Pesticide residue parameter 222716 detection

The organic phosphorus pesticides in the principle sample are extracted with acetonitrile, the extracted solution is filtered, concentrated, and then diluted with acetone. They are simultaneously injected into the two injection ports of the gas chromatograph using a dual automatic sampler. The pesticide components are 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

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