关键词: 饮用水, 有机氯农药, 膜固相萃取, 加标回收-质控图

Abstract: Objective To establish a method for the determination oforganochlorine pesticides,including hexachlorobenzene,α-HCH,γ-HCH,heptachlor,β-HCH,δ-HCH,p,p'-DDE,o,p'-DDT,p,p'-DDD and p,p'-DDT,by using disk solid phase extraction-gas chromatography,evaluate with recovery rate-quality control chart to ensure the quality level of testing. Methods 1 L drinking water sample was enriched by using a 47 mm C18 solid-phase extraction membrane,and methylene chloride and ethyl acetate were used for elution,and the constant volume was 1 mL. The hexachlorobenzene,α-HCH,γ-HCH,heptachlor,β-HCH,δ-HCH,p,p'-DDE,o,p'-DDT,p,p'-DDD and p,p'-DDT were separated by temperature programming with chromatographic column VF-1 701 ms,and electron capture detector was used to collect data. The quantitation was carried out by the external standard method. Results 10 kinds of organochlorine pesticides showed the good linearity in 10-100 μg/L,and the correlation coefficientswere >0.998 8. The limits of detectionwere 3-5 ng/L. The average recoveries ranged from 87.7% to 116.0% for low,medium,and high concentrations,and the relative standard deviations were 8.3%-15.4%. The center lines of recovery rate-quality control chart（n=20） ranged from 91.8% to 115.3%,and standard deviations（s） were in the range of 11.5%-14.1%. Conclusion This method is simple,quick,and widely used in drinking water monitoring,and the recovery rate-quality control chart can improve the quality of inspection.

Key words: Drinking water, Organochlorine pesticide, Disk solid phase extraction, Recovery rate-quality control chart