Analytical reagent for measuring trace cadmium, preparation method and application thereof

Abstract

The invention discloses a new analytical reagent for measuring trace cadmium, which has a chemical structure shown in the general formula (I). The synthesis of the analytical reagent is divided into two steps: firstly taking p-aminoazobenzene to perform diazotization to generate diazonium salt; and then coupling the diazonium salt with 8-aminoquinaldine. The invention establishes a new method for measuring cadmium on the basis of the new synthesized analytical reagent. In the method, enrichment times reaches 50 times, solid phase extraction high-time enrichment makes up for the defect of relatively low sensitivity of absorption photometry, thus the common photometry can measure the cadmium in mu g / g level content; and compared with graphite furnace atomic absorption spectrometry (GFAAS), the result measured by the method coincides with the result of the GFAAS.

Description

technical field The invention belongs to the field of analytical chemistry, more specifically, the invention relates to an analytical reagent for measuring cadmium. At the same time, the invention also relates to the preparation method of the agent and the application in the tobacco industry. Background technique Cadmium in tobacco is a harmful element. Excessive intake of cadmium by the human body will affect the effectiveness of other beneficial elements in the body, causing liver and kidney damage, emphysema, bronchitis, endocrine disorders, loss of appetite, insomnia and other problems; in addition, Cadmium is also a carcinogen that may induce prostate cancer. The determination of cadmium in tobacco, cigarette accessories and tobacco additives is of great significance to ensure the safety of cigarette products. Methods for the determination of cadmium content include spectrophotometry, atomic absorption method, atomic fluorescence method, plasma emission spectrometry,...

AI Technical Summary

Problems solved by technology

At present, my country's national standard uses dithizone extraction spectrophotometry or cadmium reagent spectrophotometry to determine cadmium. This type of method requires organic solvent extraction, which is not only troublesome to operate, but also causes great environmental pollution and introduces many error factors.

In the prior art, there are a lot of reports to measure cadmium with heterocyclic azo reagent spectrophotometry, but heterocyclic azo reagent is relatively poor to cadmium selectivity, and for some samples with low cadmium content (tobacco, cigarette auxiliary material and tobacco additives, etc.) the sensitivity of ordinary photometry can not meet the requirements of the determination

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