JPH0532703B2 - - Google Patents

Description

[Detailed description of the invention]

This invention detects the amount of copper ions in cooling water, etc. as a difference in color density, and compares this with a standard color sample to easily measure the amount of copper ions and determine the degree of deterioration of the cooling water. This relates to a method for determining. This invention was developed specifically to easily test the deterioration state of cooling water for internal combustion engines, and can similarly be applied to determining the degree of deterioration of various cooling fluids used for other purposes. Currently, the degree of deterioration of cooling water for internal combustion engines is determined by measuring the amount of dissolved metals and rust inhibitor content using analytical equipment, and the specific gravity and refractive index are also measured to control the concentration. . However, although the determination of dissolved metal content and the measurement of rust inhibitor content using analytical instruments are accurate and suitable for determining the degree of deterioration of cooling water,
These methods require expensive analytical equipment and a lot of man-hours, and it is not possible to easily determine the deterioration of cooling water on site. On the other hand, when measuring specific gravity or refractive index, it is possible to measure the concentration of antifreeze, etc., which is mainly composed of ethylene glycol, used in cooling water, but it is possible to measure the concentration of antifreeze, etc., which is used in cooling water at a low concentration of about 5%. Measuring the concentration of the agent is not possible. Furthermore, with these concentration measurements, it is not possible to measure the amount of rust preventive agent contained in the cooling water, and it is impossible to prevent troubles due to deterioration of the rust preventive agent. Nowadays, in response to the demands of the times for higher engine speeds, lighter vehicle bodies, and energy savings, modern automobile engines are increasingly being made of aluminum alloy, slimmer, or have a radiator mechanism with a lower capacity. Furthermore, the quality of radiator solutions for cooling automobile engines is gradually improving as various additives, including antifreeze and rust preventive agents, are used together with water. The improved quality of this radiator solution has made it extremely convenient for users in that it can withstand long-term use and eliminates the troublesome work of replacing it.However, as mentioned above, the small structure of the engine itself The radiator solution is placed in a harsh environment due to the use of aluminum alloys, aluminum alloys, or faster circulation of the radiator solution by powerful pumps due to the gradual decrease in the capacity of the radiator mechanism, which inevitably leads to a decline in the functionality of the additives. Rapid deterioration of the radiator solution is unavoidable. Therefore, when using the radiator solution continuously for a long period of time without replacing it as in the past,
This may even cause the engine itself to deteriorate and cause a serious accident. Therefore, it is desired to develop a technology that can easily determine the deterioration of radiator solution.
As mentioned above, a satisfactory determination technique has not yet been developed. In view of the above-mentioned circumstances, the inventor of this invention focused on copper ions, which are metal ions that greatly affect the functional deterioration of radiator solutions. This invention was completed by discovering that the degree of deterioration of a solution can be determined. Note that in addition to copper ions, aluminum ions, iron ions, lead ions, and zinc ions may exist in the radiator solution, but copper ions, which have the least tendency to ionize, have the strongest influence on other metals. It has been found that quantitative measurement of copper ions is sufficient for determining the deterioration of radiator solutions. Hereinafter, details of the present invention will be explained with reference to the drawings showing one embodiment. As shown in FIGS. 1 and 2, in the simple method for determining deterioration of cooling water for internal combustion engines, etc. of the present invention, it is necessary to prepare a reagent, an extract, and a color sample reference chart. That is, the reagent 1 is placed in a bottle 2 and stored together with a test tube 3 and a color sample standard chart 4 in a case 5 for example. The extract 6 is also placed in the bottle 7 and prepared. Reagent 1 contains a substance that can react with copper ions in the cooling water to produce a color-forming compound; such substances include sodium diethyldithiocarbamate, anhydrous sodium sulfate, sodium sulfate, triethanolamine, and
A substance composed of 200 polyethylene glycol 200S (trade name, manufactured by Sanyo Chemical Industries, Ltd.), ethylenediaminetetraacetate 4Na, sodium citrate, and alizarin cyanine blue is used. The extract liquid can be separated and extracted by dissolving the colored copper compound produced by reacting the reagent and the test solution. Examples of such extract liquids include ethyl acetate, butyl acetate, isoamyl alcohol, chloroform, carbon tetrachloride, Use methyl ethyl ketone, benzene solvent. The color sample reference chart 4 is as shown in FIG.
It shows a large number of color densities that vary in stages depending on the amount of copper ions. Next, during the test, the solution to be tested (radiator solution) is taken out and put into test tube 3, a reagent capable of producing a coloring compound is added thereto, the produced coloring compound is extracted with an extract solution, and the concentration of the copper ions is determined. The degree of deterioration of the test liquid is determined by comparing and contrasting it with color sample standard charts with different color densities. Next, three types of standard color sample charts [A], [B], and [C] are shown as examples of standard color sample charts that are prepared in advance. The reagents and samples used here are as follows. Reagent (1) Sodium diethyldithiocarbamate 2.0g Anhydrous sodium sulfate 50.0 Triethanolamine 10.0 Polyethylene glycol 200S 40.0 Dissolved by heating to form a paste. However, without adding polyethylene glycol 200S,
May be dissolved in water. Reagent (2) Sodium diethyldithiocarbamate 2.0g 4Na ethylenediaminetetraacetate 2.0 Sodium citrate 2.0 Anhydrous sodium sulfate 50.0 Triethanolamine 10.0 Polyethylene glycol 200S 33.9 and Alizarin cyanine blue 0.1 are heated and dissolved to form a paste. However, it may be dissolved in water without adding polyethylene glycol 200S. Reagent (3) Sodium diethyldithiocarbamate 20.0g Sodium sulfate (Na ₂ SO ₄・10H ₂ O) 250 Triethanolamine Dissolve 100 in water to make 1. Sample (4) Dissolve 39.2g of copper sulfate (CuSO _{4.5H 2} O) in water to make 1. Sample (5) Ethylene glycol 30.0g Water 67.0 89% phosphoric acid 0.5 Triethanolamine 1.5 Sodium benzoate 1.0

