Analysis of the stable carbon isotope composition of formic and acetic acids

	Analysis of the stable carbon isotope composition of formic and acetic acids
	Xinqing Lee; Like Zhang; Daikuan Huang; Ning An; Fang Yang; Wei Jiang; Bin Fang
	2013
发表期刊	Analytical Biochemistry
卷号	436 期号:2 页码:178-186
摘要	Formic and acetic acids are ubiquitous in the environment and in many biological processes. Analysis of the stable carbon isotope composition (delta C-13) of formic and acetic acids is important to understanding their biogeochemical cycles. However, it has been faced with poor accuracy and high detection limits due to their low carbon number, high hydrophilicity, and semi-volatility. Here we developed an analytical technique by needle trap and gas chromatography-isotope ratio mass spectrometry (GC-IRMS). The organic acids in aqueous solution were extracted using a NeedlEx needle through purge-and-trap and were analyzed by GC-IRMS for delta C-13. The procedures incur no isotope fractionation. Defined as the point at which the mean delta C-13 is statistically the same as the given value and the analytical error starts rising, the method's detection limits are 200 and 100 mg/L for formic and acetic acids, respectively, with an uncertainty of approximately 0.5 parts per thousand in direct extraction and analysis. They were lowered to 1 mg/L with precision of 0.9 parts per thousand after samples were subjected to preconcentration. The method was successfully applied to natural samples as diverse as precipitation, vinegars, ant plasma, and vehicle exhaust, which vary considerably in concentration and matrix of the organic acids. It is applicable to the organic acids in not only aqueous solution but also gaseous phase.
学科领域	环境地球化学
收录类别	SCI
语种	英语
文献类型	期刊论文
条目标识符	http://ir.gyig.ac.cn/handle/352002/5089
专题	环境地球化学国家重点实验室_环境地球化学国家重点实验室_期刊论文
推荐引用方式 GB/T 7714	Xinqing Lee,Like Zhang,Daikuan Huang,et al. Analysis of the stable carbon isotope composition of formic and acetic acids[J]. Analytical Biochemistry,2013,436(2):178-186.
APA	Xinqing Lee.,Like Zhang.,Daikuan Huang.,Ning An.,Fang Yang.,...&Bin Fang.(2013).Analysis of the stable carbon isotope composition of formic and acetic acids.Analytical Biochemistry,436(2),178-186.
MLA	Xinqing Lee,et al."Analysis of the stable carbon isotope composition of formic and acetic acids".Analytical Biochemistry 436.2(2013):178-186.

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