Needle trap extraction for GC analysis of formic and acetic acids in aqueous solution

	Needle trap extraction for GC analysis of formic and acetic acids in aqueous solution
	Xinqing Lee; Daikuan Huang; Dawei Lou; Janusz Pawliszyn
	2012
发表期刊	Journal of Separation Science
卷号	35 期号:13 页码:1675-1681
摘要	Formic and acetic acids are ubiquitous in the environment, food, and most of the natural products. Extraction of the acids from aqueous solution is required for their isotope analysis by the gas chromatography-isotope ratio mass spectrometry. To this objective, we have previously developed a purge-and-trap technique using the dynamic solid-phase microextraction technology, the NeedlEX. The extraction efficiency, however, remains unexamined. Here, we address this question using the flame ionization detector and isotope ratio mass spectrometer while comparing it with that of the CAR/PDMS fiber. The results show that the NeedlEX is applicable at a wide range of concentration through coordination of purge volume given the minimum amount 3.7 ng and 1.8 ng of formic and acetic, respectively, is extracted. The efficiency of NeedlEX was 67 times lower than the fiber at 1000 mu g/mL depending on the analyte. It is, however, superior to the latter at 10 mu g/mL or less owing to its lower detection limit. The extraction efficiency of both acids is equivalent in molar amount. This is, however, disguised by the different response of the flame ionization detector. The isotope ratio mass spectrometor overcomes this problem but is compromised by relatively large errors. These results are particularly useful for isotopic analysis of carboxylic acids.
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/352002/4823
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,Daikuan Huang,Dawei Lou,et al. Needle trap extraction for GC analysis of formic and acetic acids in aqueous solution[J]. Journal of Separation Science,2012,35(13):1675-1681.
APA	Xinqing Lee,Daikuan Huang,Dawei Lou,&Janusz Pawliszyn.(2012).Needle trap extraction for GC analysis of formic and acetic acids in aqueous solution.Journal of Separation Science,35(13),1675-1681.
MLA	Xinqing Lee,et al."Needle trap extraction for GC analysis of formic and acetic acids in aqueous solution".Journal of Separation Science 35.13(2012):1675-1681.

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