期刊
GEOCHIMICA ET COSMOCHIMICA ACTA
卷 171, 期 -, 页码 156-173出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.gca.2015.08.025
关键词
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资金
- Australian Research Council, Australia [LP0884103]
- Dr. Nigel Radford and Newmont Mining Corporation
- Sven Fjastad and TSW Analytical Pty. Ltd (Perth)
- Australian Research Council [LP0989547]
- National Centre for Groundwater Research and Training, an Australian government initiative by by the Australian Research Council [SR0800001]
- National Water Commission, Australia
- Australian Research Council [LP0989547, LP0884103] Funding Source: Australian Research Council
This study reports the first surface water evaluation of the temporal and spatial variability of Au in an estuary, using recently developed modifications to the diffusive gradients in thin films (DGT) and grab sampling techniques. At the two study sites in the Swan River estuary that were more marine in character, the DGT-measured concentrations of Au (26.3 and 31.3 ng/L) were within the range of total concentrations measured on individual days (13.2-30.6 ng/L and 11.2-37.2 ng/L, respectively). In contrast, at an upstream site, Au concentrations measured by DGT were significantly lower than totals (3.9 ng/L for DGT, compared with 13.2-28.8 ng/L for grab sampling), likely due to either size exclusion of colloids (>70 nm) by DGT or formation of a dissolved, non-DGT-labile Au species (<0.45 mu m). DGT-measured concentrations of other metals (Cu, Co, Cr, U, V, Mo and As) were also lower than total concentrations, although in contrast to DGT-measured Au, this phenomenon occurred at all sites. Furthermore, daily grab samples for Au, taken over the 10-day deployment (which included a rain event), showed that Au concentrations could spike substantially (from 15.1 ng/L to 37.2 ng/L) over intervals as short as one day. The combination of simultaneous deployment of different DGT devices and grab sampling represents a new development in efforts to understand the transport and fate of Au together with other elements in dynamic environments such as estuaries. (C) 2015 Elsevier Ltd. All rights reserved.
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