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对气相色谱-热能分析联用法测定卷烟主流烟气总粒相物中NNK含量的测量不确定度进行评定,分析了NNK含量检测的影响因素,计算了不确定度分量及合成不确定度,当NNK含量测定结果为27.4 ng/支时,扩展不确定度为2.0 ng/支。
The uncertainty of measurement of NNK content in mainstream cigarette smoke was evaluated by gas chromatography coupled with thermal analysis. The influencing factors of NNK content were analyzed. The components of uncertainty and the synthesis uncertainty were calculated. The expanded uncertainty at NNK content of 27.4 ng / cartridge was 2.0 ng / cartridge.