双柱双检测器气相色谱法同时进样分析非甲烷烃的不确定度

UNCERTAINTY OF NON-METHANE HYDROCARBONS DETERMINED SIMULTANEOUSLY BY GAS CHROMATOGRAPH WITH DOUBLE COLUMNS AND DETECTORS

双柱双检测器气相色谱法同时进样分析非甲烷烃,对甲烷、总烃、氧气和仪器引入的不确定度进行了评定。结果显示,本法测定不确定度的主要来源为标准气体的不确定度,其次是色谱分析仪器引入的不确定度,相对分子质量引入的不确定度可忽略不计。环境空气中非甲烷烃测定结果为(0.85±0.14)mg/m3,k=2。

Non-methane hydrocarbons in the gas sample were analyzed simultaneously by GC with double columns and double FIDs. The uncertainty components of methane, hydrocarbons, oxygen and instruments were evaluated. The results showed that the main source of the uncertainty was the uncertainty of standard gas, the second was the gas chromatography, and the uncertainty of mo- lecular weight could be ignored. So the detection results of non-methane hydrocarbons was （0.85 ±0.14） mg/m3 ,k = 2.