室内条件下土壤含水量对烟嘧磺隆消解的影响  

Effect of water content in soil on the dissipation of nicosulfuron in the indoor condition

作　　者：张佳[1] 陈小员[1] 潘强[1] 田宏哲[1] 高增贵[1] 李兴海[1] 

机构地区：[1]沈阳农业大学植物保护学院,沈阳110866

出　　处：《农药学学报》2014年第4期472-476,共5页Chinese Journal of Pesticide Science

基　　金：公益性行业(农业)科研专项经费资助(201203098);辽宁省高等学校优秀人才支持计划(LJQ2012059)

摘　　要：采用高效液相色谱-紫外光谱（HPLC—UV）法，研究了烟嘧磺隆在不同含水量土壤中的消解动态，分析了土壤含水量对其消解的影响。土壤样品经V（乙腈）：V（磷酸盐缓冲溶液）=1：4提取，采用HPLC-UV法检测不同含水量的土壤中烟嘧磺隆的残留量。结果表明：在0．25～4mg／L范围内，烟嘧磺隆峰面积与其质量浓度呈良好线性关系，相关系数为0．9999。在0．05、0．25和1．25mg／kg3个添加水平下，烟嘧磺隆的回收率为91％～106％，相对标准偏差（RSD）为5．4％～9．5％。检出限（LOD）为0．012mg／kg，定量限（LOQ）为0．04mg/kg。当土壤含水量小于50％时，土壤水分含量变化对烟嘧磺隆消解的影响较小；当含水量大于50％时，烟嘧磺隆消解半衰期呈先增大后减小趋势，其中在含水量为60％和90％的土壤中消解最快，半衰期分别为19．7和18．6d。The dynamics of dissipation and half-life of nicosulfuron with different water content in soil, and the effect of water content in soil on the dissipation of nicosulfuron was studied. Soil samples were extracted with V （acetonitrile） ： V（ phosphate buffer solution） = 1：4, and the residue of nicosulfuron was determined by high performance liquid chromatography with UV detector （HPLC-UV）. Linear correlation of nicosulfuron was 0. 999 9 with concentration between 0.25 - 4 mg/L. The results of fortified experiment showed that the recovery was 91% - 106%, with relative standard deviation （RSD） between 5.4% - 9.5% on the fortified level of 0. 05, 0. 25 and 1.25 mg/kg. The limit of detection （LOD） for nicosulfuron was 0. 012 mg/kg, and the limit of quantification （LOQ） of the method was 0. 04 mg/kg. Water content in soil has only a little effect on the half-life of nicosulfuron when water content was below 50%. The half-life increased first and decreased later when water content was over 50%. The dissipation rate of nicosulfuron was the highest with 60% and 90% watercontent in soil, the half-life was 19.7 and 18.6 d, respectively.

关 键 词：土壤 含水量 烟嘧磺隆 高效液相色谱 消解 半衰期 

分 类 号：TQ450.2[化学工程—农药化工]