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Environ Sci Pollut Res Int

Title:		Development of a standard reference material containing 22 chlorinated hydrocarbon gases at 1 mumol/mol in nitrogen
Author(s):		Li N; Du J; Yang J; Fan Q; Tian W;
Address:		"State Environmental Protection Key Laboratory of Environmental Pollutant Metrology and Reference Materials, Beijing, 100029, China. State Environmental Protection Key Laboratory of Environmental Pollutant Metrology and Reference Materials, Beijing, 100029, China. tian.wen@ierm.com.cn"
Journal Title:		Environ Sci Pollut Res Int
Year:		2017
Volume:		20170908
Issue:		31
Page Number:		24177 - 24186
DOI:		10.1007/s11356-017-9774-y
ISSN/ISBN:		1614-7499 (Electronic) 0944-1344 (Linking)
Abstract:		"A gas standard mixture containing 22 chlorinated hydrocarbons in high purity nitrogen was prepared using a two-step weighing method and a gasifying apparatus developed in-house. The concentration of each component was determined using a gas chromatograph with flame ionization detection (GC/FID). Linear regression analysis of every component was performed using the gas standard mixture with concentrations ranging from 1 to 10 mumol/mol, showing the complete gasification of volatile organic compound (VOCs) species in a selected cylinder. Repeatability was also examined to ensure the reliability of the preparation method. In addition, no significant difference was observed between domestic treated and imported treated cylinders, which were conducive to reduction of the cost of raw materials. Moreover, the results of stability testing at different pressures and long-term stability tests indicated that the gas standard at 1 mumol/mol level with relative expanded uncertainties of 5% was stable above 2 MPa for a minimum of 12 months. Finally, a quantity comparison was conducted between the gas standard and a commercial gas standard from Scott Specialty Gases (now Air Liquide America Specialty Gases). The excellent agreement of every species suggested the favorable accuracy of our gas standard. Therefore, this reference material can be applied to routine observation of VOCs and for other purposes"
Keywords:		"Air Pollutants/*analysis China Flame Ionization Gases/*analysis Hydrocarbons, Chlorinated/*analysis Linear Models Nitrogen/chemistry Reference Values Material Preparation Reference Stability Standard VOCs;"
Notes:		"MedlineLi, Ning Du, Jian Yang, Jing Fan, Qiang Tian, Wen eng Germany 2017/09/09 Environ Sci Pollut Res Int. 2017 Nov; 24(31):24177-24186. doi: 10.1007/s11356-017-9774-y. Epub 2017 Sep 8"