毒死蜱在人参和土壤中的残留量及其消解动态研究

Study on residual decline dynamics of Chlorpyrifos in Panax ginseng and soil

为了解吉林长白山人参及土壤中毒死蜱的消解动态,利用建立的液相色谱串联质谱(LC-MS/MS)法检测了抚松、集安两地人参和土壤中毒死蜱的残留量,制订了该农药田间使用规程。结果表明,在以质量浓度为0.01、0.02、0.20 mg/kg毒死蜱的添加回收率试验中,人参鲜根和土壤中平均回收率分别为81.00%~90.40%,87.48%~93.20%,变异系数分别为7.05%~9.64%,7.32%~10.35%。残留动态试验结果显示,当施用有效成分量为4 500g/hm^2时,人参鲜根和土壤的半衰期分别为12.2~15.2 d和15.6~22.8 d。建议将毒死蜱在人参中的最大残留限量定为0.10 mg/kg。当田间使用45%毒死蜱EC有效成分用量为2 600~4 500 g/hm^2时,人参的安全间隔期为60 d。

To study residual decline dynamics, residual of chlorpyrifos in soil and Panax ginseng collected in Fusong and Jian of Jilin province was determined by establishment of liquid chromatograph mass spectrometry （LC-MS/MS） and guide for chlorpyrifos usage was formulated. The results Showed that average recoveries of P. ginseng fresh root and soil at chlor- pyrifos concentration of 0.01, 0.02, 0.20 mg/kg were 81.00%-90.40% and 87.48%-93.20% with chlorpyrifos concentra- tions of 7.05%-9.64% and 7.32%-10.35%, respectively. Half-lives of phoxim of P. ginseng and soil were 12.2-15.2 days and 15.6-22.8 days with sprayed dose of 4 500 g/hm^2. It was recommended that MRL of 45% chlorpyrifos EC might be 0.10 mg/kg and pre-harvest interval was 60 d with sprayed dosage of 2 600-4 500 g/hm^2.