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Detection method for active oxygen in fruit and vegetable washing salt

A fruit and vegetable washing and detection method technology, applied in the field of analytical chemistry, can solve the problems of cumbersome reaction steps, cumbersome operations, easy deterioration of starch, etc., and achieve the effects of improving detection sensitivity, good chemical stability and low surface tension

Inactive Publication Date: 2017-10-24
CHINASALT JINTAN
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Problems solved by technology

The chemical titration method is divided into direct titration method potassium permanganate method and indirect titration method iodometric method. The principle of the former is to use the reducing properties of active oxygen to directly titrate with potassium permanganate solution. Calculating the content of active oxygen by the amount used, GB / T13173-2008 Surfactant detergent test method and HG / T 2764-2008 Industrial sodium percarbonate for the detection of active oxygen are all such detection methods, this method is simple to operate, The detection is fast, but the disadvantage is that the washing salt contains organic substances such as surfactants, and the detection sensitivity will be greatly affected in complex systems such as organic substances. Therefore, the above-mentioned national standards and industry standards cannot accurately detect the content of active oxygen in washing salt The principle of the latter is that active oxygen oxidizes potassium iodide in dilute sulfuric acid to produce quantitative iodine, uses starch as indicator, adds catalase, titrates with sodium thiosulfate standard solution to obtain titration volume, and finally calculates active oxygen content, the reaction steps of this method are cumbersome, the reaction time is long, and there are many types of drugs, and the starch is easy to deteriorate, and the deteriorated starch will wrap the iodine element, resulting in low detection accuracy
Spectrophotometry uses a spectrophotometer to detect the linear relationship between the concentration of active oxygen and the absorbance of light at a specific wavelength or within a certain wavelength range, thereby realizing the detection of the concentration of active oxygen, but before the test, it is necessary to use a standard substance to do the corresponding test. Contrast curves, increasing the complexity of operation and measurement time
High performance liquid chromatography is a new type of separation and analysis technology developed on the basis of classic liquid chromatography combined with gas chromatography theory. By injecting mobile phase samples into the chromatographic analyzer, the components are separated, and then by The recorder performs data processing and records chromatographic signals, so that the content of active oxygen can be detected, but the cost of the instrument and use are high, and the operation is relatively cumbersome

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  • Detection method for active oxygen in fruit and vegetable washing salt
  • Detection method for active oxygen in fruit and vegetable washing salt
  • Detection method for active oxygen in fruit and vegetable washing salt

Examples

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Embodiment 1

[0014] Select standard sodium percarbonate, measure the active oxygen content of standard sodium percarbonate according to HG / T 2764-2008 to be 13%, take m gram of standard sodium percarbonate and add it to the salt whose weight is X, then the active oxygen content in the salt is Oxygen content = m*13% / X*100%, prepare six kinds of fruit and vegetable washing salts according to the above method, respectively numbered as 1#, 2#, 3#, 4#, 5#, 6# samples, the corresponding active oxygen The content formula values ​​are 0.70%, 0.50%, 0.35%, 0.40%, 0.45%, 0.60%, each accurately weigh 5.00g of the above samples, take 1# sample and place it in a 150mL high neck beaker, add 20g of deionized Wet the washing salt with water, add 80 mL of sulfuric acid with a concentration of 1.5 mol / L to completely dissolve the washing salt, check that the pH value is 4, add 0.15 g of polyether siloxane copolymer emulsion defoamer with a solid content of 18% , be titrated with the standard titration solut...

Embodiment 2

[0027] Select fruit and vegetable washing salts on the market: X, Y, Z, accurately weigh 5.00g samples respectively, take X samples and place them in a 150mL high-necked beaker, add 15g deionized water to wet the washing salt, add 70mL concentration The sulfuric acid of 1.5mol / L dissolves all the washing salts, and the pH value of the test is 4. Add 0.10g of polyether siloxane copolymer emulsion defoamer with a solid content of 18%, and use a high concentration of 0.2080mol / L Titrate the potassium permanganate standard titration solution until the solution is pink and does not disappear for at least 60 seconds. Take this as the titration end point, record the volume V of the potassium permanganate standard titration solution used in the titration, and calculate the fruit and vegetable washing volume according to the amount of potassium permanganate. The content of active oxygen in salt ω1, according to the above steps, respectively take samples Y and Z to test the content of ac...

Embodiment 3

[0031]Select the same commercially available fruit and vegetable washing salts as in Example 2: X, Y, Z, accurately weigh 5.00g samples respectively, take X samples and place them in a 150mL high-necked beaker, add 10g deionized water to make the washing salt Wet, add 55mL of sulfuric acid with a concentration of 1.5mol / L to dissolve all the washing salts, check that the pH value is 5, add 0.05g of polyether siloxane copolymer emulsion defoamer with a solid content of 18%, and use a concentration of The potassium permanganate standard titration solution of 0.2080mol / L is titrated until the solution is pink and does not disappear for at least 60 seconds. This is the titration end point, and the volume V of the potassium permanganate standard titration solution used for the titration is recorded. Calculate the active oxygen content ω1 in the fruit and vegetable washing salt according to the amount of the active oxygen used in the fruit and vegetable washing salt. According to the...

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Abstract

The invention belongs to the field of analytic chemistry and particularly relates to a detection method for active oxygen in fruit and vegetable washing salt. Corresponding substances are weighed in a mass ratio of the fruit and vegetable washing salt, deionized water and a defoaming agent being 1:(2-4):(0.01-0.03), the deionized water is added to the washing salt to wet the washing salt, sulfuric acid with concentration being 0.5-4 mol / L is added to dissolve the washing salt completely, pH value of a solution is enabled to be 3-6, then the defoaming agent is added, a potassium permanganate standard titration solution with the concentration being 0.1-1 mol / L titrates the solution until the solution is pink and the pink color does not disappear in at least 60 s, the moment is taken as the titration end point, the volume of the potassium permanganate standard titration solution applied to titration is recorded, and the content of the active oxygen in the fruit and vegetable washing salt is calculated according to the use amount of potassium permanganate. According to the detection method, tedious steps are not needed, all that is required is to utilize the defoaming agent to damage foam rapidly and effectively, active oxygen in the fruit and vegetable washing salt can be effectively detected, and the applicable range is wide.

Description

technical field [0001] The invention belongs to the field of analytical chemistry, in particular to a method for measuring active oxygen in fruit and vegetable washing salt. Background technique [0002] Varieties of salt can be divided into edible type (seasoning, health care, and food processing) and functional type (daily chemical, animal husbandry and aquaculture, water treatment, road snow melting, and industrial salt, etc.) according to their uses. Fruit and vegetable washing salt is a functional salt for daily use. It was developed earlier in Europe, the United States, Japan, Korea and other countries. Now it has a certain production scale, formed a stable market, and the production technology is relatively mature. At present, the domestic daily chemical salt market is in the initial development stage. With the improvement of people's living standards and the strengthening of nutrition and health care awareness, the demand for fruit and vegetable washing salt and its ...

Claims

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Application Information

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IPC IPC(8): G01N31/16
CPCG01N31/16
Inventor 刘会祥崔耀星谢兴胜王佩琪孙桀
Owner CHINASALT JINTAN