硫丹（endosulfan）在苹果和土壤中的残留动态研究

用带电子捕获检测器的气相色谱仪测定了硫丹在苹果和土壤中的残留及消解动态。两年两地的试验结果表明，硫丹在苹果中消解快，但在土壤中消解相当慢；硫丹在苹果和土壤中的半衰期为２．１￣２．３ｄ和１５￣２６ｄ。在整个苹果生长期，使用硫丹１７５ｍｇ·Ｌ＾－１和３５０ｍｇ·Ｌ＾－１喷雾２次、３次，最后１次施药距采收间隔期为１５￣３０ｄ，硫丹在苹果中的残留量低于最大残留限量。

Analysis for the Dynamic Situation of Endosulfan Residue in Apple and Soil

GC-ECD was used to measure residue and degradation of endosulfan in apple and soil. The results obtained from two years experiments showed that the degradation of endosulfan in apple was fast, but in soil was-relatively much more slow. Its half livies in apple and soil were 2. 1 ~2. 3 days and 15~26 days respectively. When endosulfan was sprayed two or three times with the dosage of 175 mg .L-1 and 350 mg. L-1 during the whole growing season of fruit trees, and the last application was carried out 15~30 days be fore the harvest, the residue of endosulfan in apple and soil was below the maximum residue limit at the harvest time.