活性炭吸附-碘量法测低品位矿石中金的不确定度评定

Uncertainty Evaluation for determination of gold in low-grade gold ores by iodometry with activated carbon adsorption

根据不确定度评定方法,对活性炭吸附-碘量法测量低品位矿石中金的不确定度来源进行分析,对其不确定度分量进行量化计算,找出影响检测结果的主要因素。本文针对某低品位金矿石样品,采用活性炭吸附-碘量法测量其金含量并计算扩展不确定度为0.68±0.10ug/g。研究发现活性炭吸附-碘量法不确定度主要来源为样品滴定过程消耗标液体积和重复性测定。

Based on the theory of uncertainty evaluation, we analyze the main sources of the uncertainty of gold in lowgrade ore sample by iodometry method with activated carbon adsorption, calculate its quantify uncertainty components, identify the main factors that affect the detection results. In this paper, a low-grade gold ore sample was analyzed by iodometry method with activated carbon adsorption to determine the gold content and calculate its expanded uncertainty which is 0.68±0.10ug/g. We found that the main uncertainty for iodometry method with activated carbon adsorption is the volume of standard solution consumed during the titration and repeatability of measurement.