Analytical reagent for detecting trace lead as well as preparation method and application thereof

Abstract

The invention discloses a new analytical reagent for detecting trace lead, which has the chemical structure represented by the general formula (I). The analytical reagent is synthesized by the following two steps of reaction: firstly, using sulfanilic acid to prepare diazonium salt; then, coupling with 8-azly quinaldine to obtain the analytical reagent. The invention provides a new method for detecting trace lead based on the newly synthesized analytical reagent, and the method is applied to analysis tests in the tobacco industry. The defect of relatively low sensitivity of absorption photometry is overcome, so that the common photometry can be used for detecting mug / g level lead. The detection results of the method are consistent with the results of the graphite furnace atomic absorptionmethod.

Description

technical field The invention relates to the field of analytical chemistry, more specifically, the invention relates to an analytical reagent for determining lead in tobacco and its additives. At the same time, the invention also relates to the preparation method of the agent and the application in the tobacco industry. Background technique Lead in tobacco is a harmful element. The determination of lead in tobacco, cigarette accessories and tobacco additives is of great significance to ensure the safety of cigarette products. In the prior art, methods for determining the lead content include spectrophotometry, atomic absorption method, atomic fluorescence method, plasma emission spectrometry, plasma mass spectrometry, and the like. Spectrophotometry is the most commonly used method because of its simple equipment and low cost. At present, my country's national standard adopts the dithizone extraction photometric method, which needs to be extracted with chloroform, which i...

AI Technical Summary

Problems solved by technology

At present, my country's national standard adopts dithizone extraction photometry, which needs to be extracted with chloroform, which is not only troublesome to operate, but also consumes a large amount of organic solvents, which is easy to pollute the environment and introduces many error factors.

In recent years, although other photometric methods have been reported for the determination of lead, due to the low lead content in the sample, it needs to be enriched before it can be accurately determined by photometric method, which cannot meet the actual needs of production and needs to be improved urgently.

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