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A method for the determination of chromium, nickel, arsenic, selenium, cadmium and lead in snus

A measurement method, the technology of snus, which is applied in the field of chemical analysis and detection, can solve the problems that the measurement cannot be realized at the same time, and the processing and operation are cumbersome.

Active Publication Date: 2018-12-14
SHANGHAI TOBACCO GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the detection methods in these standards mainly include graphite furnace atomic absorption spectrometry, hydride atomic fluorescence spectrometry, colorimetry, and single-scan polarography. Determination of selenium, cadmium and lead content, and so far there is no relevant test to prove whether these methods are suitable for the determination of chromium, nickel, arsenic, selenium, cadmium and lead in snus

Method used

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  • A method for the determination of chromium, nickel, arsenic, selenium, cadmium and lead in snus
  • A method for the determination of chromium, nickel, arsenic, selenium, cadmium and lead in snus
  • A method for the determination of chromium, nickel, arsenic, selenium, cadmium and lead in snus

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Effect test

Embodiment 1

[0058] 1. Measurement method

[0059] 1.1 Sample pretreatment

[0060] Accurately weigh the snus sample and place it in a microwave digestion tank with an accuracy of 0.1 mg, and then add the digestion agent into the microwave digestion tank. Wherein, the solid-liquid ratio of the added weight of the snus sample to the added volume of the digestion agent is: 0.03-0.15:1 (g / ml). The digestion agent is a mixed aqueous solution of nitric acid, hydrogen peroxide and hydrofluoric acid, specifically 5-12ml 60-65% nitric acid, 2-6ml 20-30% hydrogen peroxide, 1ml 30-40% hydrofluoric acid, preferably 5-10ml 65% nitric acid, 2-4ml 30% hydrogen peroxide, 1ml 40% hydrofluoric acid. Seal the digestion tank and place it in a microwave digestion instrument.

[0061] Set the heating program for the microwave digestion method, specifically: the initial temperature is room temperature (20-25°C), rise to 90-110°C with a heating time of 4-6min, and keep for 4-6min; then use a heating time of 4...

Embodiment 2

[0075] 1. Measurement method

[0076] 1.1 Sample pretreatment

[0077] Accurately weigh the snus sample and place it in a microwave digestion tank with an accuracy of 0.1 mg, and then add the digestion agent into the microwave digestion tank. Wherein, the solid-liquid ratio of the added weight of the snus sample to the added volume of the digestion agent is: 0.04-0.07:1 (g / ml). The digestion agent is a mixed aqueous solution of nitric acid, hydrogen peroxide, and hydrofluoric acid, specifically 5ml of 65% nitric acid, 2ml of 30% hydrogen peroxide, and 0.5ml of 40% hydrofluoric acid, which are placed in a microwave digestion apparatus.

[0078] Set the heating program for the microwave digestion method, specifically: the initial temperature is room temperature (20-25°C), and the temperature is raised to 100°C with a heating time of 5 minutes, and kept for 5 minutes; then raised to 130°C with a heating time of 5 minutes, and kept for 5 minutes; Then raise the temperature to 16...

Embodiment 3

[0096] 1. Results and discussion

[0097] 1.1 Selection of digestion solution

[0098] Add snus samples to the blank solution, respectively choose digestion agent 1: 65% nitric acid, 30% hydrogen peroxide, 40% hydrofluoric acid (volume ratio is 10:4:1); digestion agent 2: 65% nitric acid , 30% hydrogen peroxide (volume ratio 5:2); digestion agent 3: 65% nitric acid, 30% hydrogen peroxide, 35% hydrochloric acid (volume ratio 5:2:1). Perform microwave digestion according to the conditions specified in 1.1 of Example 2, and cool, transfer, and constant volume to obtain a sample solution. At the same time, a blank experiment was carried out according to the conditions specified in 1.1 of Example 2 to obtain a blank solution. According to the standard solution and the internal standard solution of 1.2 in Example 2, finally use ICP-MS to detect respectively. From the comparison in Table 4, it can be seen that when the digestion agent 1 is selected, the detection results of the si...

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Abstract

The invention provides a method for determining chromium, nickel, arsenic, selenium, cadmium and lead elements in snus, which comprises the following steps: 1) Sample pretreatment: weighing snus samples, and digesting them by microwave digestion method, Then cool, transfer, and constant volume to obtain the sample solution; 2) Preparation of standard solution: prepare germanium 72, indium 115, bismuth 209 internal standard solution and chromium, nickel, arsenic, selenium, cadmium, lead element standard solution; 3) The sample solution, standard solution and internal standard solution were detected by inductively coupled plasma mass spectrometry, and the internal standard synchronization standard curve method was used for quantification to obtain the contents of chromium, nickel, arsenic, selenium, cadmium and lead in the sample solution. The method for determining chromium, nickel, arsenic, selenium, cadmium, and lead in snus provided by the present invention has good correlation coefficient, recovery rate and repeatability, and is beneficial for relevant technicians in the tobacco industry to identify six kinds of heavy metals in snus Effective quantitative determination and control of element content.

Description

technical field [0001] The invention belongs to the technical field of chemical analysis and detection, and in particular relates to a method for determining chromium, nickel, arsenic, selenium, cadmium and lead elements in snus. Background technique [0002] Chromium, nickel, arsenic, selenium, cadmium, and lead are common heavy metal elements, and are also harmful components listed in the Hoffmann list in the tobacco industry. In recent years, they have received extensive attention due to their greater harm to humans and the environment. and research. Snus is a new type of smokeless tobacco product made by mixing tobacco powder with an appropriate amount of flavoring substances, salt (sodium chloride), water, humectant, and buffer agent (sodium carbonate) through heat treatment. When snus is taken, the snus is directly put into the human mouth, and the chromium, nickel, arsenic, selenium, cadmium, and lead elements in its raw materials and packaging materials will be abso...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N27/62G01N1/44G01N27/626
CPCG01N1/44G01N27/62
Inventor 陆怡峰李永霞张珲姿姚鹤鸣顾文博刘鸿张怡春
Owner SHANGHAI TOBACCO GRP CO LTD
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