环境监测用5种氯代烯烃混合气体标准样品研制  

Development of a Standard Reference Material Containing 5 Chlorinated Hydrocarbons for Environmental Monitoring

作　　者：李宁[1] 范洁[1] 王倩[1] 樊强[1] 

机构地区：[1]环境保护部标准样品研究所,北京100029

出　　处：《中国环境监测》2014年第5期101-104,共4页Environmental Monitoring in China

基　　金：环保公益性科研专项(201309013);国家重大科仪专项(2012YQ060027)

摘　　要：介绍了1μmol/mol氮气中5种氯代烯气体标准样品的研制方法。这5种氯代烯包括氯乙烯、1,1-二氯乙烯、顺1,2-二氯乙烯、三氯乙烯、四氯乙烯,其中氯乙烯常温下为气态,其他4种为液态,并且沸点低,将这几种氯代烯制备成气体标准样品存在制备精度低、气液转换不完全等困难。经研究,采用2步称量法制备5种氯代烯气体标准样品,重复制备的相对标准偏差小于1.6%。建立了5种氯代烯标准气体瓶内均匀性的实验方法,并通过考察样品量值伴随样品压力的变化来评价样品的均匀性。结果显示,5种氯代烯标准气体是均匀的,最低使用压力为1 MPa。依照ISO 15000.3来考察样品的时间稳定性,样品有效期为12个月。相对扩展不确定度为3%(置信度为95%)。The development of reference material of the mixed gas of five hydrochloric hydrocarbons was described. Vinyl chloride is gas,1,1-Dichloroethylene cis-1,2-Dichloroethene,Trichloroethylene,Trichloroethylene,Tetrachloroethylene are liquid at room temperature,and so it is difficult to prepare an accurate a standard Reference Material containing 5 Chlorinated hydrocarbons. This research adopts two-step weighting method to prepare the standard gas of five hydrochloric hydrocarbons,and the relative standard deviation of preparation repeatability is less than 1. 6%. The experimental method of within-bottle homogeneity of 5 chlorinated hydrocarbon gas standards was developed,and whether the trend for the values varying with the sample pressure changed was used to investigate the sample homogeneity. Based on experimental results,5 volatile chlorinated hydrocarbons standard gas is homogeneous,and the minimum pressure was determined as 1MPa. The experiment design and data evaluation of long-stability is according to ISO Guide 35（ Reference materials-General and statistical principles for certification）.Individual Sample was measured as time elapses over a period of 12 months under identical conditions. The analytical data showed no instability was observed and all 5 chlorinated hydrocarbons in treated aluminum gas cylinders was stable for as long as12 months. The relative expanded uncertainty is 3%（ confidence coefficient is 95%）.

关 键 词：气体标准样品 均匀性 稳定性 不确定度 

分 类 号：X830.5[环境科学与工程—环境工程]