Measuring method for quickly measuring contents of heavy metals in tobacco by using microwave digestion/ICP-MS method

Abstract

The invention discloses a measuring method for quickly measuring the contents of heavy metals in tobacco by using a microwave digestion / ICP-MS (Inductively Coupled Plasma Mass Spectrometry) method. According to the measuring method, a microwave digestion pretreatment method is adopted, an ICP-MS is adopted to measure the contents of arsenic, plumbum, cadmium, chromium, copper, zinc, nickel and mercury elements in a digestion liquid, 75As, 208Pb, 111Cd, 53Cr, 63Cu, 66Zn, 60Ni and 202Hg are selected as mass numbers of the to-be-measured elements to reduce mass spectrum interference, and an internal standard element Rh is added in an off-line manner to inhibit the matrix effect. For to-be-measured ions with a certain mass-to-charge ratio, mass spectrum signal response is directly proportional to the number of ions entering the ICP-MS, the concentration of the elements in a sample is measured by measuring the number of mass spectrum signals, and the contents of the elements are calculated by a standard curve method. The method is quick and simple, can efficiently and accurately measure the contents of heavy metals in tobacco and tobacco products, and provides an effective scheme for finding out the content level of heavy metals in cigarettes in China to reduce harm to human health.

Description

technical field [0001] The invention relates to a rapid detection method for heavy metals in tobacco and tobacco products, especially for the detection of As, Pb, Cd, Cr, Cu, Zn, Ni, Hg and other heavy metals in tobacco by using microwave digestion-inductively coupled plasma mass spectrometry detection technology. method of measurement. Background technique [0002] At present, the detection methods related to the content of heavy metals in tobacco in domestic and foreign literature mainly include: atomic fluorescence spectrometry, atomic absorption spectrometry, inductively coupled plasma method, spectrophotometry, liquid chromatography, neutron activation method, inductively coupled Plasma mass spectrometry (ICP-MS method), etc. Compared with other methods, the ICP-MS method has the following advantages: (1) It can simultaneously measure multiple elements at one time, which shortens the time and greatly improves the work efficiency; (2) The detection limit is low, and mos...

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Problems solved by technology

[0005] In recent years, the impact of heavy metal content in tobacco on human health has attracted more and more attention in China. However, the level of heavy metal content in many domestic tobaccos is still unknown, and there is a lack of an efficient and unified standard method to detect heavy metals in tobacco. There are few research reports on the determination methods of heavy metals in tobacco

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