氯氰菊酯在苹果及土壤中的残留动态研究

用带电子捕获检测器的 GC-9A 气相色谱仪测定了氯氰菊酯(cype-rmethrin)在苹果和土壤中的残留量和消解动态。两年的试验结果表明,氯氰菊酯在苹果和土壤中的消解速度是相当慢的。氯氰菊酯在苹果和土壤中的半衰期分别为9天和12天。在整个水果生长期,使用氯氰菊酯25ppm 和50ppm 喷施2-4次,最后一次施药距采收间隔期为56-25天,氯氰菊酯在苹果中的残留量分别为0.0335-0.0968ppm 和0.1058-0.2300Ppm,而土壤中氯氰菊酯的残留量低于最小检出浓度。施药浓度为100ppm 使用2-4次时,最后一次施药距采收间隔为25天,氯菊氰酯在苹果和土壤中的残留量分别为0.2967ppm 和0.233ppmm。

STUDIES ON THE RESIDUE AND DISSIPATION OF CYPERMTHRIN ON THE APPLES

GC-9A equipped with ECD detector was used to measure residue and degradation of Cypermethrin in apple and soil. The experimental results of two years in one place show:The degra- dation's speed of Cypermethrin in apple and soil was relative slow The halfsimes of Cypermethrin jn apple and soil were 9 and 21 days respectively,when 25 ppm and 50 ppm Cypermethrin were applied 2 to 4 times during the whole growing period of the fruit,and the pre-harve- st intervaI of the last application was 56 to 25 days,the re...