Department of Bio-Environmental Chemistry, Chungnam National University, 220 Kungdong Yusungku, Daejeon, 305-764, Republic of Korea.
Bull Environ Contam Toxicol. 2011 Dec;87(6):649-52. doi: 10.1007/s00128-011-0407-8. Epub 2011 Sep 16.
Residues of the polar pesticide pymetrozine were compared using two methods: hydromatrix and liquid-liquid extraction (LLE). The biological half-life and the final residue level were investigated using Aster scaber over a 10-days cultivation period. The respective biological half-lives of the pesticide were 4.2 and 3.5 days at the recommended and double dose. The final residue levels were 1.28 and 1.98 mg kg(-1), respectively, at the same application rate of pymetrozine according to the GAP standard of the United Kingdom. Average recovery was higher with LLE than with the hydromatrix method. Dissipation curves of pymetrozine were influenced by the application amount and growth rate of A. scaber. The final residue level of pymetrozine could be predicted to be lower than the UK maximum residue limit for lettuce applying the GAP standard.
采用水基质法和液-液萃取法（LLE）比较了极性杀虫剂吡虫啉的残留情况。使用 Aster scaber 在 10 天的培养期内研究了农药的生物半衰期和最终残留水平。在推荐剂量和双倍剂量下，农药的生物半衰期分别为 4.2 和 3.5 天。根据英国 GAP 标准，以相同的吡虫啉施用量，最终残留水平分别为 1.28 和 1.98 mg kg(-1)。与水基质法相比，LLE 的平均回收率更高。吡虫啉的消解曲线受 Aster scaber 的施用量和生长速度的影响。根据 GAP 标准，应用于生菜时，吡虫啉的最终残留水平预计低于英国最大残留限量。
