标准溶液的不确定度对农药残留检测起着非常重要的作用,影响着检测结果的准确性。笔者以实际应用的14种有机磷农药混合标准溶液为例,采用配制混合标准溶液过程单元操作的不确定度计算方法(top down),分析了在配制混合标准溶液过程中的所有影响因素,得到了最终的扩展不确定度。最终结果显示使用精准的移液器将储备液配置为混合标液,得到最终的扩展不确定度相对小。 The uncertainty of the standard solution plays a very important role in pesticide residue detection and affects the accuracy of the test results. Taking the 14 kinds of organophosphorus pesticide mixed standard solution actually used as an example, the author used the top down method of preparing the mixed standard solution process unit to analyze all the influencing factors in the process of preparing the mixed standard solution, The final expansion of uncertainty. The final results show that using a precision pipettor to configure the stock solution as a mixed standard gives a relatively small final expanded uncertainty.