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GB/T 23376-2009 English PDF

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GB/T 23376-2009: Determination of pesticides residues in tea -- GC/MS method
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Basic data

Standard ID GB/T 23376-2009 (GB/T23376-2009)
Description (Translated English) Determination of pesticides residues in tea -- GC/MS method
Sector / Industry National Standard (Recommended)
Classification of Chinese Standard X04
Classification of International Standard 67.050
Word Count Estimation 15,143
Date of Issue 2009-04-08
Date of Implementation 2009-05-01
Quoted Standard GB/T 6379.1; GB/T 6379.2
Regulation (derived from) National Standard Approval Announcement 2009 No.3 (Total No.143)
Issuing agency(ies) General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China, Standardization Administration of the People's Republic of China
Summary This standard specifies the tea organic phosphorus, organic chlorine, pyrethroids and other categories 36 kinds of pesticides (see Appendix A) residues by gas chromatography/mass spectrometry. This standard applies to tea organophosphorus, determination of pyrethroids and other categories of 36 kinds of pesticide residues, organic chlorine. This standard method detection limit: See Appendix A.

GB/T 23376-2009: Determination of pesticides residues in tea -- GC/MS method

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Determination of pesticides residues in tea. GC/MS method ICS 67.050 X04 National Standards of People's Republic of China Determination of pesticide residues in tea more Gas Chromatography/Mass Spectrometry Posted 2009-04-08 2009-05-01 implementation Administration of Quality Supervision, Inspection and Quarantine of People's Republic of China Standardization Administration of China released

Table of Contents

Preface Ⅰ 1 Scope 1 2 Normative references 1 3 Principle 1 4 Reagents and materials 1 5. Apparatus 1 6 measuring step 2 6.1 Extraction 2 6.2 Purification 2 6.3 Determination of 2 6.4 Blank Experiment 3 7 3 Calculation Results 8 Precision 3 Appendix A (normative) 36 pesticides in the English name, the method detection limit 6 Retention time Annex B (informative) 36 pesticides quantitative ions, ion qualitative and quantitative and qualitative ion ion Abundance ratios Table 8 Annex C (informative) 36 pesticides selected ion monitoring packet table 10 and selected ion Annex D (informative) 36 pesticides reference materials selected ion monitoring the total ion current in the tea matrix 11

Foreword

Appendix A of this standard is a normative appendix, Appendix B, Appendix C, Appendix D is an informative annex. The standard proposed by the Anhui Provincial Quality and Technical Supervision. The standard by the China National Institute of Standardization. This standard was drafted. National Agricultural Processed Food Quality Supervision and Inspection Center, Anhui national agricultural standardization and monitoring center. The main drafters of this standard. Toshiki Jiang, Zhao Chengshi, Shu Yong, Caixia, Chen Honglin, Liuqin Fang, Zhao Bin. Determination of pesticide residues in tea more Gas Chromatography/Mass Spectrometry

1 Scope

This standard specifies the tea organophosphate, organochlorine, pyrethroids and other categories 36 kinds of pesticides (see Appendix A) Residual Gas Chromatography / Mass spectrometry. This standard applies to the determination of organic phosphorus, organic chlorine, and other categories 36 kinds of pyrethroid pesticide residues in tea. The standard method detection limits. See Appendix A.

2 Normative references

The following documents contain provisions which, through reference in this standard and become the standard terms. For dated references, subsequent Amendments (not including errata content) or revisions do not apply to this standard, however, encourage the parties to the agreement are based on research Whether the latest versions of these documents. For undated reference documents, the latest versions apply to this standard. GB/T 6379.1 measurement methods and results of Accuracy (trueness and precision) - Part 1. General principles and definitions GB/T 6379.2 measurement methods and results of Accuracy (trueness and precision) - Part 2. Determine the standard measurement method to repeat Of the basic methods of reproduction Principle 3 Tea sample organophosphate, organochlorine and pyrethroid pesticides were accelerated solvent extraction instrument (ASE) + acetonitrile dichloromethane (1 + 1, Volume ratio) and the extracts were dried after the solvent replacement by gel permeation chromatography (GPC) purified and concentrated by gas chromatography - mass spectrometer detection, Selected ion chromatographic retention time and qualitative, external standard.

4 Reagents and materials

Unless otherwise indicated, the reagents used were of analytical grade. 4.1 Cyclohexane. chromatography. 4.2 ethyl acetate. chromatography. 4.3 hexane. chromatographically pure. 4.4 The organic phase microporous membrane. pore size 0.45μm. 4.5 36 pesticides standard substance (purity greater than 98%). See Appendix A. 4.6 pesticide mixed standard stock solution. response sensitivity according to each pesticide on the instrument to determine its concentration in the mixed standard stock solution Degree shift take appropriate 100μg/mL single pesticide standard sample in 10mL volumetric flask, constant volume with n-hexane to prepare 36 kinds of pesticide mixed standard Quasi stock solution (stored at 4 ℃ in the dark, you can use a month). 4.7 matrix mixed standard working solution. Move the mixed standard stock solution of a certain volume of sample matrix blank extract after purification As a solvent to prepare a matrix mixed standard working solutions of different concentrations, used to make a standard curve. Matrix mixed standard working solution should now Service is used. 5. Apparatus 5.1 Gas chromatography - mass spectrometry. with electron impact ionization (EI). 5.2 Accelerated Solvent Extractor (ASE).

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