【摘要】 采用乙腈振荡提取,GC-ECD测定,建立了小麦田土壤中炔草酯残留量的测定方法。在0.01~2.0 mg·kg-1质量浓度范围内,气相色谱峰面积与炔草酯质量浓度呈良好的线性关系,相关系数为R2=0.999 4。外标法定量,土壤中添加炔草酯质量分数分别为0.01、0.1 mg·kg-1和0.5 mg·kg-1,平均回收率分别为95.91%、89.50%和75.35%,相对标准偏差分别为2.66%、7.64%和4.23%,最低检出浓度为0.01mg·kg-1。检测结果表明,该测定方法前处理简便快速、成本低、结果准确,能够满足土壤中炔草酯残留量的分析要求。在山东和湖南开展的2年两地土壤田间试验结果表明,炔草酯在土壤中30 d的消解率均超过99%,理论半衰期为2.7~3.9d,属于易降解农药。更多还原

【Abstract】 GC-ECD method was developed for the determination of clodinafop-propargyl in wheat soil. The soil samples were extracted with acetonitrile. The linearity of the GC-ECD method was satisfied (R2=0.999 4) in the concentration range of 0.01~2.0 mg·kg-1. The average recoveries in soil were 95.91%, 89.50% and 75.35%, respectively, the coefficients of variation were 2.66%, 7.64%和 4.23%, by adding clodinafop-propargyl into wheat soil at three concentration levels (0.01, 0.1, 0.5 mg·kg-1). The limitofquantification in soilwas 0.01 mg·kg-1. The detection results showed that GC-ECD method was economic and accurate whose pretreatment was simple and rapid. Two years field experiments in Shandong Province and Hunan Province revealed that the residue of degradation dynamics in 30 d were more than 99%, and the half-life of clodinafop-propargyl were 2.7~3.9 d.更多还原