工作场所空气中二甲苯含量的不确定度分析

目的分析工作场所空气中二甲苯含量测定过程的不确定度,明确实验中对结果准确性影响较大的环节。方法按照国标方法对空气中二甲苯进行测定,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,仪器本身引入的不确定度和重复测量引入的不确定度对实验结果的不确定度贡献较大。结论在注重各个环节质量的前提下,选择精密的仪器以及尽可能多的重复测量待测样品,才能得出可靠的实验结果。

Uncertainty Analysis of Dimethylbenzene Content in The Air of Workshop

[ Objective ] To analyze the uncertainty in the process of determining dimethylbenzene content in the air of workshop, and identify the links which have greater impact on the results. [ Methods] The dimethylbenzene content was measured by national standard, uncertainty components were identified, combined standard uncertainty and expanded uncertainty were calculated. [ Results ] Among all uncertainty components, the introduction of uncertainty by apparatus and repeated measurements contributed most to the uncertainty of the results. [ Conclusion] Under the premise of emphasis on quality of all aspects, sophisticated apparatus and enough samples for repeated measurements can bring reliable results.