An improved GC-ECD method for measuring atmospheric N2O

CORC > 生态环境研究中心 > 中国科学院生态环境研究中心 > 大气环境科学实验室

	An improved GC-ECD method for measuring atmospheric N2O
	Zhang, Yuanyuan 1; Mu, Yujing 1; Fang, Shuangxi 2; Liu, Junfeng 1
刊名	JOURNAL OF ENVIRONMENTAL SCIENCES-CHINA
	2013-03-01
卷号	25 期号:3 页码:547-553
关键词	N2O GC-ECD CO2 exchange flux method comparison
英文摘要	Gas chromatography equipped with an electron capture detector (GC-ECD) has been widely used for measuring atmospheric N2O, but nonlinear response and the influence of atmospheric CO2 have been recognized as defects for quantification. An original GC-ECD method using N-2 as carrier gas was improved by introducing a small flow rate of CO2 makeup gas into the ECD, which could well remedy the above defects. The N2O signal of the improved method was 4-fold higher than that of the original method and the relative standard deviation was reduced from > 1% to 0.31%. N2O concentrations with different CO2 concentrations (172.2 x 10(-6)-1722 x 10(-6) mol/mol) measured by the improved GC-ECD method were in line with the actual N2O concentrations. However, the N2O concentrations detected by the original method were largely biased with a variation range of -4.5%similar to 7%. The N2O fluxes between an agricultural field and the atmosphere measured by the original method were greatly overestimated in comparison with those measured by the improved method. Good linear correlation (R-2 = 0.9996) between the response of the improved ECD and N2O concentrations (93 x 10(-9)-1966 x 10(-9) mol/mol) indicated that atmospheric N2O could be accurately quantified via a single standard gas. Atmospheric N2O concentrations comparatively measured by the improved method and a high precision GC-ECD method were in good agreement.
WOS标题词	Science & Technology ; Life Sciences & Biomedicine
类目[WOS]	Environmental Sciences
研究领域[WOS]	Environmental Sciences & Ecology
关键词[WOS]	NITROUS-OXIDE EMISSIONS ; NORTH CHINA PLAIN ; CHAMBER METHODS ; LAND-USE ; FLUXES ; SOILS ; METHANE ; SYSTEMS
收录类别	SCI
语种	英语
WOS记录号	WOS:000318453800016
公开日期	2016-02-26
内容类型	期刊论文
源URL	[http://ir.rcees.ac.cn/handle/311016/24656]
专题	生态环境研究中心_大气环境科学实验室
作者单位	1.Chinese Acad Sci, Ecoenvironm Sci Res Ctr, Beijing 100085, Peoples R China 2.Chinese Acad Meteorol Sci, Key Lab Atmospher Chem, Ctr Atmosphere Watch & Serv, Beijing 100081, Peoples R China
推荐引用方式 GB/T 7714	Zhang, Yuanyuan,Mu, Yujing,Fang, Shuangxi,et al. An improved GC-ECD method for measuring atmospheric N2O[J]. JOURNAL OF ENVIRONMENTAL SCIENCES-CHINA,2013,25(3):547-553.
APA	Zhang, Yuanyuan,Mu, Yujing,Fang, Shuangxi,&Liu, Junfeng.(2013).An improved GC-ECD method for measuring atmospheric N2O.JOURNAL OF ENVIRONMENTAL SCIENCES-CHINA,25(3),547-553.
MLA	Zhang, Yuanyuan,et al."An improved GC-ECD method for measuring atmospheric N2O".JOURNAL OF ENVIRONMENTAL SCIENCES-CHINA 25.3(2013):547-553.