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Method for determining pH value of main stream smoke of cigarette by using pH electrode

A cigarette mainstream smoke and electrode technology, applied in the field of tobacco chemical analysis, can solve the problems of inability to reflect, pH meter is not suitable for smoke, etc., and achieve the effect of accurate reaction

Inactive Publication Date: 2014-07-16
SICHUAN UNIV +1
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Problems solved by technology

The disadvantage of this method is that the buffer solution coated on the surface of the pH electrode has a certain buffer capacity, which has a certain influence on the slight change of the flue gas pH, so the measured pH cannot reflect the real flue gas pH value
This method is convenient and quick, but the disadvantage is that the pH meter is not suitable for direct measurement of flue gas in multi-component and heterogeneous systems.

Method used

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  • Method for determining pH value of main stream smoke of cigarette by using pH electrode
  • Method for determining pH value of main stream smoke of cigarette by using pH electrode
  • Method for determining pH value of main stream smoke of cigarette by using pH electrode

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Embodiment Construction

[0014] The present invention will be further described below in conjunction with the accompanying drawings and implementation examples.

[0015] Experimental part

[0016] 1. Instruments and reagents

[0017] Gas flow meter (Brooks Instrument, 0154); pH meter and pH composite electrode (Orion SA 720), N2000 data workstation (Hangzhou Saizhi Technology Co., Ltd.).

[0018] Polyethylene glycol-20000 (PEG-20000), sodium chloride, all of which are of analytical grade; nitrogen (99.99%); double distilled water; 5 kinds of domestic brand cigarettes.

[0019] 2. Preparation of Absorption Solution

[0020] Add 5g of PEG-20000 and 54mL of 0.1 M NaCl aqueous solution into a 100mL beaker, stir for about 15 minutes to make it evenly mixed.

[0021] 3. Experimental procedure

[0022] refer to figure 2 , Install the flue gas pH value measuring device, measure and record the potentials corresponding to the three standard buffer solutions with pH values ​​of 4.00, 6.86, and 9.18 res...

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Abstract

The invention discloses a method for determining a pH value of main stream smoke of a cigarette by using a pH electrode. The method is mainly applicable to research on the cigarette quality through the pH value of the smoke in the tobacco industry. The method comprises the following steps: firstly, putting the pH electrode into 10% PEG-20000 / 0.1M of NaCl water solution, thus forming a layer of absorption liquid film on the surface of a glass film; quickly putting the electrode into a flow cell; connecting a carrier gas; igniting the cigarette and pumping the smoke after the system is stable; recording the change of the pH electrode caused by the smoke, and deducting a base line, so as to obtain the pH value of the smoke. The method has the advantages that the pH value of each bite of smoke can be determined in real time, and the pumping quality of the cigarette can be accurately reflected.

Description

technical field [0001] The invention relates to a method for measuring the pH value of cigarette mainstream smoke by using a pH electrode, belonging to the field of chemical analysis of tobacco. Background technique [0002] With the development of tobacco chemistry, the determination of pH value in mainstream cigarette smoke has attracted more and more attention. Studies have shown that the pH value of mainstream smoke can directly reflect the proportion of free nicotine in total nicotine in mainstream smoke. The proportion of free nicotine is directly related to the strength of cigarettes, so the pH value of mainstream smoke reflects the strength of smoke, the irritation of smoke and the amount of nicotine inhaled felt by smokers. Different types of cigarettes have great differences in the pH value of the smoke, and different additives will also have a greater impact on the pH of the smoke. Therefore, investigating the pH value of cigarette smoke is not only an important ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/26G01N27/30
Inventor 郭勇龙君杨钦兰肖丹李秀婷朱晓琼雷德安
Owner SICHUAN UNIV
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