Affordable Access

Solubilization of manganese and trace metals in soils affected by acid mine runoff.

Authors
  • Green, C H
  • Heil, D M
  • Cardon, G E
  • Butters, G L
  • Kelly, E F
Type
Published Article
Journal
Journal of environmental quality
Publication Date
Jan 01, 2003
Volume
32
Issue
4
Pages
1323–1334
Identifiers
PMID: 12931888
Source
Medline
License
Unknown

Abstract

Manganese solubility has become a primary concern in the soils and water supplies in the Alamosa River basin, Colorado due to both crop toxicity problems and concentrations that exceed water quality standards. Some of the land in this region has received inputs of acid and trace metals as a result of irrigation with water affected by acid mine drainage and naturally occurring acid mineral seeps. The release of Mn, Zn, Ni, and Cu following saturation with water was studied in four soils from the Alamosa River basin. Redox potentials decreased to values adequate for dissolution of Mn oxides within 24 h following saturation. Soluble Mn concentrations were increased to levels exceeding water quality standards within 84 h. Soluble concentrations of Zn and Ni correlated positively with Mn following reduction for all four soils studied. The correlation between Cu and Mn was significant for only one of the soils studied. The soluble concentrations of Zn and Ni were greater than predicted based on the content of each of these metals in the Mn oxide fraction only. Increases in total electrolyte concentration during reduction indicate that this may be the result of displacement of exchangeable metals by Mn following reductive dissolution of Mn oxides.

Report this publication

Statistics

Seen <100 times