1 Scope
This standard specifies GC-MS method for determination of 475 pesticides and related chemicals (see Appendix A) residues in barley, wheat, oats, rice and corn.
This standard is applicable to determination of 475 pesticides and related chemicals residues in barley, wheat, oats, rice and corn.
Method detection limit of this standard is 0.0025mg/kg~0.8000mg/kg (see Appendix A).
2 Normative References
The following standards contain provisions which, by reference in this text, constitute provisions of this standard. For dated reference, subsequent amendments to (excluding the corrected contents), or revisions of, any of these publications do not apply. However, parties to agreements based on this standard are encouraged to investigate the possibility of applying the most recent editions of the standards indicated below. For any undated references, the latest edition of the document referred to applies.
GB 5491 Inspection of Grain and Oilseeds - Methods for Sampling and Sample Reduction
GB/T 6379.1 Accuracy (Trueness and Precision) of Measurement Methods and Results - Part 1: General Principles and Definitions (GB/T 6379.1-2004, ISO 5725-1: 1994, IDT)
GB/T 6379.2 Accuracy (Trueness and Precision) of Measurement Methods and Results - Part 2: Basic Method for the Determination of Repeatability and Reproducibility of a Standard Measurement Method (GB/T 6379.2-2004, ISO 5725-2: 1994, IDT)
3 Principles
Extract the specimen with acetonitrile in accelerated solvent extractor, elute pesticides and related chemicals with acetonitrile + toluene (3+1) after the extract is purified through solid-phase extraction column, and detect them with GC-MS.
4 Reagents and Materials
4.1 Acetonitrile: chromatographically pure.
4.2 Infusorial earth: guaranteed reagent (GR).
4.3 Anhydrous sodium sulfate: analytical reagent. Prior to use, burn it at 650℃ for 4h, store it in dryer and cool it for standby.
4.4 Toluene: GR.
Foreword I
1 Scope
2 Normative References
3 Principles
4 Reagents and Materials
5 Apparatus
6 Specimen Preparation and Storage
8 Calculation of Results
9 Precision
Appendix A (Informative) Table on Method Detection Limit, Grouping, Solvent Selection and Concentration of Mixed Standard Solution for 475 Pesticides and Related Chemicals
Appendix B (Informative) Retention Time, Quantitative Ion, Qualitative Ion and Abundance Ratio of Quantitative Ion against Quantitative Ion for 475 Pesticides and Related Chemicals as well as Internal Standard Compounds
Appendix C (Informative) Grouping Table on Selected Ion Monitoring of Five Groups (A~E) of Pesticides and Related Chemicals
Appendix D (Informative) Selected Ion Monitoring GC-MS Figure of Standard in Wheat Matrix
Appendix E (Informative) Data Table on Precision of 475 Pesticides and Related Chemicals
Appendix F (Informative) Bilingual References of 475 Pesticides and Related Chemicals
