摘要
在我国首先采用气相色谱NPD测定丙硫克百威及其有毒代谢物在水稻及环境要素（水、土）中的残留。该方法的平均回收率为80.3～96.2％,变异系数1.64～6.87％,丙硫克百威及其代谢物克百威、3—羟基克百威的最小检知浓度依次为25、10、40ppb。效果良好,比国外用气相色谱分析同类样品的方法简便、安全、成本低。稻田小区和大田试验分析结果表明:丙硫克百威及其代谢物无论是稻米、稻草、谷壳糠或稻田水、土中的残留量均与施药量、施药次数呈正相关。稻体内的消解速率比环境要素水、土的速率慢2～3倍。残留高峰期,稻田土为施药当天,田水、稻草为施药后3天,稻米、谷壳糠为施药后第5天。高峰期出现后均随时间推移按C=Coe^(-kT)指数方程幂函数递减。半衰期（T/2）田水8天,田土10天,稻米15天,稻草24天,谷壳糠23天。参照有关毒性规定,5％丙硫克百威颗粒剂30～60公斤/公顷,水稻生育期撒施1～2次,等收期30天,是安全的。
Benfuracarb (2, 3-dihydro-2, 2-dimethyl-7-benzofuranyl N (N-(2-(ethoxycarbony)ethyl) -N-isopropyl sulfenamovl)-N-methy Carbamate) and its toxic metabolites residued in rice and the essential factors of environment (water and soil) were first detected by gas chrpmatography NPD in China. The average of recovery of the detective method ranged from 80.3-96.2%, the coefficient of variation was 1.64-8.67%. The detectable concentration of benfuracarb and its metabolites carb-ofuran, 3-hydroxy-carbofuranwas 25 , 10 , 20 ppb respectively. The results showed that the residues of benfuracarb and its metabolites in rice, straw, shell, or in water and soil were all in proportion to times and doses of application for serveral years' field experiment. The spead of elimination of these compounds in rice plant were 2-3 times slower than that inmwater and soil. After the application of the pestcide, the summit residual time in soil, water, straw, rice and shell was 0, 3, 3, 5, 5 days, separatively. And then, the residues in all samples were decreased by degrees as time goes on in accordance with the equation of exponential 'function:C = Coe-kT . The half time (T/2) of residues was 7 days in water, 10 days in soil, 15 days in rice, 24 days in straw and 23 days in shell respectively. Reference to some to some relevant rules of toxicity, it is safe for the benfuracarb 5 G to apply torice field xn dose of 30-60 kg/ha and twice times during the growth Period of rice and to hardvest for 30 days after its application.
出处
《西南农业学报》
CSCD
1990年第4期81-86,共6页
Southwest China Journal of Agricultural Sciences
关键词
丙硫克百威
代谢物
稻田
残留动态
pestcide, benfuracarb, metabolite, residue, rice field, safety, gas chromatography
