26%2甲4氯钠·烟嘧磺隆悬浮剂在玉米及其土壤中的消解动态与残留

Residue and Decline of MCPA-sodium and Nicosulfuron 26% SC in Corn and Soil

【目的】评价2甲4氯钠在玉米上使用的安全性，建立其使用规范。【方法】样品采用酸碱调节pH值混合溶剂提取，层析柱净化，高效液相色谱VWD检测器进行检测，外标法定量。[结果]在植株和土壤中半衰期分别为1．4-2．7、1．8-4．8d；检测的玉米籽粒、玉米植株及土壤中2甲4氯钠的残留量均低于0．05mg／kg。[结论】结合日本和欧盟在玉米上2甲4氯钠最大残留限量，拟推荐我国2甲4氯钠在玉米和玉米秸秆上的最大残留限量为0．1mg／kg。

[Aims] It was to evaluate the safety and establish the regular use of MCPA-sodium in corn field. [Methods] Samples were extracted by mixed solvent of acid and alkali adjusting pH and purified by chromatography- column, detected by high performance liquid chromatography-VWD, and quantified by external standard method. [Results] The half-lives of MCPA-sodium in corn plant and soil were 1.4-2.7 and 1.8-4.8 d, respectively. The total residue of MCPA-sodium in corn seed, plant and soil were less than 0.05 mg/kg. [Conclusions] Combined with MCPA-sodium MRLs on corn of Japan and European Union, the recommended MRL for MCPA- sodium in corn and corn plant should be 0.1 mg/kg in China.