Ion chromatography method for detecting iodate and bromate in cosmetic

Abstract

The invention relates to a detection method for trace forbidden or restricted iodate and bromate in a cosmetic, and aims to provide the method which has the characteristics of high specificity, high anti-interference capacity and high accuracy. According to the technical scheme, the ion chromatography method for detecting iodate and bromate in the cosmetic comprises the following steps of: (1) preparing a sample: weighing a certain amount of cosmetic and placing in a centrifuge tube, and adding ultra-pure water to keep constant volume for later use; or adding the ultra-pure water and then ultrasonically oscillating, then loading on a centrifuge for centrifugal separation, taking supernatant and keeping constant volume for later use by using the ultra-pure water; or adding a certain amount of methylene dichloride, uniformly mixing through vortex, adding the ultra-pure water, ultrasonically oscillating, then loading on a centrifuge for centrifugal separation, taking the supernatant and keeping constant volume for later use by using the ultra-pure water; (2) enriching and purifying: taking the supernatant and collecting eluent through a water-phase filter membrane and an RP (Reversed Phase) column; and (3) loading on a machine for detection: taking the eluent and inputting into an ion chromatograph equipped with a post-column derivation device and an ultraviolet detector for detection.

Description

technical field [0001] The invention relates to a detection method, in particular to a detection method for trace prohibited or restricted use of iodate and bromate in cosmetics. Background technique [0002] In recent years, with the improvement of people's living standards in our country year by year, the production and sales of China's cosmetics market are booming. The relationship between cosmetics and human beings is getting closer and closer, and its degree is no less than that of food. With the popularity of the cosmetics market, people pay more attention to the safety of cosmetics, and the establishment of a systematic and safe sanitation testing method is unstoppable. [0003] Investigate the cosmetics brands commonly used by professional women aged 20 to 35, and select several common cosmetics brands with good and poor feedback from the users for measurement. The following principles are followed in sample selection: 1) Cosmetics of different brands with similar e...

AI Technical Summary

Problems solved by technology

This method detects bromate with ion chromatography-conductivity detector, has a lot of shortcomings: the pre-treatment weighs a large amount, the matrix is ​​complex, and there are many interferences; and the content of bromate and iodate in cosmetics is low , the required detection sensitivity and accuracy are higher, so the detection method of bromate in flour is not suitable for cosmetics

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