地表水中有机磷农残测定的前处理方法比较

Comparison of pretreatment methods for determining organophosphorous pesticide residues in surface water

分别采用液液萃取法和固相萃取法提取地表水样品中的有机磷农药残留.液液萃取法的方法检出限为0.05 ～0.2 ng/mL,加标回收率为86％～103％,相对标准偏差为2％～7％;固相萃取法的方法检出限为0.03～0.05 ng/mL,加标回收率为49％～ 118％,相对标准偏差为5％～18％.液液萃取法处理不同类型基体水样的测试稳定性较好,固相萃取法则对于洁净环境水体中痕量有机磷农药残留的富集更为适用.

Organophosphorous pesticides were extracted from surface water with liquid-liquid extraction （LLE） and solid-phase extraction （SPE） respectively. The limits of detection LLE were 0.05-0.2 ng/mL. And recoveries and relative standard deviations of spiked samples of LLE were 86%-103% and 2%-7%. Limits of detection SPE were 0.03-0.05 ng/mL. And recoveries and relative standard deviations of spiked samples of SPE were 49%-118% and 5%-18%. LLE method was suitable for determining trace organophosphorous pesticide residues in water samples with different matrix, while SPE was suitable for clean environmental water samples.