环境样品中乙草胺和丁草胺的残留分析

Analysis of acetochlor and butachlor residues in environmental samples.

用丙酮水(V/V,80/20)以超声波提取后,经水-石油醚液液分配定容后,用液相色谱紫外检测器(LC-UV)测定水、土壤和作物中乙草胺和丁草胺的残留量.测得环境样品中乙草胺和丁草胺的添加回收率分别为87.7%~90.1%和87.5%~90.7%,相对标准偏差(R.S.D.)分别为2.4%~6.3%和4.3%~7.1%.在作物和土壤中乙草胺和丁草胺的最低检测浓度分别为0.015和0.037mg/kg,在水中分别为0.004和0.009mg/L.利用该方法检测了北京市京密引水渠流域的环境样品,河水中没有检出乙草胺和丁草胺;在乙草胺和丁草胺施用1个月后,土壤中乙草胺和丁草胺的残留低于或接近最低检测限.

The residues of acetochlor and butachlor in environmental samples (water, soil and crop) were determined with LC-UV detector after the samples were extra with ultrasonic wave using acetone-water (V/V,80/20) and the extracts were partitioned between petroleum ether and water. The spiked recoveries for acetochlor and butachlor were 87.7% [similar to] 90.1% and 87.5% [similar to] 90.7% respectively; and the relative standard deviations (R.S.D.) of recoveries were 2.4% [similar to] 6.3% and 4.3% [similar to] 7.1% respectively. The lowest detection concentration for acetochlor and butachlor was 0.015 and 0.037 mg/kg respectively in soil and crop samples, and 0.004 and 0.009 mg/L respectively in water samples. Acetochlor and butachlor were not detected in river water from Jingmi Canal on the north of Beijing. One month after acetochlor and butachlor were applied, their residues in soil were approaching to or lower than the lowest detection limit.