Method for measuring mercury content in loading paper for cigarette

Abstract

The invention relates to a method for testing the content of mercury in tipping paper for cigarette, which comprises using 3% hydrochloric acid to do constant volume to a certain volume after a tipper paper sample for cigarette is digested by mixed acid, utilizing sodium borohydride which contains sodium hydroxide to be reducing agent in the environment of strong acid-hydrochloric acid, deacidizing mercury in an ionic condition to elemental mercury, utilizing argon gas to be a carrier, and blowing vapor with mercury atoms under normal temperature in a cold atomic absorption spectrometry instrument to measure. Mercury atoms have a strong absorption function to a resonance line whose wavelength is 253.7nm, and the relationship between the size of absorption and the concentration of mercury atoms is in accordance with the beer law in a certain concentration scope, and the mercury atoms are compared with standard series to do constant volume. The method overcomes the shortcomings of the sample handling method in the prior art, which optimizes the concentration of acid, sodium borohydride and sodium hydroxide and the flow of carrier gas (argon gas) in a flow-injection cold atomic absorption spectrometry instrument. The invention has the advantages of simple operation, quick speed, accuracy, excellent sensitivity and repeatability.

Description

Technical field: [0001] The invention belongs to the technical field of physical and chemical inspection of tipping paper for cigarettes, and mainly relates to the technical field of determination of trace elements in tipping paper for cigarettes, in particular to a method for directly measuring mercury in tipping paper for cigarettes by using a flow injection-cold atomic absorption spectrometer content method. Background technique: [0002] According to the requirements of my country's health law, safety and health inspections should be carried out for various products that directly contact the human oral cavity. As people pay more and more attention to smoking and health issues, the safety, sanitation and environmental protection of smoking materials are getting more and more attention from all aspects. Among them, the content of heavy metals, as one of the safety indicators, has attracted more and more attention at home and abroad. However, there is no literature report...

AI Technical Summary

Problems solved by technology

[0007] From the above results, for the same sample, the mercury results tested by the national recommended standard have large deviations, and the parallel results are not ideal.

The reasons: First, the composition of the cigarette tipping paper sample is relatively complex, containing a large amount of silicon magnesium oxide, iron oxide, titanium oxide, etc., which are difficult to digest. Therefore, when testing according to the recommended standards, the cigarette tipping paper The sample cannot be completely digested, the solution is turbid and has a large amount of precipitates, and it is colored, which has caused more interference to the determination of mercury content; second, the acid removal conditions and measurement conditions after digestion are not applicable, and flow injection- Conditions of cold atomic absorption spectrometer were optimized and re-determined

Therefore, if the national recommended standard: GB / T 5009.17 is used to measure the mercury content in cigarette tipping paper samples, it cannot truly reflect the mercury content in cigarette tipping paper samples, so the above national standards cannot be applied

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