Downstream patterns of bed sediment-borne metals, minerals and organic matter in a stream system receiving acidic mine effluent: a preliminary study

Ma, Yingqun and Lu, Wenzhou and Lin, Chuxia (2011) Downstream patterns of bed sediment-borne metals, minerals and organic matter in a stream system receiving acidic mine effluent: a preliminary study. Journal of Geochemical Exploration, 110 (2). pp. 98-106. ISSN 0375-6742

Abstract

Different downstream variation patterns were observed for a range of bed sediment-borne metals (aqua regia-extractable fraction) in a subtropical stream system receiving acid mine drainage. Mine-originated Fe tended to be deposited in the acidic (mean pH b4.9) upstream reach in forms of goethite and/or hematite. In contrast, other metals tended to be transported farther downstream and settled in a low-gradient reach with high pH (mean pH N5.6). The peak of sediment-borne Al, Be, Ca, Cd, Co, Cu, La, Mn, Ni and Zn corresponded very well with the peak of the sediment-borne organic matter, suggesting a close association between the water-borne organic colloids and the inorganic metal oxides/hydroxides during their transport. The marked increase in the sediment-borne Al and Pb started more upstream than the other metals, suggesting that the water-borne Al and Pb were more susceptible to pH rise-induced precipitation, as compared to the other metals. It appeared that the organic colloids played no important role in Pb transport and settlement. The iron precipitates had a limited role to play in affecting the transport and fates of other metals since they were predominantly formed and deposited in the acidic reach, which made them incapable of scavenging cationic metals by co-precipitation or adsorption.


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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Additional Information: Permanent restrcited access to published version due to pubslisher copyright policy.
Depositing User: Dr Chuxia Lin
Faculty / Department / School: Current - USQ Other
Date Deposited: 22 Aug 2011 06:16
Last Modified: 03 Jul 2013 00:44
Uncontrolled Keywords: streambed sediment; acid mine drainage; heavy metal; spatial variation; mineral; organic matter
Fields of Research (FOR2008): 04 Earth Sciences > 0406 Physical Geography and Environmental Geoscience > 040603 Hydrogeology
04 Earth Sciences > 0403 Geology > 040310 Sedimentology
05 Environmental Sciences > 0502 Environmental Science and Management > 050206 Environmental Monitoring
Socio-Economic Objective (SEO2008): D Environment > 96 Environment > 9609 Land and Water Management > 960908 Mining Land and Water Management
Identification Number or DOI: doi: 10.1016/j.gexplo.2011.04.001
URI: http://eprints.usq.edu.au/id/eprint/19430

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