Comparison between DAX-8 and C-18 solid phase extraction of rainwater dissolved organic matter

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• 作者：Patrí ; cia S.M. Santos ; Marta Otero ; Olga M.S. Filipe ; Eduarda B.H. Santos ; Arm ; o C. Duarte
• 关键词：Rainwater ; DOM ; DAX-8 resin ; C-18 sorbent ; UV– ; visible spectroscopy ; Fluorescence spectroscopy
• 刊名：Talanta
• 出版年：2010
• 出版时间：15 December 2010
• 年：2010
• 卷：83
• 期：2
• 页码：505-512
• 全文大小：415 K

文摘

Rainwater is a very low concentrated matrix and, for dissolved organic matter (DOM) characterization, an efficient extraction procedure is essential. Isolation procedures based on the adsorption onto XAD-8 and C-18 sorbents have been used in the literature for rainwater DOM isolation, but a comparison between these procedures is lacking. In this work, UV–visible and molecular fluorescence spectroscopies highlighted differences between rainwater DOM isolated by DAX-8 (replacement for XAD-8) and by C-18. It was possible to recover higher rainwater DOM percentage by the C-18 based procedure than by the DAX-8 one. Rainwater protein-like compounds were better concentrated by the C-18 procedure than by the DAX-8 one, while humic-like compounds were similarly concentrated by both procedures. Furthermore, rainwater DOM extracted by the C-18 procedure was more representative of the global matrix, while DAX-8 preferentially extracted humic-like compounds.