为了分析NY/T761-2008测定蔬菜中氨基甲酸酯类农药残留量的不确定度主要来源,通过液相色谱法对豇豆中的灭多威农药残留量进行测定,分析整个测量过程中的不确定度来源,并对不确定度各分量进行了评估.最终计算出了相对合成标准不确定度和相对扩展不确定.结果表明,影响结果的主要不确定度分量是样品峰面积的测定和样品前处理的溶液体积.因此,要降低检测结果的不确定度,要在样品测定前做好仪器调试,确保仪器的良好工作状态,并在分取提取液和定容溶液时尽可能的操作精确.%To find out the main sources of measurement uncertainty in the data of carbamate pesticides determination in vegetables by NY/T761-2008, methomyl residues in cowpea were determined by liquid chromotography( LC). The sources of uncertainty in the whole measuring process were analyzed, and the uncertainty components were evaluated. Ultimately, the relative synthesis standard uncertainty and the relative expansion uncertainty were calculated out. It was showed that measurement uncertainty was mainly derived from the two procedures of peak area of sample solution and solution volume. Therefore, it was necessary to confirm the good state of LC instrument and precise operation in two forementioned procedures for decreasing measurement uncertainty.
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