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.
GB/T 19649-2006 The following standards are cited：
