Drug residue detection in agricultural products

This section specifies the scope of vegetables and fruits, including dichlorvos, phorate, dimethoate, parathion, parathion, methyl parathion, chlorpyrifos, isocarbophos, ethion, quinethion, phoxim, trichlorfon, omethoate, phoxim, methylmidophos, malathion, phoxim, imidophos, methamidophos, diazinon, methyl poisoning of maidservants, cockroaches, parathion, chlorpyrifos, acephate, amifos, monocrotophos, and chlorpyrifos A gas chromatographic method for the detection of multiple residues of 54 organic phosphorus pesticides, including benthion, desmophos, chlorpyrifos, triazophos, thiocyclops, methylthiocyclops, Yimian, Baomian, fly poison, desmophos, sterilized phosphorus, ethylbromophos, probromophos, dibromophos, pyrifos, terbutafos, isocarbophos, fenvalerate, and chlorpyrifos. This section is applicable to the detection of 54 pesticide residues in vegetables and fruits. The detection limit of this method is: 0.01 mg/kg -0 3 mg/kg (see Appendix A)

2 Normative References: The clauses in the following documents become the clauses of this standard through reference in this standard. For dated references, All subsequent modification orders (excluding corrected content) or revised versions are not applicable to the wooden standard. However, all parties who have reached agreements based on this standard are encouraged to study whether the latest versions of these documents can be used. For undated reference documents, the latest version applies to this standard. GB/T 6379.2 Accuracy (Accuracy and Precision) of Measurement Methods and Results Part 2: Basic Methods for Determining the Repeatability and Reproducibility of Standard Measurement Methods (GB/T 6379.2-2004, TSO 5725-2:1994, IDT) GB/T 6682 Specification and Test Methods for Analytical Laboratory Water (GB/T 6682-1992, neq ISO 36961987) GB/T 8855: Sampling Methods for Fresh Fruits and Vegetables (GB/T 8855-1988, eqv ISO 8741980) 3 Principle: The organic phosphorus pesticides in the sample are extracted with acetonitrile, the extracted solution is filtered, concentrated, and then diluted with acetone. They are simultaneously injected into two injection ports of the gas chromatograph using a dual automatic sampler, The pesticide components were separated by two capillary columns with different polarities and detected by a flame photometric detector (FPD phosphorus filter). Qualitative analysis using double column retention time and quantitative analysis using external standard method. Unless otherwise specified, only reagents confirmed as analytically pure and at least Grade II water specified in GB/T 6682 shall be used in the analysis. 4.1 Acetonitrile. 4.2 Acetone, steam again. 4.3 Sodium chloride, bake at 140 ℃ for 4 hours. 4.4 Filter membrane, 0.2 um, organic solvent membrane. 4.5 Aluminum box. 1

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