Extraction of formic and acetic acids from aqueous solution by dynamic headspace-needle trap extraction - Temperature and pH optimization
Extraction of formic and acetic acids from aqueous solution by dynamic headspace-needle trap extraction - Temperature and pH optimization
复制标题
DOI：
10.1016/j.chroma.2008.02.066
复制
发表时间：
2008-08-08
影响因子：
4.1
通讯作者：
Pawliszyn, Janusz
中科院分区：
文献类型：
--
作者：
Lou, Da-Wei;Lee, Xinqing;Pawliszyn, Janusz
建立了动态顶空针阱制样和气相色谱法联合测定水溶液中甲酸和乙酸的方法。在气相色谱分析之前，将针萃取装置与气体吸入泵耦合在一起，对水样中的目标化合物进行取样和预浓缩。针阱萃取（NTE）技术允许在动态条件下成功取样短链脂肪酸，同时保持顶空（HS）体积恒定。利用针阱装置对萃取温度和酸化效果两个重要参数进行了优化和评价。尽管甲酸的火焰电离检测响应较低且水溶液中亨利定律常数较低，但该方法对乙酸和甲酸的检出限分别为87.2 μ g/L和234.8 μ g/L。精密度以两个实际样品为基础，范围为4.7 ~ 10.7%。验证的顶空针阱提取方法也成功地应用于几种环境样品。(c) 2008 Elsevier B.V.版权所有
A combined method of dynamic headspace-needle trap sample preparation and gas chromatography for the determination of formic and acetic acids in aqueous solution was developed in this study. A needle extraction device coupled with a gas aspirating pump was intended to perform sampling and preconcentration of target compounds from aqueous sample before gas chromatographic analysis. The needle trap extraction (NTE) technique allows for the successful sampling of short chain fatty acids under dynamic conditions while keeping the headspace (HS) volume constant. Two important parameters, including extraction temperature and effect of acidification, have been optimized and evaluated using the needle trap device. The method detection limits for the compounds estimated were 87.2 mu g/L for acetic acid and 234.8 mu g/L for formic acid in spite of the low flame ionization detection response for formic acid and its low Henry's law constant in aqueous solution. Precision was determined based on the two real samples and ranged between 4.7 and 10.7%. The validated headspace-needle trap extraction method was also successfully applied to several environmental samples. (c) 2008 Elsevier B.V. All rights reserved.