摘要
针对用外标法和比例校正归一法定量的天然气组成气相色谱常规分析,研究了其结果的不确定度来源及评定方法,以实例说明了评定步骤,并分析了各因素对评定结果的影响程度。结果表明,浓度越高的组分重复性引入的不确定度值也越大;单点外标定量时校正因子变动性引入的不确定度不应忽略;仅规定标准气的浓度范围可能得不到准确的外标定量结果;组分含量较小时,使用推荐的FID相对校正因子有可能满足定量准确度要求。
The uncertainty of the composition analysis results of natural gas by gas chromatography was evaluated,which were quantified by external reference method and modified normalization method. The sources of uncertainty and their influence factors on analysis results were analyzed as well. It was found that one component of higher concentration accompanied with a larger value of uncertainty brought by repeatability. The uncertainty brought by calibration factor should not be neglected when a single point external standard calibration was conducted. Accurate quantitative results may not be acquired only reference gas in accordance with one certain concentration range was applied.Acceptable results may be acquired quantified by recommendatory FID relative correction factors when low concentration components were analyzed.
出处
《石油与天然气化工》
CAS
CSCD
2011年第1期79-82,86,共5页
Chemical engineering of oil & gas
基金
国家科技支撑计划资助课题(2008BAJ08B04)
关键词
气相色谱
不确定度
单点外标
校正因子
gas chromatography
uncertainty
singlepoint external standard calibration
correction factor
作者简介
戴万能：男．1984年生。四川乐山人．博士生．毕业于同济大学供热、供燃气、通风及空调工程专业，从事燃气燃烧应用研究。地址：（201804）上海市曹安公路4800号．同济大学嘉定校区机械工程学院A316室，E—mail：daiwanneng@tom.cn.
