Department of Analytical Chemistry, Chemical Faculty, Gdańsk University of Technology (GUT), 11/12 G. Narutowicza Street, 80-233 Gdańsk, Poland.
Water Sci Technol. 2011;63(4):590-7. doi: 10.2166/wst.2011.204.
This study describes extraction of selected volatile fatty acids (VFAs) (containing from 2 up to 8 carbon atoms) with methyl-tert-butyl ether (MTBE) from polluted aqueous samples followed by separation, identification and quantification by gas chromatography coupled with mass spectrometry (GC-MS). Extraction parameters such as time and number of extractions, volume ratio, effect of acidification and salt addition were optimized with respect to recovery, enrichment factor and repeatability. The VFAs studied were separated using an open tubular capillary column Stabilwax-DA (crossbond polyethylene glycol treated with nitroterephtalic acid). The limits of quantitation (LOQ) of the procedure developed were on the level of 0.1 to 0.5 mg L(-1). The analysis of real samples of municipal raw and treated wastewater, animal farms wastewater, and also landfill leachates showed that always dominant was acetic acid. The content of VFAs in animal farms wastewater was a few times higher than in municipal wastewater and in municipal solid waste landfill leachates. In surface and ground water close to municipal landfill only acetic acid was detected at higher concentrations in outflow than inflow water. This indicates that slight leakage from the landfill must have occurred.
本研究描述了从污染水样中用甲基叔丁基醚（MTBE）提取选定的挥发性脂肪酸（VFA）（含有 2 至 8 个碳原子），然后通过气相色谱-质谱联用（GC-MS）进行分离、鉴定和定量。针对回收率、富集因子和重复性，对提取时间和提取次数、体积比、酸化和加盐的影响等提取参数进行了优化。研究的 VFA 采用开管毛细管柱 Stabilwax-DA（交联聚乙烯乙二醇用硝替邻苯二甲酸处理）进行分离。所开发方法的定量限（LOQ）为 0.1 至 0.5 mg L(-1)。对城市原水和处理水、动物养殖场废水以及垃圾填埋渗滤液的实际样品进行分析表明，乙酸始终是主要成分。动物养殖场废水中 VFA 的含量比城市废水和城市固体废物填埋渗滤液中的 VFA 含量高几倍。在靠近城市垃圾填埋场的地表水和地下水中，流出水中的乙酸浓度高于流入水中，这表明一定程度的垃圾填埋场渗漏已经发生。
