克线丹在甘蔗中的消解动态及残留安全性评价

Thc Decomposition Trends of Sebufos in Sugarcane and Its Residual Safety Evaluation

采用气相色谱分析克线丹在甘蔗中的残留量，方法准确度９２．７８％－９９．０３％，精密度标准差０．２１６６～１．８９３０ｍｇ／ｋｇ。最小检出量７．５７５８×１０－１０ｇ，最小检测浓度０．００６１ｍｇ／ｋｇ。每公顷面积施有效剂量３０００～６０００ｇ，施后１８０～２４０天检测，甘蔗中最终残留量＜０．００６ｍｇ／ｋｇ。在甘蔗中的残留量消解动态方程，南宁市郊区Ｃ＝０．０２５７ｅ－０．０４７７Ｔ、广州市郊Ｃ＝０．０５２０ｅ－０．０６５１Ｔ。在甘蔗中的半衰期１１～１５天，在土壤中为２１—２３天。参照ＦＡＯ／ＷＨＯ标准，克线丹对人体每日允许摄入量０．０５μｇ／ｋｇ天，我国规定克线丹在甘蔗上的最高残留限量０．１ｍｇ／ｋｇ。根据本测定结果，在甘蔗苗期使用克线丹１次，每公顷有效剂量＜６０００克是极为安全的。

The residue of Sebufos in Sugarcane was determined by Gas chromatography The degree of accuracy,standard deviation,minimum detectable quantity,minimum detectable concentration were 92 78% 99 03%,0 2166 1 8930mg/kg,7 5758×10 10 g and 0 0061 mg/kg,respectively.When the effective dosage was from 3000g/ha to 60000g/ha,final residue of Sebufos in sugarcane plants was less than 0 006mg/kg 180 240 days after application The decomposition equations for Suburbs of Nanning,Guangxi and for Guangzhou,Guangdong were C=0 0570e 0 0477T and C=0 0520e 0 0651T ,respectively The half life was 11 15 days in sugarcane and 21 23 days in soils With reference to FAO/WHO standard(ADI=0 05 ug/kg/day)and China's MRL(0 1mg/kg),the results of this experiment showed that it is very safety when Sebufos is applied one time with a dosage of 6000g/ha at young stage of sugarcane