铜精矿中铁含量测定的不确定度评定

Evaluation of Uncertainty in Determination of Iron Content in Copper Concentrate

用重铬酸钾滴定法测定铜精矿中铁的含量,对其测量不确定度进行评定,分析了在整个实验过程中的不确定度来源,其主要来源有重铬酸钾标准溶液的浓度,滴定体积,试样称量以及重复性实验等。对各部分不确定度分量进行了量化计算,得出了合成标准不确定度,扩展不确定度,并以不确定度的形式给出测定结果。

Potassium dichromate titration was used to test the iron content of copper concentrate.The uncertainty of the mea⁃surement was evaluated and analyzed for the uncertain sources of whole experiment process.It is found that the main sourc⁃es were the concentration of potassium dichromate solution,volume of the titration,mass of testing sample and repetition.Each part of uncertainty was quantified to obtain the compound uncertainty and expanded uncertainty.Various of forms of uncertainty with the testing results are given.