Novel color-developing agent luminosity analytical method for measuring hydrogen cyanide content in mainstream smoke quickly

Abstract

The invention provides a novel color-developing agent luminosity analytical method for measuring hydrogen cyanide content in mainstream smoke quickly, which comprises the following steps of: pretreating a sample in which hydrogen cyanide in the mainstream smoke is collected, adding a color-developing agent, and quantifying by a luminosity analytical method, wherein the color-developing agent is 4-nitrobenzaldehyde and o-dinitrobenzene; preparing potassium cyanide (KCN) solution which is added with the color-developing agent and has different concentrations to make a standard curve; and quantifying the standard curve by an external standard method, adding the color-developing agent in a cigarette absorption liquid sample, and performing photometry detection at wavelength 533 nm by an ultraviolet spectrophotometer. In the method adopting the color-developing agent containing 4-nitrobenzaldehyde-o-dinitrobenzene, the selectivity and sensitivity are high, a reaction is completed instantaneously and the interference resistant capacity is high. In addition, the method is simple in operation, cigarette sidestream smoke can be detected, the HCN in smoke environment also can be analyzed qualitatively and semiquantitatively, and the method is also suitable for field detection.

Description

technical field [0001] The invention relates to a method for measuring the content of hydrogen cyanide in mainstream smoke, in particular to a novel color developer photometric analysis method for quickly measuring the content of hydrogen cyanide in mainstream smoke. Background technique [0002] HCN is one of the important environmental pollutants. Due to its high toxicity, the control and detection of cyanide has been highly valued. Cigarette mainstream smoke and sidestream smoke also contain cyanide, but due to the complex components of cigarette smoke and HCN is easily oxidized and degraded, how to determine the HCN content in cigarette mainstream smoke has always been a challenging task. [0003] Photometric analysis is the most commonly used detection method for hydrogen cyanide, and it is also widely used in cigarette smoke analysis. Using the pyridine-pyrazolone chromogenic system, the continuous flow method based on photometric analysis for the determination of HCN...

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Problems solved by technology

But because its reaction needs to control the temperature and the reaction time is long, and pyridine also has a foul smell, so my country's tobacco industry standard adopts the isonicotinic acid-barbituric acid spectrophotometric method to analyze HCN. This method is not affected by temperature. Measurements can be completed within minutes

However, thiocyanate ions, iodide ions, bromide ions, chloride ions, sulfite ions, isocyanate ions, and carbonate ions in cigarette smoke are in the isonicotinic acid-barbet ion used in my country's tobacco industry standards. There is obvious interference in the thiocyanate spectrophotometry, among which the interference of thiocyanate ion is very large, which has a great influence on the color reaction, and the sensitivity is low

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