Amico Di Meane Elena, Sega Michela
Istituto di Metrologia Gustavo Colonnetti-Consiglio Nazionale delle Ricerche Strada delle Cacce 73, 10135 Torino.
Ann Chim. 2003 May-Jun;93(5-6):583-7.
The present work deals with the evaluation of measurement uncertainty in the determination of carbon dioxide (CO2) concentration in atmosphere, given the high relevance of this greenhouse gas that influences earth climate. In order to carry out CO2 measurements, non dispersive infrared (NDIR) analysers are usually employed as they are stable and scarcely affected by interferences from other air components or pollutants. Typical uncertainty sources are the resolution of the analyser, its time drift and the contributions due to instrument calibration, which is required in order to produce traceable measurement results. The calibration uncertainty takes into account the uncertainty of the composition of the calibration gas mixtures, the instrument repeatability and the possible or residual lack of fit of the adopted mathematical model.
鉴于这种影响地球气候的温室气体具有高度相关性，本研究致力于评估大气中二氧化碳（CO₂）浓度测定中的测量不确定度。为了进行CO₂测量，通常采用非色散红外（NDIR）分析仪，因为它们稳定且几乎不受其他空气成分或污染物干扰的影响。典型的不确定度来源包括分析仪的分辨率、其时间漂移以及仪器校准所带来的影响，而进行仪器校准是为了获得可溯源的测量结果。校准不确定度考虑了校准气体混合物成分的不确定度、仪器的重复性以及所采用数学模型可能存在的或残余的拟合不足。
