Using Top-down two uncertainty evaluation methods,the control chart method and the linear fitting method,to evaluate the uncertainty of methane in the non-methane total hydrocarbons in the ambient air by gas chromatography.The results shows that the uncertainty result of the control chart method is:(3.05±0.19)(k=2)mg/m3,the result of using the linear fitting method is in the range of 0.86～8.57(mg/m3),the uncertainty is 0.15,(k=2)mg/m3.There are no obvious differences between the two methods via the result.These two methods are based on the quality control data accumulated daily in the laboratory,daily analysis quality control of environmental laboratories,its operability is stronger,wider scope of application.
关键词
控制图法/线性拟合法/不确定度/甲烷
Key words
control chart method/the linear fitting method/uncertainty/methane
维普
万方数据