计量学报2025，Vol.46Issue(12)：1703-1710,8.DOI:10.3969/j.issn.1000-1158.2025.12.01
基于外标法和同位素歧视效应修正算法准确定值环境空气二氧化碳及甲烷气体标准物质
Accurate Certification of Environmental Carbon Dioxide and Methane Reference Materials Using External Standard Method and Isotope Discrimination Effect Correction Algorithm
摘要
Abstract
A system for the determination of gas reference materials of carbon dioxide(CO2)and methane(CH4)from ambient air was established based on external standard method and the algorithm for correcting isotopic discrimination effect.The results showed that the correcting algorithm can improve the accuracy of determining value results of standard gas.The analytic system showed good precision and accuracy when using both direct external standard method and reference external standard method.The standard deviation of determining values for CO2 and CH4 is less than 0.03 μmol/mol and 0.1 nmol/mol,respectively.The calibration values of CO2 in this study were comparable with the quantification results of the World Meteorological Organization(WMO).The results of the paired sample t-test indicated that there is no significant difference between direct external standard method and reference external standard method.Compared with direct external standard method,the reference external standard method can be kept stable within two months,which saving the previous level of standard gases significantly.关键词
气体标准物质/温室气体/二氧化碳/甲烷/同位素歧视效应/外标法/量值传递Key words
gas reference material/greenhouse gases/carbon dioxide/methane/isotopic discrimination effect/external standard method/value transfer分类
通用工业技术引用本文复制引用
徐驰,王万里,吕怡兵,毕哲,王红红,翟东肖,武壮坤,师耀龙..基于外标法和同位素歧视效应修正算法准确定值环境空气二氧化碳及甲烷气体标准物质[J].计量学报,2025,46(12):1703-1710,8.基金项目
国家重点研发计划(2021YFC2800402,2023YFF0724404) （2021YFC2800402,2023YFF0724404）
