o. P '- DDT detection

1. Scope: This standard specifies the determination method for 16 organochlorine and pyrethroid pesticide residues in grains and vegetables (see Table 1 for 16 pesticides); Method for determining 40 organic ammonia and pyrethroid pesticide residues in fruits and vegetables (see Table A.1 for 40 pesticides); Method for the determination of 40 organochlorine pesticides and pyrethroid pesticide residues in concentrated fruit juice (see Appendix B for 40 pesticides). This standard is applicable to the determination of 16 organochlorine and pyrethroid pesticide residues in grains and vegetables; Determination of 40 organochlorine and pyrethroid pesticide residues in broccoli, chrysanthemum, scallions, celery, tomatoes, cucumbers, spinach, citrus, apples, and strawberries; Determination of 40 organochlorine pesticides and pyrethroid pesticide residues in concentrated fruit juice. The detection limits of 16 organochlorine and pyrethroid pesticide residues in grains and vegetables are shown in Table 2; The quantitative limits of the determination methods for 40 organochlorine and pyrethroid pesticide residues in fruits and vegetables are shown in Table C.1; The detection limit and quantification limit of 40 organochlorine pesticides and pyrethroid pesticide residues in concentrated fruit juice are shown in Table B.2.2. Determination of 16 organochlorine and pyrethroid pesticide residues in grains and vegetables 2.1 Principle: The organochlorine and pyrethroid pesticide residues in the sample are extracted with organic solvents. After liquid-liquid distribution and chromatography purification, the interfering substances are removed, and detected with an electron capture detector. Qualitative analysis is carried out based on the retention time of the chromatographic peak, Quantitative analysis using external standard method. 2.2 Reagents and materials. Unless otherwise specified, only reagents and distilled water or water of equivalent purity determined to be analytically pure shall be used in the analysis. 2.2.1 Petroleum ether: Boiling range 60 C~90 C. Re steam. 2.2.2 Benzene: heavy steaming. 2.2.3 Acetone: re evaporate. 2.2.4 Ethyl acetate: steam again. 2.2.5 Anhydrous sodium sulfate. 2.2.6 Flori silica: for chromatography, burn at 620 ° C for 4 hours before use. Bake at 140 ° C for 2 hours before use. Inactivate with 5% water while hot

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