新型杀菌剂苯菌酮在3种典型土壤中的淋溶行为

农药在土壤中的淋溶规律已成为研究热点之一,同时也是农药登记的必备数据。建立了土壤中苯菌酮残留量的超高效液相色谱-串联质谱(UPLC-MS/MS)分析方法,并通过土壤薄层层析和土柱淋溶试验,研究了苯菌酮在我国3种典型土壤中的淋溶行为。结果表明:苯菌酮在3种土壤中的平均添加回收率在81%~109%之间,相对标准偏差(RSD)为1.2%~13.4%,检出限(LOD)为0.29~0.30μg/kg。薄层层析试验表明,苯菌酮在河北潮土、湖南红壤和黑龙江黑土中的比移值(Rf)分别为0.17、0.26和0.15。土柱淋溶试验表明,苯菌酮在河北潮土、湖南红壤及黑龙江黑土第1段(0~10 cm)土柱中的含量比例(R1)分别为原始添加量的99%、80%和99%。根据我国化学农药环境安全评价标准,苯菌酮在3种土壤中的迁移特性均为不易移动,因此不易对地下水造成污染。研究结果可为苯菌酮在我国登记以及其安全使用提供基础数据。

Study on leaching behavior of metrafenone in three typical soils

Study on the leaching behavior of pesticides has attracted many international attention. It is also one of the necessary data for registration of pesticides. A method for determination of metrafenone in soil was developed by using ultra-performance liquid chromatography/tandem mass spectrometry(UPLC-MS/MS) detection. Typical methods of soil thin-layer and column leaching were adopted to investigate the leaching behavior of metrafenone in three typical soils. The result showed that the analytical method recoveries ranged from 81% to 109% for target compound with relative standard deviations(RSD) of 1.2%-13.4%. The limit of detection(LOD) of the method were 0.29-0.30μg/kg. Rf of fluvo-aquic soil of Hebei, red soil of Hunan and black soil of Heilongjiang are 0.17, 0.26 and 0.15, respectively. It's found that 99%, 80% and 99% of the original dosage of metrafenone were in the first soil column(0-10 cm) in leaching study. According to the Chinese guidelines on environmental safety assessment for chemical pesticides, the migrations of metrafenone in soils were classified as not easily mobile, and it may have little possibility to leach into groundwater. This study provided basic data for supporting the registration of metrafenone, as well as its safe use.