溶解有机碳
化学
固相萃取
吸附剂
傅里叶变换离子回旋共振
质谱法
吸附
浸出(土壤学)
洗脱
萃取(化学)
色谱法
环境化学
吸附
土壤水分
有机化学
地质学
土壤科学
作者
Yan Li,Mourad Harir,Jenny Uhl,Basem Kanawati,Marianna Lucio,Kirill S. Smirnov,Boris P. Koch,Philippe Schmitt‐Kopplin,Norbert Hertkorn
出处
期刊:Water Research
[Elsevier]
日期:2017-06-01
卷期号:116: 316-323
被引量:101
标识
DOI:10.1016/j.watres.2017.03.038
摘要
Solid phase extraction (SPE) has become a widespread method for isolating dissolved organic matter (DOM) of diverse origin such as fresh and marine waters. This study investigated the DOM extraction selectivity of 24 commercially available SPE sorbents under identical conditions (pH = 2, methanol elution) on the example of Suwannee River (SR) water and North Sea (NS) water by using DOC analysis and Fourier transform ion cyclotron resonance mass spectrometry (FT-ICR MS). Proton nuclear magnetic resonance (1H NMR) spectroscopy was employed to assess leaching behavior, and HLB sorbent was found to leach substantially, among others. Variable DOC recoveries observed for SR DOM and NS DOM were primarily caused by the respective molecular composition, with subordinated and heterogeneous contributions of relative salinity. Scatter of average H/C and O/C elemental ratios and gross alignment in mass-edited H/C ratios according to five established coarse SPE characteristics was near identical for SR DOM and NS DOM. FTMS-based principal component analysis (PCA) provided essentially analogous alignment of SR DOM and NS DOM molecular compositions according to the five established groups of SPE classification, and corroborated the sorption-mechanism-based selectivity of DOM extraction in both cases. Evaluation of structural blanks and leaching of SPE cartridges requires NMR spectroscopy because FT-ICR mass spectrometry alone will not reveal inconspicuous displacements of continual bulk signatures caused by leaching of SPE resin constituents.
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