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Li, Y. ; Harir, M. ; Lucio, M. ; Kanawati, B. ; Smirnov, K. ; Flerus, R.* ; Koch, B.P.* ; Schmitt-Kopplin, P. ; Hertkorn, N.

Proposed guidelines for solid phase extraction of Suwannee River dissolved organic matter.

Anal. Chem. 88, 6680-6688 (2016)
Publ. Version/Full Text Postprint DOI
Open Access Green
This paper proposes improved guidelines for dissolved organic matter (DOM) isolation by solid phase extraction (SPE) with a styrene-divinylbenzene copolymer (PPL) sorbent, which has become an estab-lished method for the isolation of DOM from natural waters due to its ease of application and apprecia-ble carbon recovery. Suwannee River water was selected to systematically study the effects of critical SPE variables such as loading mass, concentration, flow rate, and up-scaling on the extraction selectivity of the PPL sorbent. High-field Fourier transform ion cyclotron resonance mass spectrometry (FTICR MS) and proton nuclear magnetic resonance (1H NMR) spectroscopy were performed to interpret the DOM chemical space of eluates as well as permeates and wash liquids with molecular resolution. Up to 89% dissolved organic carbon (DOC) recovery was obtained with a DOC/PPL mass ratio of 1:800 at a DOC concentration of 20 mg/L. With the application of larger loading volumes, low quantities of highly oxygenated compounds were retained on the PPL sorbent. The effects of the flow rate on the extraction selectivity of the sorbent were marginal. Up-scaling had a limited effect on the extraction selectivity with the exception of increased self-esterification with a methanol solvent, resulting in methyl ester groups. Furthermore, the SPE/PPL extract exhibited highly authentic characteristics in comparison with original water and reverse osmosis samples. These findings will be useful for reproducibly isolating DOM with representative molecular compositions from various sources and concentrations and mini-mizing potential inconsistencies among interlaboratory comparative studies.
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Publication type Article: Journal article
Document type Scientific Article
Keywords Fticr Mass-spectrometry; Humic Substances; Nmr-spectroscopy; Sample; Ocean; Dom; Chromatography; Carbon; Tools
ISSN (print) / ISBN 0003-2700
e-ISSN 1520-6882
Quellenangaben Volume: 88, Issue: 13, Pages: 6680-6688 Article Number: , Supplement: ,
Publisher American Chemical Society (ACS)
Publishing Place Washington
Reviewing status