Aquatic Geochemistry

, Volume 15, Issue 3, pp 391–419 | Cite as

Photoreduction of Fe(III) in the Acidic Mine Pit Lake of San Telmo (Iberian Pyrite Belt): Field and Experimental Work

  • M. Diez Ercilla
  • E. López Pamo
  • J. Sánchez España
Original Paper
First Online:
Received:
Accepted:

Abstract

Light-induced reduction of dissolved and particulate Fe(III) has been observed to occur in the surface waters of the acidic mine pit lake of San Telmo (143,600 m2, pH 2.8, Fetotal = 2.72 mM). This photochemical production of Fe(II) is directly related to the intensity of solar radiation and competes with biologically catalyzed reactions (i.e., bacterial re-oxidation of Fe(II)) and physical processes (including ionic diffusion, advection, and convection, which tend to homogenize the epilimnetic concentration of Fe(II) at every moment). Therefore, diel cycles of Fe(II) concentration are observed at the lake surface, with minimum values of 10–20 μM Fe(II) (0.35–0.70% Fetotal) at the sunrise and sunset, and maximum values of 90 μM Fe(II) (3.2% Fetotal) at midday in August 2005. Field and experimental work conducted in San Telmo and other pit lakes of the Iberian Pyrite Belt (IPB) (pH 2.3–3.1, Fetotal = 0.34–17 mM) indicate that the kinetics of the photoreductive reaction is zero-order and is independent of the Fe(III) concentration, but highly dependent on the intensity of solar radiation and temperature. Experimental work conducted with natural Fe(III) minerals (schwertmannite, goethite, and lepidocrocite) suggests that dissolved organic matter is an important factor contributing to the photochemical production of Fe(II). The wavelengths involved in the photoreduction of Fe(III) include not only the spectrum of UV-A radiation (315–400 nm), but also part of the photosynthetically active radiation (PAR, 400–700 nm). This finding is of prime importance for the understanding of the photoreduction processes in the pit lakes of the IPB, because the photo-reactive depth is not limited to the penetration depth of UV-A radiation (upper 1–10 cm of the water column depending on the TDS content), but it is approximately equal to the penetration depth of PAR (e.g., first 4–6 m of the water column in San Telmo on July 2007); thus, increasing the importance of photochemical processes in the hydro(bio)geochemistry of pit lakes.

Keywords

Photoreduction Fe(III) Fe(II) UV-A PAR Pit lake Colloids Schwertmannite AMD 
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Notes

Acknowledgement

The present work was funded by the Geological Survey of Spain (IGME) through a research grant to MDE. The authors wish to thank Jesús Reyes for his help during the laboratory experiments. We greatly appreciate the detailed and constructive comments made by Christopher Gammons on a previous version of this manuscript, which helped to improve the quality of the article, and also the editorial comments made by George W. Luther.

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Copyright information

© Springer Science+Business Media B.V. 2008

Authors and Affiliations

  • M. Diez Ercilla
    • 1
  • E. López Pamo
    • 1
  • J. Sánchez España
    • 1
  1. 1.Instituto Geológico y Minero de España (IGME)MadridSpain

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