Rapid testing method of zinc salt in milk

Abstract

The invention relates to a rapid testing method of a zinc salt in milk, which comprises the following steps that: 2ml of a standard milk sample and 2ml of a milk sample to be tested are respectively added into 1ml of dithizone-carbon tetrachloride solution with the concentration of 0.1g / L; the standard milk sample is mixed with the dithizone-carbon tetrachloride solution uniformly to prepare a mixture A, and the color liquid surface dots of the mixture A and the color of lower layered liquid serve as standard color disks; the milk sample to be tested is mixed with the dithizone-carbon tetrachloride solution uniformly to prepare a mixture B, the color of liquid surface dots of the mixture B and the color of the lower layered liquid are observed; the color of the liquid surface dots of the mixture B and the color of the lower layered liquid are visually compared with the color of the standard color disks, if the color of the liquid surface dots is the same with the color of the lower layered liquid, the zinc content of the milk sample to be tested is above 50mg / kg, and if the color of the liquid surface dots is different from the color of the lower layered liquid, the zinc content of the milk sample to be tested is below 50mg / kg. The method has the advantages of low cost, convenient and rapid operation and short testing time, and is a rapid qualitative testing method.

Description

technical field [0001] The invention relates to a detection method for adulterated components in milk, in particular to a rapid detection method for zinc salt adulteration in milk, which belongs to the technical field of chemical component detection. Background technique [0002] When buying fresh milk, some unscrupulous traders will add zinc salts to the milk to increase some physical and chemical indicators of the milk by deceptive means. In order to ensure the quality of the fresh milk purchased, it is necessary to inspect a large amount of fresh milk when purchasing. However, the current methods for detecting the adulteration of zinc salts in milk are limited, and most of them require the help of various instruments, and the testing steps are cumbersome, and the operability is poor when purchasing a large amount of fresh milk, which cannot meet the actual needs. [0003] "Direct Determination of Urinary Zinc by Dithizone Carbon Tetrachloride Method" (Liu Hanfang, "Chines...

AI Technical Summary

Problems solved by technology

However, the current methods for detecting the adulteration of zinc salts in milk are limited, and most of them require the help of various instruments, and the test steps are cumbersome, and the operability is poor when purchasing a large amount of fresh milk, which cannot meet the actual needs

[0003] "Direct Determination of Urinary Zinc by Dithizone Carbon Tetrachloride Method" (Liu Hanfang, "Chinese Journal of Health Inspection", Volume 18 of the seventh issue in 2008, pages 1302-1303) discloses a method for detecting zinc salts in solution , but this test method is cumbersome, and auxiliary reagents must be added to prevent other substances from interfering with the test results. It is not suitable for rapid detection when purchasing milk

[0004] In addition, the test method for zinc content in food in the national standard is a quantitative test, which is not suitable for simple detection when purchasing a large amount of fresh milk

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