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Method for measuring trace mercury in main stream smoke of cigarette

A technology of cigarette mainstream smoke and measurement method, which is applied in the direction of color/spectral characteristic measurement, etc., can solve problems affecting the determination of trace mercury elements, and achieve the effects of carrier gas flow optimization, high sensitivity, and low harm

Active Publication Date: 2012-06-13
ZHENGZHOU TOBACCO RES INST OF CNTC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Among many methods, the cold atomic absorption method has the advantages of good experimental repeatability, high precision, high sensitivity, and strong anti-interference ability. However, mainstream cigarette smoke is a special sample for measurement, which contains many types of other impurities. Metal elements and organic matter, and mercury elements mostly exist in the form of organic mercury, which affects the determination of trace mercury elements and makes the final measurement results more accurate

Method used

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  • Method for measuring trace mercury in main stream smoke of cigarette

Examples

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Embodiment

[0026] The assay method of trace mercury in cigarette mainstream smoke of the present invention is as follows:

[0027] 1. Preparation of capture solution: Roughly measure 500ml of ultrapure water into a 1000ml volumetric flask, slowly add 200ml of 98% (volume percentage) concentrated sulfuric acid, shake well and cool to room temperature; then add 50g of potassium permanganate into the volumetric flask Shake gently until all the solids are dissolved, then dilute to 1000ml with ultrapure water. During the preparation process, the solution will have a slight reaction and produce a small amount of gas, pay attention to open the volumetric flask to deflate, the solution after constant volume is 5% (mass fraction) acidic potassium permanganate solution;

[0028] 2. Sample collection: connect two absorption bottles containing 30mL 5% potassium permanganate solution in series between the cigarette holder and the suction syringe, and test the suction capacity of the smoking machine a...

experiment example

[0038] This experimental example investigates the repeatability, detection limit, recovery rate of standard addition, and influence of coexisting ions of the determination method of trace mercury in mainstream cigarette smoke of the present invention.

[0039] 1, repeatability and detection limit: get the mercury standard working solution of preparation 0.1 μ g / L and adopt the method for step 4 in the embodiment to carry out 7 parallel determinations, the relative standard deviation (RSD) of determination is 2.3%. Simultaneously according to this assay method, the blank solution was measured 11 times, and its detection limit was found to be 0.03 μg / L with 3 times the standard deviation. The results of the assay are shown in Table 3 and Table 4.

[0040] Table 3 7 determination results of 0.1μg / L mercury standard working solution

[0041] 1

2

3

4

5

6

7

RSD

Absorbance

0.0046

0.0048

0.0047

0.0049 ...

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Abstract

The invention discloses a method for measuring trace mercury in main stream smoke of a cigarette, which comprises the following steps: adopting aqueous solution of acid potassium-permanganate to catch the trace mercury in the main stream smoke; performing microwave-assisted digestion on the solution of the acid potassium-permanganate after the catching; after the digestion, reducing redundant potassium-permanganate to obtain sample solution; and taking acid stannous chloride solution as a reducing agent, and adopting a cold atomic absorption spectrometer to measure the content of the mercury element in the sample solution. In the measuring method, the acid potassium-permanganate is adopted as catching solution and can catch the mercury element in various forms in the main stream smoke of the cigarette, the catching efficiency is high, elements to be measured in the sample have less loss, the harm to operators is low, the potassium-permanganate after the catching can be directly subjected to microwave-assisted digestion, extra acid liquor is not required to be added, the acid liquor is saved, and the operation is easy; the cold atomic absorption spectrometry is adopted to measure the content of the mercury element and has good repeatability and high sensitivity, measuring results are accurate, and recovery rate is high.

Description

technical field [0001] The invention relates to a method for determining trace elements in mainstream smoke of cigarettes, in particular to a method for determining trace mercury in mainstream smoke of cigarettes. Background technique [0002] As people pay more and more attention to health problems and environmental problems, the determination of trace mercury in cigarettes and cigarette smoke has received extensive attention. As a special consumer product, cigarettes undergo a series of complex changes in their internal chemical composition when burned at high temperatures, thus forming mainstream smoke. Cigarette mainstream smoke is a complex aerosol system containing more than 5000 gas and particle components. As one of the important harmful elements in the mainstream smoke of cigarettes, mercury will enter the human body along with the mainstream smoke and cause certain harm to the human body. The current national health standard GB / T 500917-2003 specifies methods for...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/31
Inventor 庞永强侯宏卫陈再根唐纲岭陈欢姜兴益朱凤鹏李雪胡清源
Owner ZHENGZHOU TOBACCO RES INST OF CNTC