Development of solid-phase microextraction to study dissolved organic matter鈥擯olycyclic aromatic hydrocarbon interactions in aquatic environment

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• 作者：Chlo茅 de Perre ; Karyn Le M茅nach ; Fabienne Ibalot ; Edith Parlanti ; H茅l猫ne Budzinski
• 关键词：Solid-phase microextraction ; Gas chromatography&ndash ; mass spectrometry ; Polycyclic aromatic hydrocarbons ; Dissolved organic matter ; Interactions ; Aquatic environment
• 刊名：Analytica Chimica Acta
• 出版年：7 January, 2014
• 年：2014
• 卷：807
• 期：Complete
• 页码：51-60
• 全文大小：896 K

文摘

Solid-phase microextraction coupled with gas chromatography and mass spectrometry (SPME-GC-MS) was developed for the study of interactions between polycyclic aromatic hydrocarbons (PAHs) and dissolved organic matter (DOM). After the determination of the best conditions of extraction, the tool was applied to spiked water to calculate the dissolved organic carbon water distribution coefficient (K_DOC) in presence of different mixtures of PAHs and Aldrich humic acid. The use of deuterated naphthalene as internal standard for freely dissolved PAH quantification was shown to provide more accuracy than regular external calibration. For the first time, K_DOC values of 18 PAHs were calculated using data from SPME-GC-MS and fluorescence quenching; they were in agreement with the results of previous studies. Competition between PAHs, deuterated PAHs and DOM was demonstrated, pointing out the non-linearity of PAH-DOM interactions and the stronger interactions of light molecular weight PAHs (higher K_DOC values) in absence of high molecular weight PAHs.