title: [Development of standard gas mixture of chlorinated hydrocarbons in nitrogen].
abstract: A method for the preparation of the standard gas mixture of 6 chlorinated hydrocarbons, containing dichloromethane, 1,1-dichloroethane, 1,2-dichloroethane, chloroform, 1,1, 1-trichloroethane, and 1,1,2-trichloroethane, at the concentration of 5 micromol/mol in nitrogen was developed. The reproducibility of this method and the homogeneity and long-term stability of the standard mixture were evaluated. The results showed that all 6 chlorinated hydrocarbons have shown stability as long as 12 months and the expanded relative uncertainty of 5%. The certified value of developed standard gas agreed with the similar standard gas from Scott Specialty Gases. This research established a foundation for the analysis of volatile chlorinated hydrocarbon gases.
authors.affiliation: Institute for Environmental Reference Materials of Ministry of Environmental Protection, Beijing 100029, China. li.ning@ierm.com.cn
authors.forename: Ning
authors.initials: N
authors.lastname: Li
authors.forename: Qian
authors.initials: Q
authors.lastname: Wang
authors.forename: Jian
authors.initials: J
authors.lastname: Guo
authors.forename: Shuaibin
authors.initials: S
authors.lastname: Wang
authors.forename: Wen
authors.initials: W
authors.lastname: Tian
authors.forename: Zhongxiang
authors.initials: Z
authors.lastname: Wu