Five methods for detecting heavy metal in tobacco and tobacco products - Master's thesis - Dissertation

2023-01-02 06:07:54

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Five methods for detecting heavy metal content in tobacco and tobacco products
$/>A study reported that the levels of heavy metals such as Pb, As, and Cd in 13 Chinese brands were seriously exceeded. These heavy metals enter the human body in the form of smoke during the smoking process of tobacco, which is harmful to human health. Therefore, accurate determination of the content of these heavy metal elements is of great significance for identifying and judging the quality of cigarettes. Most brands of cigarettes have heavy metal elements such as Pb, As, and Cd. These heavy metals enter the human body in the form of smoke during the smoking process of tobacco, which is harmful to human health. Therefore, accurate determination of the content of these heavy metal elements is of great significance for identifying and judging the quality of cigarettes. The most commonly used methods for the determination of heavy metals in tobacco and tobacco products are ICP-MS and atomic absorption spectroscopy. The ICP-MS method is fast and can simultaneously detect multiple elements. Therefore, in tobacco The application of the industry has gradually become more and more extensive. SpectrophotometryThis is to determine the absorbance or luminescence intensity of a substance at a specific wavelength or a certain wavelength range, and to characterize and quantify the substance. Method of analysis. The method has the advantages of simple equipment and operation, low cost, fast analysis speed, high sensitivity, good selectivity, good accuracy and accuracy. In a study, a new method for the determination of mercury in cigarettes by flow injection catalytic spectrophotometry was established by using the catalytic effect of mercury on the oxidation of azurol by potassium bromate. The recovery rate was 97.8%~102.7%, which met the requirements. Atomic spectroscopyThis is based on the absorption of the corresponding atomic resonance radiation in the ultraviolet and visible range based on the outer electrons of the ground state atom of the gaseous state. Elemental content-based analytical method. It mainly includes atomic emission spectroscopy (AES), atomic absorption spectroscopy (AAS), atomic fluorescence spectroscopy (AFS), and X-ray fluorescence spectroscopy (XFS). Among them, AAS is an analytical method established by using the absorption properties of atoms on radiation, and is mainly used for quantitative analysis of trace elements. Inductively Coupled Plasma Mass Spectrometry (ICP-MS)It is a mass spectrometric analysis method using plasma generated by inductive coupling as an ion source. Simultaneous determination of multiple elements, the method has the characteristics of high sensitivity, fast speed and less interference. The content of arsenic, cadmium, mercury and lead was determined by inductively coupled plasma right angle accelerated time-of-flight mass spectrometry (ICP-oaTOF-MS) in 21 tobacco samples. The correlation curve of standard curve was >0.9998, and the recovery was 91.49%~106.25. %, RSD<2%, detection limit is 0.093~0.168Î¼g/L. Ion ChromatographyIt is a method of continuously detecting the ions separated by chromatography by installing an improved conductivity detector behind an ion exchange resin column. The analysis of tobacco leaf samples has the characteristics of simple, rapid, low detection limit, high sensitivity, high accuracy and good selectivity. At present, this method has not been used in the field of heavy metal detection for other tobacco and tobacco products, and has broad application value. The pre-test instrument preparation of this method is cumbersome and complicated, and needs to be improved and improved. High Performance Liquid ChromatographyThis method uses a liquid as the mobile phase and a high pressure infusion system to use a single solvent with different polarities or a mixed solvent of different proportions. The mobile phase such as buffer is pumped into the column containing the stationary phase. After the components in the column are separated, they enter the detector for detection, thereby realizing the analysis of the sample. SummaryIn addition to the above five commonly used assay methods, heavy metal immunological detection methods, electrochemical methods, etc. are also used for the detection of heavy metals in tobacco products, but There are relatively few applications. There are advantages and disadvantages in the detection methods of heavy metal ions in tobacco. Among them, atomic spectroscopy is the most widely used, which has the characteristics of high sensitivity, good selectivity and wide measurement range. In particular, atomic emission spectroscopy is suitable for multi-element detection, and the efficiency is high. Spectrophotometry needs to find a suitable color developer, and needs to be enriched, which limits the application of the method; high-performance liquid chromatography can realize multi-element Simultaneous determination, so the application is becoming more widespread. </div> </div> <div class="tech-detail-share">  <div class="bdsharebuttonbox"> <a href="#" class ="bds_qzone" data-cmd="qzone" title="Share to QQ space"></a> <a href="#" class="bds_tsina" data-cmd="tsina" title="Share to Sina Wei Bo"></a> <a href="#" class="bds_weixin" data-cmd="weixin" title="Share to WeChat"></a> Share to: </ Div> <script>window._bd_share_config = { "common": { "bdSnsKey": {}, "bdText": "", "bdMini": "1", "bdMiniList": false, "bdPic": "", "bdStyle": "2", "bdSize": "16" }, "share": {} }; with (document) 0[(getElementsByTagName($

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Five methods for detecting heavy metal in tobacco and tobacco products - Master's thesis - Dissertation

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