稻瘟酰胺在水稻植株及稻田水、土壤中的 消解动态研究

为评价稻瘟酰胺在水稻上使用的安全性,建立其使用规范,于2006-2007年研究了35%酰胺·稻瘟灵乳油(稻瘟酰胺∶ 稻瘟灵=30∶ 5,质量比)中稻瘟酰胺在浙江和福建两地水稻植株及稻田水、土壤中的消解动态。结果表明:稻瘟酰胺标准溶液的线性方程为y=246 192x+925.88(r=0.999 7),线性范围为 0.005~1 mg/L。残留分析中样品采用乙腈和乙酸乙酯提取,经中性氧化铝和弗罗里硅土柱层析净化,气相色谱检测。当样品中添加水平为0.001~1 mg/kg时,采用该方法测得的平均回收率为78.6% ~108.4%,相对标准偏差(RSD)在3.5% ~23.4%之间;其在水稻植株、土壤和田水中的最低检测浓度(LOQ)均为0.001 mg/kg(L)。田间试验结果表明,稻瘟酰胺在稻田样品中的消解动态曲线符合一级动力学方程,其在水稻植株、土壤以及田水中消解迅速,半衰期分别为5.2~9.5、3.8~7.3、0.8~3.2 d。

Residue decline study of fenoxanil in paddy plant,paddy field water and soil

Aimed to evaluate the safety and regular use of fenoxanil in paddy field,residue decline study of fenoxanil (in fenoxanil and isoprothiolane 35% EC formulation) in paddy plant,water and soil in Zhejiang and Fujian Province were investigated between year 2006 －2007.Results indicated that the linear equation of standard solution was y=246 192x+925.88(r=0.999 7) with the linearity of 0.005 －1 mg/L,the average fortification recoveries varied from 78.6% to 108.4% with relative standard deviation (RSD) of 3.5% －23.4% when fenoxanil was spiked at 0.001 －1 mg/kg(L) level in various matrixes,and the limits of quantification (LOQ) in paddy plant,soil and water were 0.001 mg/kg(L).The decline study of fenoxanil in paddy field was carried out,the decline curves accorded with the first-order kinetics equation,and the half-lives of fenoxanil in paddy plant,soil and water were of 5.2 －9.5,3.8 －7.3 and 0.8 －3.2 d,respectively.