The uncertainty of determination of total iron content in pyrite and concentrate by titanium trichloride potassium dischromate volumetric method was evaluated. The main sources of uncertainty were analyzed, which included the precision of the irtstrument, the purity of the standard material, the weight of the sample, the measurement repeatability and so on. When the total iron content was 42.06 %, the expanded uncertainty was 0.24 %.%在文章中,对三氯化钛-重铬酸钾容量法测定硫铁矿和硫精矿中全铁的不确定度进行了评定,分析了测量不确定度的来源,包括仪器的不确定度、标准物质纯度的不确定度、试样称量的不确定度和测量重复性的不确定度等.通过评定,当硫铁矿和硫精矿中全铁含量为42.06%时,测量结果的扩展不确定度为0.24%.
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