Method for detecting hexavalent chromium in cigarette mainstream smoke

Abstract

The invention provides a method for detecting hexavalent chromium in cigarette mainstream smoke, which comprises the following steps: a) smoking a cigarette to be detected to obtain mainstream smoke;b) trapping particulate matters in the mainstream smoke by using a quartz filter disc, extracting by using a dipotassium phosphate solution, and carrying out primary decolorization by using an HLB solid-phase extraction column to obtain a to-be-detected liquid of the particulate matters; meanwhile, capturing gas-phase substances in the mainstream smoke by adopting an absorption bottle filled withabsorption liquid, standing, and carrying out secondary decolorization by virtue of an HLB solid-phase extraction column, so as to obtain a gas-phase substance to-be-detected liquid; and c) respectively determining the content of hexavalent chromium in the particulate matter to-be-determined liquid and the content of hexavalent chromium in the gas phase matter to-be-determined liquid by adopting acontinuous flow analyzer to obtain the content of hexavalent chromium in the cigarette mainstream smoke. According to the detection method, a determination method-continuous flow method for hexavalent chromium in mainstream smoke is established for the first time, the content of hexavalent chromium in particulate matters and gas-phase matters in mainstream smoke can be respectively determined, the detection accuracy is high, the operation is simple and rapid, the cost is low, and the popularization and promotion are easy.

Description

Technical field [0001] The invention relates to the technical field of chemical analysis and detection, and more specifically, to a method for detecting hexavalent chromium in mainstream cigarette smoke. Background technique [0002] Smoking is harmful to health, and the direct reason is that mainstream smoke inhaled from the cigarette end contains a variety of harmful components, including the heavy metal element chromium. The common valence states of chromium are trivalent and hexavalent, of which hexavalent chromium is more than Trivalent chromium is 100 times more toxic. Inhalation can damage the lungs and kidneys and has a strong carcinogenic effect. Therefore, the accurate determination of hexavalent chromium content in mainstream smoke is of great significance to the evaluation of cigarette hazards. The detection methods of hexavalent chromium mainly include continuous flow method, liquid chromatography-inductively coupled plasma mass spectrometry, atomic absorption spect...

AI Technical Summary

Problems solved by technology

However, on the one hand, the mainstream smoke of cigarettes includes two parts: particulate matter and gaseous matter. The above-mentioned technical scheme only studies the particulate matter, but does not involve the gaseous phase. On the other hand, in the above-mentioned technical scheme, PCX cation exchange column adsorption extraction Trivalent chromium in the extraction solution, and then eluted, but it has not been verified whether the cation exchange column can completely absorb the trivalent chromium in the extraction solution. If not, the result is inaccurate. In fact, the purpose of the above technical solution is Simultaneous detection of hexavalent chromium and trivalent chromium by ICP-MS, of which hexavalent chromium usually exists stably in the form of chromate (negative ion) under alkaline conditions, while trivalent chromium is a cation, PCX cation exchange solid phase extraction column It is used to adsorb trivalent chromium, and hexavalent chromium is not adsorbed, so after hexavalent chromium passes through, try to elute trivalent chromium from the column to complete the separation, because hexavalent chromium is stable under alkaline conditions exists, and trivalent chromium generally exists stably under acidic conditions, so the above-mentioned technical scheme can only select neutral (pH=7.0) water as the extraction agent, both of which are unstable under this condition; while ICP-MS ( Inductively coupled plasma mass spectrometer) is expensive, and the maintenance and use costs are high, which is not conducive to popularization and application

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