期刊
ENVIRONMENTAL CHEMISTRY
卷 7, 期 1, 页码 82-93出版社
CSIRO PUBLISHING
DOI: 10.1071/EN09111
关键词
contaminated sediments; electron microscopy; field flow fractionation; ICPMS
资金
- US Department of Energy [DE-FG02-06ER15786]
- Institute for Critical Technology and Applied Sciences
- National Science Foundation (NSF)
- Environmental Protection Agency through the Center for Environmental Implications of NanoTechnology (CEINT) [EF-0830093]
Analytical transmission electron microscopy (aTEM) and flow field flow fractionation (FlFFF) coupled to multi-angle laser light scattering (MALLS) and high-resolution inductively coupled plasma mass spectroscopy (HR-ICPMS) were utilised to elucidate relationships between trace metals and nanoparticles in contaminated sediment. Samples were obtained from the Clark Fork River (Montana, USA), where a large-scale dam removal project has released reservoir sediment contaminated with toxic trace metals (namely Pb, Zn, Cu and As) which had accumulated from a century of mining activities upstream. An aqueous extraction method was used to recover nanoparticles from the sediment for examination; FlFFF results indicate that the toxic metals are held in the nano-size fraction of the sediment and their peak shapes and size distributions correlate best with those for Fe and Ti. TEM data confirms this on a single nanoparticle scale; the toxic metals were found almost exclusively associated with nano-size oxide minerals, most commonly brookite, goethite and lepidocrocite.
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