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Geochemical and biological controls on trace metal transport in an acid mine impacted watershed

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Abstract

Water samples collected in an acid mine impacted watershed indicated that the concentrations of dissolved trace metals were diurnally influenced by mineral saturation, which is controlled primarily by pH and water temperature. Measurements taken suggested that these variations only occur at sample locations immediately downstream from the confluence of acidic and alkaline waters. It is at these locations where initial mineral precipitation occurred and where subtle changes in solubility were most affected, increasing trace metal removal when both the rate of photosynthesis (influencing pH in headwaters) and water temperature were at a maximum. The role of iron photoreduction (increased midday production of ferrous iron) on overall Cu, Mn, and Zn transport was also evaluated, but found to be inconclusive. Iron photoreduction may however influence adsorption and/or coprecipitation of trace metals through associated changes in oxidation state, solubility, and mineralogy of various iron colloids, which are produced upon the neutralization of acidic, metal enriched water. Furthermore, measured values of copper and zinc were compared to relative USEPA chronic criterion for exposure to continuous concentration (CCC) of metals by the calculation of a “toxicity unit” (TU). It was found that average values of both copper and zinc only exceeded the CCC (TU>1) in the acid mine-impacted Leona Creek. In general, zinc toxicity decreased while copper toxicity increased downstream of the confluence of the mine impacted Leona Creek and background Lion Creek (sampled at Lake Aliso), indicating a significant source of zinc in upstream, non mine-impacted samples.

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Acknowledgements

I would like to thank the staff of the San Francisco Bay Regional Water Quality Control Board for supporting this research; Peter Husby with the United States Environmental Protection Agency, Region 9; and, Dr. Jeff Seitz, Dr.␣Luther Strayer, and Dr. Joy Andrews.

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Correspondence to Thomas W. Butler II.

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II, T.W.B. Geochemical and biological controls on trace metal transport in an acid mine impacted watershed. Environ Geochem Health 28, 231–241 (2006). https://doi.org/10.1007/s10653-005-9035-8

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  • DOI: https://doi.org/10.1007/s10653-005-9035-8

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