钨精矿中三氧化钨量测定的不确定度评定

Uncertainty Evaluation of Tungsten Trioxide Contents Determination in Tungsten Concentrate

研究采用重量法测定钨精矿中三氧化钨量,由数学模型分析得到实验过程中不确定度主要来源为称样、标准溶液配制、校准曲线拟合及测量重复性等。采用数学模型对各来源分量进行量化与合成计算。结果表明,钨精矿中三氧化钨的质量分数为66.20%时,测量结果的扩展不确定度为0.37%,由各分量的标准不确定度对比可知,实验操作中的重量部分是不确定度的主要来源,而测量重复性对重量部分不确定度贡献最大。因此,在日常检测工作中需严格把控测量重复性的相关影响因素,由此来减少测量结果的不确定度。

The measurement uncertainty of tungsten trioxide contents in tungsten concentrate is mainly due to sample weighing,standard solution preparation,standard curve fitting and measurement repeatability.Mathematical model is used to quantify the component.The results show that as the mass fraction of tungsten trio-xide in tungsten concentrate was 66.20 % and the expanded uncertainty of measurement re-sults was 0.33 %.The influence of measurement repeatability should be strictly controlled to reduce the uncertainty.