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Method for determining copper in tobacco or tobacco products by using continuous flow method

A technology of tobacco products and flow method, which is applied in the field of tobacco and can solve the problems of low sensitivity, expensive detection instruments, time-consuming and cumbersome pretreatment, etc.

Pending Publication Date: 2020-07-07
CHINA TOBACCO GUIZHOU IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, most of these methods have the disadvantages of time-consuming and cumbersome pretreatment, expensive detection instruments, and low sensitivity.

Method used

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  • Method for determining copper in tobacco or tobacco products by using continuous flow method
  • Method for determining copper in tobacco or tobacco products by using continuous flow method
  • Method for determining copper in tobacco or tobacco products by using continuous flow method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0069] Please refer to figure 1 , the embodiment of the present invention provides a kind of method for measuring copper in the tobacco leaf sample by continuous flow method, comprising the following steps:

[0070] Moisture was determined by the oven method (YC / T 31), and the copper content of the different tobacco leaf samples was determined by continuous flow analysis.

[0071] 1) Sample pretreatment:

[0072] Tobacco leaf samples were ground and passed through a 0.45 mm sieve (40 mesh), and their moisture content was determined. Accurately weigh 1 g of tobacco leaf sample (accurate to 0.1 mg), place it in a 100 mL Erlenmeyer flask with a stopper, and add 100 ml of 0.01 mol / L HCl solution. Cover with a stopper, extract by mechanical shaking at room temperature for 0.5 h, after standing still, filter the extract with Whatman No. 40 filter paper, and collect the filtrate in the sample cup.

[0073] 2) Preparation of reaction reagents:

[0074] R1 solution: The pH of R1 so...

Embodiment 2

[0100] Embodiments of the present invention provide a method for measuring copper in cut tobacco samples of finished cigarettes by continuous flow method, comprising the following steps:

[0101] 1) Sample pretreatment:

[0102] The shredded tobacco in the finished cigarette sample was ground and passed through a 0.45mm sieve (40 mesh) to determine its moisture content. Accurately weigh 1 g of the sample (accurate to 0.1 mg), place it in a 100 mL Erlenmeyer flask with a stopper, and add 100 ml of 0.01 mol / L HCl solution. Cover with a stopper, extract by mechanical shaking at room temperature for 0.5 h, after standing still, filter the extract with Whatman No. 40 filter paper, collect the filtrate in the sample cup for analysis.

[0103] 2) The preparation of reaction reagent and working standard solution is the same as in Example 1.

[0104] 3) Determination of actual samples:

[0105] Adopt continuous flow analysis, and the determination method and standard curve of embodi...

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Abstract

The invention relates to the technical field of tobaccos, in particular to a method for determining copper in tobaccos or tobacco products by using a continuous flow method. The detection method disclosed by the invention comprises the following steps: under the condition that the PH value is 4.6 to 4.8: reacting 3, 5-Di-Br-PAESA with copper of tobacco or tobacco products to generate a stable compound, determining the absorbance of the stable compound at 580 nm, and calculating the concentration of copper in the extraction filtrate of tobacco or tobacco products through a predetermined standard curve. The detection method provided by the invention can fill the gap that no method for determining copper in tobacco or tobacco products by adopting a continuous flow method exists in the prior art.

Description

technical field [0001] The invention relates to the technical field of tobacco, in particular to a method for measuring copper in tobacco or tobacco products by a continuous flow method. Background technique [0002] Tobacco chemistry research has carried out qualitative analysis on thousands of compounds in tobacco leaves and smoke, and there are more and more requirements for quantitative analysis of chemical components in tobacco and tobacco products, including the update and improvement of analytical methods , the improvement of analysis efficiency, and the gradual modernization of analysis methods. This is an important basic work for the stability and development of cigarettes. The chemical composition of tobacco or tobacco products has a great influence on the quality of tobacco leaves and the sensory quality of cigarettes. At present, the quantitative analysis of conventional chemical indicators in tobacco or tobacco products includes total sugar, reducing sugar, to...

Claims

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Application Information

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IPC IPC(8): G01N21/31
CPCG01N21/31
Inventor 赵杨叶冲刘科乾何军韩伟
Owner CHINA TOBACCO GUIZHOU IND
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