3 (b), it can be seen that the concentration of the peracetic acid preparation is not proportional to the absorbance when the concentration is less than 5%.

  In the transmitted light shown in FIG. 5A, the concentration of the peracetic acid preparation and the absorbance have a substantially proportional relationship in a range where the concentration of potassium iodide exceeds 5%.

  As described above, the transmitted light shown in FIGS. 2 (b), (c), FIGS. 3 (a), (b), FIGS. 4 (a), (b), (c), and FIG. 5 (a) That is, it was found that, in the transmitted light having a wavelength of 480 nm or more and 680 nm or less, the concentration of the peracetic acid preparation and the absorbance had a substantially proportional relationship depending on the concentration of potassium iodide.

Comparing the figures, it can be seen that when the wavelength of the measurement light is in the range of 530 nm to 680 nm, and further in the range of 530 nm to 630 nm, the linearity of the change between the concentration of the peracetic acid preparation and the absorbance increases.
Although the present invention has been described with reference to the above embodiments, the present invention is not limited to the above embodiments, and can be improved or changed within the scope of the purpose of improvement or the concept of the present invention.

  As described above, the device for determining the concentration of a peracetic acid preparation according to the present invention is useful because it is easy to carry and can easily and quickly determine the concentration of a peracetic acid preparation on site with high accuracy.

DESCRIPTION OF SYMBOLS 10 Peracetic acid formulation concentration determination apparatus 11 Housing 12 Container 13 Light source 14 Light source control unit 15 Color sample display unit 15a, 15b, 15c, 15d, 15e, 15f Color sample

Claims (7)

A light-transmissive container containing a target solution obtained by adding a reagent of a predetermined concentration to a solution of a peracetic acid preparation,
A light source for irradiating the container with measurement light having a predetermined range of wavelengths,
A light source control unit that controls the wavelength of the measurement light within the predetermined range,
A color sample display unit that shows a plurality of color samples corresponding to a plurality of levels of density,
The container and the color sample display unit are provided side by side,
The peracetic acid preparation is for food, and the concentration of the peracetic acid preparation is in a range of 50 mg / L to 500 mg / L;
The concentration of the peracetic acid preparation contained in the target solution can be determined by visually identifying the transmitted light transmitted through the container with the measurement light and any of the plurality of color samples. Acetate concentration determination device.   The peracetic acid formulation concentration determination device according to claim 1, wherein the wavelength in the predetermined range is 480 nm or more and 680 nm or less.   3. The apparatus for determining a concentration of a peracetic acid preparation according to claim 2, wherein the wavelength in the predetermined range is 530 nm or more and 630 nm or less.   The peracetic acid formulation concentration determination device according to any one of claims 1 to 3, wherein the reagent is potassium iodide, and the predetermined concentration is 5% or more.   The apparatus according to claim 4, wherein the predetermined concentration exceeds 5%.   The peracetic acid preparation concentration determination device according to claim 5, wherein the predetermined concentration is 10% or more. The peracetic acid preparation concentration determination device according to any one of claims 1 to 6, wherein the plurality of color samples are exchangeable according to the use of the peracetic acid preparation.