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Medium acidity control mathematical model for determining lead by using atomic fluorescence method

A technology of acidity control and mathematical model, which is applied in the direction of chemiluminescence/bioluminescence, and analysis by making materials undergo chemical reactions, which can solve problems such as difficulty in controlling the acidity of the reaction medium and inaccurate test results.

Inactive Publication Date: 2012-09-19
ZHEJIANG ACADEMY OF AGRICULTURE SCIENCES
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The purpose of the present invention is to measure the technical defect of lead content in the existing atomic fluorescence method, that is: because it is difficult to control the acidity of the reaction medium, the test result is often inaccurate

Method used

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  • Medium acidity control mathematical model for determining lead by using atomic fluorescence method
  • Medium acidity control mathematical model for determining lead by using atomic fluorescence method
  • Medium acidity control mathematical model for determining lead by using atomic fluorescence method

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Embodiment

[0063] In order to verify the practical application value of this model, we tested the lead in the 2010 international FAPAS (Phopass) proficiency testing sample (paprika, No. content was measured. The conditions of Series 2 in Table 1 are adopted, that is, when the volume fraction of hydrochloric acid in the specified sample and the carrier flow is 1.5% (A=a=1.5), and the mass concentration of the reducing agent potassium borohydride is 10g L -1 (b=10), according to the formula (8), it can be calculated that the mass concentration of potassium hydroxide in the reducing agent is C=14.7. That is, the reducing agent is dissolved in 14.7g·L -1 In potassium hydroxide solution, the concentration is 10g L -1 solution of potassium borohydride.

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Abstract

The invention discloses a medium acidity control mathematical model for determining lead by using an atomic fluorescence method, belonging to the technical field of testing. A mathematical model invented on the basis of a mechanism on lead tetrahydride and a study on factors affecting the pH (Potential Of Hydrogen) is as shown in the attached formula, in the formula, V0 represents the constant volume (mL) of a sample, V4 represents the volume (mL) of oxalic acid adding in the sample, Ka1 represents a primary dissociation constant of the oxalic acid, which is 5.9*10<-2>, c represents the amount-of-substance concentration (mol.L<-1>) of the oxalic acid, A represents the volume fraction (%) of hydrochloric acid in a carrying current, a represents the volume fraction (%) of the hydrochloric acid in the sample, C represents the mass concentration (g.L<-1>) of potassium hydroxide, b represents the mass concentration (g.L<-1>) of potassium borohydride, V1 represents the injection volume (mL) of the carrying current, V2 represents the injection volume (mL) of the sample, and V3 represents the injection volume (mL) of a reducing agent.

Description

technical field [0001] The invention relates to the technical field of testing, in particular to establishing a mathematical model suitable for controlling the acidity of a reaction medium when the atomic fluorescence method is used to measure lead. Background technique [0002] Since 1974 Thompson and Thomerson [Ian D.Brindle, Roger McLaughlin, Napa Tangtreamjitmun. Determination of lead in calcium carbonate by flow-injectionhydride generation with dc plasma atomic emission detection. Spectrochimica ActaPart B.1998, 53:1121-1129] first reported NaBH 1 Reduction of Pb in hydrochloric acid medium 2+ Since plumbane was obtained, people have been studying and using this technology to determine lead. Chen Hengwu and others systematically summarized and summarized the relevant research [Chen Hengwu, Qi Wenbin, Progress in the determination of lead by hydride generation method. Spectroscopy and Spectral Analysis, 1994, 14(2): 113-120]. Has been formed by HCl-K 3 Fe(CN) 6 -KB...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/76
Inventor 张永志王钢军叶雪珠赵首萍于国光
Owner ZHEJIANG ACADEMY OF AGRICULTURE SCIENCES