College of Science, China Agricultural University, Beijing 100193, PR China.
Ecotoxicol Environ Saf. 2011 Sep;74(6):1653-8. doi: 10.1016/j.ecoenv.2011.05.004. Epub 2011 May 24.
The dissipation of metaldehyde on cabbage and in soil was studied and half-life (DT(50)) was estimated in a field study carried out at three different locations. Metaldehyde was sprayed on cabbage at 937.5 and 1406.25 ga.i.ha(-1) for residue study and 1,875 ga.i.ha(-1) for dissipation study in cabbage and soil. Samples of cabbage and soil for dissipation experiment were collected at 0, 1, 2, 3, 5, 7, 14 and 21 days after treatment. For residue studies, cabbage and soil samples were sampled at 5, 7 and 10 days after treatment. Quantification of residues was done by LC-MS/MS. The DT(50) of metaldehyde in cabbage and soil were 0.48-1.61 days and 0.75-1.02 days, respectively, when applied at 2 times of the recommended high dosage. Residues of metaldehyde in cabbage were all below the maximum residue levels of 1.0 mg kg(-1) at both recommended high dosage and 1.5 times the recommended high dosage.
在三个不同地点进行的田间研究中，研究了灭多威在甘蓝和土壤中的消解情况，并估算了半衰期（DT（50））。灭多威以 937.5 和 1406.25ga.i.ha（-1）的剂量用于残留研究，以 1875ga.i.ha（-1）的剂量用于甘蓝和土壤中的消解研究。消解试验中，在施药后 0、1、2、3、5、7、14 和 21 天采集甘蓝和土壤样品。残留研究中，在施药后 5、7 和 10 天采集甘蓝和土壤样品。通过 LC-MS/MS 定量残留。当以推荐高剂量的 2 倍施用时，灭多威在甘蓝和土壤中的 DT（50）分别为 0.48-1.61 天和 0.75-1.02 天。在推荐高剂量和推荐高剂量的 1.5 倍时，甘蓝中的灭多威残留均低于 1.0mgkg（-1）的最大残留限量。
