工作场所空气中盐酸含量测定的不确定度分析

目的分析工作场所空气中盐酸含量测定过程中的不确定度,明确实验中对结果准确性影响较大的环节。方法找出实验过程中各不确定度分量,计算合成标准不确定度以及扩展不确定度。结果在各分量不确定度中,标准溶液配置引入的不确定度和样品定容引入的不确定度对实验结果的不确定度贡献是较大的。结论实验过程中,首先应选择合格的标准物质,配制标准溶液时要细心、准确,其次样品定容时操作要规范,以减少不确定度。

Uncertainty Analysis of Hydrochloric Acid Content Determination in The Air of Workplace

Objective] To analyze the uncertainty of hydrochloric acid content determination in the air of workplace, confirm the greater influence links on the accuracy of test results. Methods] Uncertainty components were found; combined standard uncertainty and expanded uncertainty were calculated. Results ] Among all components, components for standard solution configuration and sample constant volume contributed most to the test results. Conclusion ] During the experimental process, firstly, the standard substances should be chosen, the preparation of standard solution should be careful and accurate ; secondly, the sample constant volume operation should be standardized to reduce uncertainty.