王铜在人参和土壤中的残留量研究

Study on Residues of Copper Oxychloride in Panax ginseng and Soil

研究了人参和土壤中王铜的消解动态及最终残留量。样品加入浓硝酸和高氯酸加热,采用原子吸收光谱分析检测。消解动态试验结果表明,30%王铜悬浮剂有效成分用量为2 700 g/hm2时,王铜在人参和土壤中的半衰期分别为10.3 d和9.4 d。最终残留试验结果表明,当30%王铜悬浮剂有效成分用量为1 800～2 700 g/hm2,施药次数为1～2次,收获期人参和土壤中王铜的最终残留量分别为1.093 5～1.232 7 mg/kg和0.339 9～0.649 4 mg/kg。30%王铜悬浮剂用于防治人参黑斑病,最高有效成分用量为1 800 g/hm2,生长期最多施药2次,安全间隔期为28 d。建议王铜在人参（干）中的MRL值为50.0 mg/kg。

The residual decline and final residues of copper oxychloride 30% SC in Panax ginseng and soil were studied. The samples were heated in concentrated nitric acid and perchloric acid, then determined by atomic absorption spectroscopy. The dynamic degradation results showed that when the active ingredient dosage of copper oxychloride 30% SC was 2 700 g/hm2, the half-lives were 10.3 d and 9.4 d in Panax ginseng and soil, respectively. The final residue results showed that at the active ingredient dosages of 1 800-2 700 g/hm2, the final residues were 1.093 5-1.232 7 mg/kg and 0.339 9- 0.649 4 mg/kg. Copper oxychloride 30% SC could provide effect against Altemaria panax Whetz, the maximum active ingredient dosage was 1 800 g/hm2, and the maximum seasonal application rates were two, the post harvest interval was 28 d. The suggested MRL of copper oxychloride in Panax ginseng was 50.0 mg/kg. Key words： Panax ginseng; copper oxychloride; dynamic degradation; final residue; atomic absorption spectroscopy