铅是一种有毒有害的金属元素.在2017年,国家食品药品监督管理总局更新了食品中铅的测定标准.我们将分析实验过程中的每个步骤,对每个步骤引起的不确定度分量进行分析,最后归结为一个总不确定度.%Lead is a poisonous and harmful metal element. In 2017, CFDA updated the determination of lead in food. We analyze the component of uncertainty caused by each step of the experiment, and conclude with a total uncertainty.
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