Determination of low-molecular-weight dicarboxylic acids in atmospheric aerosols by injection-port derivatization and gas chromatography-mass spectrometry

Please use this identifier to cite or link to this item: http://ir.lib.ncu.edu.tw/handle/987654321/28275

Title:	Determination of low-molecular-weight dicarboxylic acids in atmospheric aerosols by injection-port derivatization and gas chromatography-mass spectrometry
Authors:	Hsu,CL;Ding,WH
Contributors:	中央大學
Keywords:	VOLUME ONLINE DERIVATIZATION;LIQUID-PHASE MICROEXTRACTION;ENVIRONMENTAL-SAMPLES;WATER SAMPLES;HERBICIDES;DICARBONYLS;KETOACIDS;ISOMERS;AIR
Date:	2009
Issue Date:	2010-06-29 19:45:18 (UTC+8)
Publisher:	化學研究所
Abstract:	A rapid and environmental-friendly injection-port derivatization with gas chromatography-mass spectrometry (GC-MS) method was developed to determine selected low-molecular weight (LMW) dicarboxylic acids (from C2 to C10) in atmospheric aerosol samples. The parameters related to the derivatization process (i.e., type of ion-pair reagent, injection-port temperature and concentration of ion-pair reagent) were optimized. Tetrabutylammonium hydroxide (TBA-OH) 20mM in methanol gave excellent yield for di-butyl ester dicarboxylate derivatives at injection-port temperature at 300 degrees C. Solid-phase extraction (SPE) method instead of rotary evaporation was used to concentrate analytes from filter extracts. The recovery from filter extracts ranged from 78 to 95% with relative standard deviation (RSD) less than 12%. Limits of quantitation (LOQs) ranged from 25 to 250 pg/m(3). The concentrations of di-carboxylated C2-C5 and total C6-C10 in particles of atmospheric aerosols ranged from 91.9 to 240, 11.3 to 56.7,9.2 to 49.2,8.7 to 35.3 and n.d. to 37.8 ng/m(3), respectively. Oxalic acid (C2) was the dominant LMW-dicarboxylic acids detected in aerosol samples. The quantitative results were comparable to the results obtained by the off-line derivatization. (C) 2009 Elsevier B.V. All rights reserved.
Relation:	TALANTA
Appears in Collections:	[Graduate Institute of Chemistry] journal & Dissertation

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