• 关键词：溴虫腈  残留  降解  半衰期

• 基金项目：国家"863"项目"环境友好型纳米农药制剂的开发与研究"(No.2001AA218041);国家自然科学基金(No.No.20377029)

• 陈九星
• 湖南化工研究院剂型研究所, 长沙 410007

• 曹永松
• 上海交通大学环境科学与工程学院, 上海 201101

• 王跃龙
• 湖南化工研究院剂型研究所, 长沙 410007

• 陈力华
• 湖南化工研究院剂型研究所, 长沙 410007

• 梁骥
• 湖南化工研究院剂型研究所, 长沙 410007

• 李涛
• 湖南化工研究院剂型研究所, 长沙 410007

• 陆贻通
• 上海交通大学环境科学与工程学院, 上海 201101

• 摘要：建立了用高效液相色谱法检测甘蓝和土壤中溴虫腈残留的分析方法.土壤和甘蓝样品经丙酮/水混合液(体积比为8:2)提取,用装有无水硫酸钠和中性氧化铝的层析柱净化,用C₁₈柱作为分析柱,甲醇与水混合液(体积比为80:20)作为流动相,在260 nm的检测波长下,用高效液相色谱法定量测定甘蓝和土壤中残留的溴虫腈.在溴虫腈添加质量比为0.1～1.0mg·kg^-1范围内,甘蓝和土壤样品的平均回收率为90.6%～93.3%,变异系数为1.9%～11.6%,在上述条件下,甘蓝和土壤中的最低检出限为0.016 2 mg·kg^-1.应用上述方法,测定了10%溴虫腈纳米功Ζ能化制剂和10%溴虫腈悬浮剂在甘蓝和土壤中的降解动态.结果表明,10%溴虫腈纳米功能化制剂和10%悬浮剂在甘蓝中的降解动态方程分别为C=4.043 1e^-0.3103t(R²=0.952 8)和C=6.961 le^{-0.268 6t}(R²=0.927 2),半衰期分别为t_0.5=2.2 d和2.6 d;在土壤中的降解动态方程分别为C=0.253 8e^{-0.161 2t}(R²=0.9281)和C=0.537e^-0.1754t(R²=0.9845),半衰期分别为t_0.5=4.3 d和3.9 d.按推荐剂量的加倍量施药,在甘蓝中的最终残留低于美国国家环保署规定之蔬菜最大允许残留量(1 mg·kg^-1).10%溴虫腈纳米功能化制剂在甘蓝和土壤中的降解都比10%溴虫腈悬浮剂快,且作物的最终残留量也比较少,所以,溴虫腈纳米功能化制剂能较好地减少其在作物和土壤中的残留.

• Abstract：A method for determining residue of chlorfenapyr in cabbage and soil was developed by HPLC. The chlorfenapyr residue in cabbage and soil was extracted with acetone-water solution (8:2, V/V), and cleaned up by the column filled with anhydrous sodium sulfate and neutral aluminum oxide. The quantification of chlorfenapyr residue was established by HPLC equipped with a C₁₈ Column and 260nm wavelength detector and using a mixture of methanol-water (80:20, V/V) as flow phase. When adding of chlorfenapyr at the concentration of 0.1mg·kg^-1 ～1.0mg·kg^-1, The average recovery rate for the cabbage and soil sample was in a range of 90.6%～93.3%, and coefficient of variation was 1.9%～11.6%. The minimum detected concentration for cabbage and soil was 0.0162 mg·kg^-1. The degradation of 10% chlorfenapyr nanoformjlation and 10% SC in cabbage and soil was investigated using above method. The results showed that the degradation of chlorfenapyr in cabbage and soil was in accord with the regression equation. The residue degradation equations of 10% chlorfenapyr nanoformulation and 10% SC in cabbage were C=4.043 1e^-0.3103t(R²=0.952 8) and C=6.961 1e^-0.2686t(R²=0.9272), respectively, and the half lives were 2.2d and 2.6d, respectively. The residue degradation equations in soil were C=0.2538 e^-0.1612t(R²= 0.9281) and C=0.537e^-0.1754t (R²= 0.9845), and the half lives were 4.3d and 3.9d, respectively. When chlorfenapyr was applied at the double recommended dosage, the final residue in cabbage was much lower than the USA EPA's maximum residue limit of 1 mg·kg^-1 in vegetable. The degradation rates of the chlorfenapyr nanoformulation in cabbage and soil were faster than that of the chlorfenapyr SC, and its final residue was also lower. Therefore, chlorfenapyr nanoformulation could decrease greatly its residue in the crop and soil.

• Key words：chlorfenapyr  residue  dissipation  half life

• 
  摘要点击次数： 2168 全文下载次数： 3370