期刊
CHEMOSPHERE
卷 154, 期 -, 页码 367-374出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.chemosphere.2016.03.124
关键词
DGT-Labile species; DOM; High resolution mass spectrometry; PARAFAC; Vanadium
资金
- NSERC
- Churchill Northern Study Center (CNSC)
- Canada Research Chair program
Diffusive gradients in thin films (DGT) devices were used to investigate the temporal and spatial changes in vanadium (V) speciation in the Churchill estuary system (Manitoba). Thirty-six DGT sets and 95 discrete water samples were collected at 8 river and 3 estuary sites during spring freshet and summer base flow. Dissolved V concentration in the Churchill River at summer base flow was approximately 5 times higher than those during the spring high flow (27.3 +/- 18.9 nM vs 4.8 +/- 3.5 nM). DGT-labile V showed an opposite trend with greater values found during the spring high flow (2.6 +/- 1.8 nM vs 1.4 +/- 03 nM). Parallel factor analysis (PARAFAC) conducted on 95 excitation-emission matrix spectra validated four humic-like (C1-C4) and one protein-like (C5) fluorescent components. Significant positive relationship was found between protein-like DOM and DGT-labile V (r = 0.53, p < 0.05), indicating that protein-like DOM possibly affected the DGT-labile V concentration in Churchill River. Sediment leachates were enriched in DGT-labile V and protein-like DOM, which can be readily released when river sediment began to thaw during spring freshet. (C) 2016 Elsevier Ltd. All rights reserved.
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