1 Scope
This standard specifies gas chromatography-mass spectrometry (hereinafter referred to GC-MS) for determination of 475 pesticides and related chemicals (see Annex A) residues in barley, wheat, oat, rice and corn.
This standard is applicable to determination of 475 pesticides and related chemicals residues in barley, wheat, oat, rice and corn. Other grains and foods may also refer to the provisions of this standard.
2 Normative References
The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
GB 2763 National Food Safety Standard - Maximum Residue Limits for Pesticides in Food
GB/T 6682 Water for Analytical Laboratory Use - Specification and Test Methods
3 Principle
Extract the sample with acetonitrile in accelerated solvent extractor, then elute pesticides and related chemicals with acetonitrile-toluene solution (3+1) after the extracting solution is purified through solid-phase extraction column, and detect it with GC-MS.
Foreword i
1 Scope
2 Normative References
3 Principle
4 Reagents and Materials
5 Apparatuses
6 Sample Preparation and Preservation
7 Analytical Procedures
8 Result Calculation and Expression
9 Precision
10 Limit of Quantitation and Recovery Rate
Annex A (Informative) Limit of Quantitation, Grouping, Solvent Selection and Concentration of Mixed Standard Solution for 475 Pesticides and Related Chemicals
Annex B (Informative) Retention Time, Quantitative Ion, Qualitative Ion and Abundance Ratio of Quantitative Ion to Quantitative Ion for 475 Pesticides and Related Chemicals as well as Internal Standard Compounds
Annex C (Informative) Grouping Table Regarding Selected Ion Monitoring of Five Groups (A~E) of Pesticides and Related Chemicals
Annex D (Informative) GC-MS Figure for Selected Ion Monitoring of Standard Substances in Wheat Matrix
Annex E (Informative) Repeatability Requirements in Laboratory
Annex F (Informative) Repeatability Requirements between Laboratories
Annex G (Informative) Test Data for the Addition Concentration and Recovery Rate of Sample