Gas-phase nicotine electrochemical determination method based on passive sampling method
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A measurement method and passive sampler technology, applied in the field of electrochemical analysis and detection, can solve the problems of lack of tobacco smoke sampling and detection methods, difficulty in preparing or purchasing electrodes, high cost, etc., and achieve specific response and good reproducibility , The effect of stable electrode performance
Active Publication Date: 2021-10-29
TONGJI UNIV
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After the "Framework Convention on Tobacco Control" came into force in my country in January 2006, a lot of tobacco control work has been carried out one after another. Although the exposure to second-hand smoke has improved, all indoor workplaces and indoor public places stipulated in the "Convention" should be within reach. The smoke still has a long distance, and the lack of sampling and detection meth
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Embodiment 1
[0039] Embodiment 1: the gas-phase nicotine electrochemical determination method based on the passive sampling method, the specific steps are as follows:
[0040] (1) Pretreatment of the working electrode:
[0041] Select a screen-printed gold electrode, add 120 μL of 0.5mol / L H 2 SO 4 The solution is electrochemically treated by cyclic voltammetry at -0.3V-1.5V until a stable cyclic voltammetry diagram is obtained; the screen-printed gold electrode adopts SPE standard size, with a diameter of 5 mm to 1 cm.
[0042] (2) Drawing of standard curve:
[0043] Configure 0.01mol / L PBS buffer solution: weigh 0.135g KH 2 PO 4 , 0.71g Na 2 HPO 4 12H 2 0, 4gNaCl, 0.1g KCl, add 400mL deionized water and stir to dissolve fully, add concentrated hydrochloric acid to adjust the pH to 7.4, and dilute to 500mL with deionized water to obtain a 0.01mol / L PBS buffer solution;
[0044] Prepare solutions containing different concentrations of nicotine in 0.01mol / L PBS buffer solution, as n...
Embodiment 2
[0049] Example 2: Construction of a portable and fast nicotine electrochemical sensor
[0050] Such as figure 1 As shown, the handheld portable electrochemical workstation is connected with the gas-phase passive sampler. The gas-phase passive sampler is a sealed space with front and rear openings. Pre-treated screen-printed gold electrodes in handheld portable electrochemical workstations;
[0051] The gas-phase passive sampler is arranged in parallel from the front opening to the rear: front cover, permeable membrane, gasket, hydrogel sheet, bottom bracket, hydrogel enriched with nicotine, mechanical arm, and support.
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Abstract
The invention provides a gas-phase nicotine electrochemical determination method based on a passive sampling method, which comprises the following steps: selecting a silk-screen printing gold electrode, adopting a sulfuric acid solution to electrochemically preprocessing an electrode, selecting a handheld portable electrochemical workstation to construct a portable nicotine electrochemical sensor, and connecting a gas-phase passive sampler and an electrochemical detection device for use; placing the device in a closed box, exposing the device in flue gas environments with different concentrations, and performing detecting in a voltage range of 0.5-0.9 V by adopting a square wave voltammetry to obtain a characteristic response current value of nicotine; detecting the actual tobacco sample according to the method, obtaining the nicotine response current value, substituting the response current value into the standard curve and the corresponding linear regression equation, and obtaining the concentration of nicotine in the sample. The method is easy and convenient to operate and low in detection cost, tedious sample pretreatment and separation are not needed, and direct detection of nicotine is achieved. The abstract drawing is a schematic diagram for detecting nicotine.
Description
technical field [0001] The invention relates to the technical field of electrochemical analysis and detection, in particular to an electrochemical method for measuring the concentration of nicotine in smoke. Background technique [0002] Tobacco is a special economic crop with a long history, which is widely planted in countries such as the United States, China, India, Brazil and Cuba. The total output, total area and cigarette production of tobacco planting in my country rank first in the world at present, and it has become an important source of consumption and taxation in my country. Smoking is harmful to health is a major issue of common concern around the world, reducing the harm caused by smoking to the greatest extent, and retaining the unique aroma and taste of tobacco are the two development directions of the tobacco industry. [0003] Nicotine (Nicotine, also known as nicotine (1-methyl-2 (3-pyridyl) pyrrolidine), referred to as NCT, the content in tobacco is abou...
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