【table】

【table】

[Table] Regarding reagents (1), (2), and (3), in addition to sodium diethyldithiocarbamate, the above-mentioned reagents that react with copper ions to produce color-forming compounds are also used. Anhydrous sodium sulfate and sodium sulfate are used to facilitate separation of the test liquid and extract liquid, and work to destroy emulsification. Triethanolamine is used to keep the test solution alkaline, and improves reactivity such as clarifying and stabilizing the color development state. Polyethylene glycol 200S is used to make reagents into a paste, and is used by heating and melting or mixing and stirring with the reagents. It is possible to solidify the reagent and thereby improve ease of handling. Ethylenediaminetetraacetate 4Na and sodium citrate are for masking iron ions, zinc ions, and lead ions, and can be used as necessary. From the above color sample standard chart, it can be seen that there is a correlation between the amount of copper ions and the color density. Next, we will show an example of the results when applied to the deterioration determination of radiator fluid (actual vehicle fluid) in an actual vehicle. The liquid to be tested was taken from an automobile radiator, and its composition was as follows.

【table】

[Table] 10 ml of each test solution was taken into 25 ml graduated test tubes, and 0.2 g of reagent (1) was added to each tube, followed by vigorous shaking for about 5 minutes to completely dissolve reagent (1). Next, 10 ml of ethyl acetate was added to each, shaken vigorously for 10 seconds, and left to stand for about 5 minutes. The test sample and the extract (ethyl acetate) were completely separated, and the extract formed the upper layer. The degree of coloring of this extract was compared with color sample charts A, B, and C. As a result, the larger the amount of copper ions, the darker the color, which almost matched the color sample standards charts A, B, and C.

[Table] Collect 10 ml of each test liquid into 25 ml graduated test tubes, add 0.2 ml of reagent (2) to each test tube, and use Example 1.
As a result of performing the same operation as above, the higher the amount of copper ions, the darker the color, which is almost the color sample standard chart A,
Matched B and C. The test liquids (Nos. 7, 8, 9, and 10) containing a large amount of copper ions exhibited coloration similar to that of color sample charts A, B, and C of Example 1.

[Table] Collect 10 ml of each test liquid into 25 ml graduated test tubes, add 0.2 ml of reagent (3) to each test tube, and apply Example 1.
As a result of performing the same operation as above, the larger the amount of copper ions, the darker the color, and the color sample standard charts A, B, and C were classified almost the same as in Example 1. As described above, this invention enables detection of the amount of eluted copper ions based on the shade of color of the chelate compound produced by the reaction of copper ions with a reagent. Starting with,
Deterioration determination of various types of industrial water is extremely simple, does not require any skill, and can be performed accurately by any person. Furthermore, the reagent is easy to handle and is effective for testing and quantifying various industrial solutions, particularly for determining deterioration by quantifying copper ions in cooling water for internal combustion engines. Furthermore, reagents, chemicals, instruments, etc. can be integrated into a single case along with instructions for commercialization, making it easy to determine deterioration at each site by quantifying copper ions in coolant for internal combustion engines and other industrial water. have an effect. As is clear from the above description, according to the present invention, the amount of copper ions in the coolant is detected as a difference in color density, and by comparing this with a color sample standard chart, it is possible to easily detect the deterioration of the coolant. A method for determining deterioration of internal combustion engine cooling water can be obtained. In particular, regarding coloring reagents, sodium diethyldithiocarbamate alone hardly clarifies the coloring state or separates the test liquid, depending on the additive composition of the antifreeze solution, the base material such as ethylene glycol, and the concentration. With the coloring reagent made of the constituent materials of the present invention, the state of coloring can be clarified, the test liquid can be separated, etc. satisfactorily.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram showing an example of a set of equipment used in the determination method of the present invention, and FIG. 2 is an explanatory diagram showing a color sample reference chart. 1... Reagent, reagent bottle, 3... Test tube, 4... Color sample reference chart, 5... Case, 6... Extract liquid, 7... Extract liquid bottle.

Claims (1)

[Claims] 1 Sodium diethyldithiocarbamate, anhydrous sodium sulfate, sodium sulfate, triethanolamine, polyethylene glycol with an average molecular weight of 200, 4Na ethylenediaminetetraacetate, sodium citrate, and alizarin, which can react with copper ions in cooling water to produce color-forming compounds. A coloring reagent consisting of cyanine blue is added to cooling water, and the resulting coloring compound is mixed with ethyl acetate,
Separate and extract from cooling water with an extract consisting of at least one of butyl acetate, isoamyl alcohol, chloroform, carbon tetrachloride, methyl ethyl ketone, and benzene, and depending on the color density of the extracted color compound, A simple method for determining the deterioration of cooling water for an internal combustion engine, which comprises determining the degree of deterioration of the cooling water by measuring the amount of copper ions.