固定污染源废气监测用挥发性卤代烃标准气体制备不确定度研究  

Research on Preparation Uncertainty of Volatile Halogenated Hydrocarbon Reference Materials for Exhaust Gas Monitoring of Stationary Pollution Sources

作　　者：杨静 杜健 邱鹏 黄伟 高冰 YANG Jing;DU Jian;QIU Peng;HUANG Wei;GAO Bing(Institute of Environmental Reference Materials,Environmental Development Center of the Ministry of Ecology and Environment,Beijing 100029,China;State Environmental Protection Key Laboratory of Environmental Pollutant Metrology and Reference Materials,Beijing 100029,China)

机构地区：[1]生态环境部环境发展中心环境标准样品研究所,北京100029 [2]国家环境保护污染物计量和标准样品研究重点实验室,北京100029

出　　处：《中国环境监测》2024年第1期216-225,共10页Environmental Monitoring in China

基　　金：中日友好环境保护中心科技发展基金项目。

摘　　要：针对固定污染源挥发性卤代烃污染物的排放监测需求,采用称量法制备固定污染源废气监测用挥发性卤代烃标准气体(各组分具有浓度差异),并开展制备不确定度评定研究。通过分析原料试剂纯度、液态/气态组分称量、混合液配比、摩尔质量、气体残留等因素和环节引入的不确定度,确立标准气体制备不确定度评定流程。最终,确定固定污染源废气监测用挥发性卤代烃标准气体制备过程引入的相对扩展不确定度(k=2)小于1%。液态/气态组分称量和上一级中间气浓度引入的不确定度对特性量值不确定度的贡献较大,原料试剂纯度对不确定度的影响较小,摩尔质量和气体残留对不确定度的影响可忽略。According to the emission control demands of volatile halogenated hydrocarbon pollutants from stationary pollution sources,volatile halogenated hydrocarbon reference materials for exhaust gas monitoring of stationary pollution sources(each component has different concentration levels)were prepared by weighing method and its preparation uncertainty was evaluated.The uncertainty of raw material purity,weighing quality of liquid and gas components,raw material solution ratio,molar mass and other factors were analyzed.The relative expanded uncertainty(k=2)for the preparation of volatile halogenated hydrocarbon reference materials for stationary source monitoring was evaluated through the GUM law and calculated as less than 1%.The results showed that the weighing quantity of liquid/gas material and upper intermediate gas concentration had the greatest influence on preparation uncertainty,the uncertainty of raw material purity,weighing quality of nitrogen and raw material solution ratio had the greater influence on preparation uncertainty and the uncertainty of molar mass and residual gas were negligible.

关 键 词：标准气体 挥发性卤代烃 固定源 不确定度 

分 类 号：X830.5[环境科学与工程—环境工程]