A Novel Method for Determination of Low Molecular Weight Dicarboxylic Acids in Background Atmospheric Aerosol Using Ion Chromatography

doi:10.1016/j.aca.2008.07.041

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標題:	A Novel Method for Determination of Low Molecular Weight Dicarboxylic Acids in Background Atmospheric Aerosol Using Ion Chromatography
作者:	Ying I. Tsai Li-Ying Hsieh Tzu-Hsiang Weng Yu-Chien Ma Su-Ching Kuo
貢獻者:	環境工程與科學系醫藥化學系
關鍵字:	Background aerosol Dicarboxylic acids Gradient elution Interference Effect of temperature
日期:	2008-09
上傳時間:	2009-10-05 14:13:10 (UTC+8)
出版者:	Elsevier
摘要:	This paper describes a novel gradient elution ion chromatographic method using a Dionex AS11 system for the determination of low molecular weight dicarboxylic acids (low-Mw DCAs) in background atmospheric aerosol. Interference with the oxalic acid peak from sulfate in background PM2.5 aerosol, 15.8 times the oxalic acid concentration, was remedied by removing sulfate using a barium cartridge, whilst interference with the malonic acid peak from carbonate was reduced by using a carbonate removal device. An alternative remedy to sulfate interference was use of an AS14 system using isocratic eluent, and this produced good resolution of oxalic acid from a high sulfate peak. In both the AS11 and the AS14 system, linear correlation coefficients were at all times >0.9990 with excellent linear range, the recoveries ranged from 92.8 to 106%, with relative standard deviation of 3.67–6.30%, whilst method detection limits (MDLs) ranged from 0.36 μg L−1 for malic acid to 3.87 μg L−1 for maleic acid. These data indicate that the analytical methods developed herein produce excellent separation efficiency and good determination of low-Mw DCAs with satisfactory accuracy, recoveries, and MDLs. Samples left at room temperature (20 °C) for 300 min in a simulation of the ‘waiting time’ involved in the proposed IC analysis decayed to between 86% (oxalic acid) and 39% (succinic and malonic acids) of their original concentration, whilst at 4 °C concentrations remained at 96–101% of original, indicating that maintaining samples at a low temperature prior to injection into the IC analyzer is vital for obtaining accurate results when analyzing low-Mw DCAs. Oxalic acid was found to be the most prevalent low-Mw DCA in background aerosol, comprising 57% of the total low-Mw DCAs and 0.959% of the PM2.5 aerosol mass, followed by succinic acid and malonic acid.
關聯:	Analytica Chimica Acta 626(1)：p.78-88
顯示於類別:	[環境工程與科學系(所)] 期刊論文 [食藥產業暨檢測科技系(含五專)] 期刊論文

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