Forsberg,L.S., Kleja,D.B., Greger,M. and Ledin,S.(2009): Effects of sewage sludge on solution chemistry and plant uptake of Cu in sulphide mine tailings at different weathering stages. Applied Geochemistry, 24, 475-482.

『異なる風化段階での硫化物鉱山尾鉱中の銅の溶液化学と植物摂取に対する汚泥の影響』


Abstract
 This climate chamber experiment examines the effects of sewage sludge (SS) on sulphide mine tailings from the Aitik Cu mine in northern Sweden. The effects of SS were determined from Cu in solution and Cu uptake and growth of plants on tailings showing 3 different degrees of weathering. Possible relationships between Cu content in plants and Cu in solution measured in tailings (total dissolved Cu and free Cu) were also evaluated. Red fescue (Festuca rubra) was grown for 6 weeks in pots of the different tailings treated with SS or NPK fertiliser. Soil solution was sampled with Rhizon tension lysimeters and analysed for pH, dissolved organic C (DOC), free Cu, total dissolved Cu and SO42-. The effects of SS on Cu in solution and plants depended on the degree of weathering. In tailings with a low degree of sulphide oxidation, SS application resulted in increased solubility and shoot accumulation of Cu compared with NPK-treated tailings, probably due to DOC forming soluble complexes with Cu. Sewage sludge also seemed to promote translocation of Cu to shoots in those tailings. In highly weathered tailings, lower contents of total dissolved Cu and free cu in solution and lower Cu levels in shoots were found in SS-treated samples than in NPK-treated. In the moderately weathered tailings, Cu concentrations in solutions were generally similar between treatments, but lower contents of Cu were found in shoots and roots of the fescue grown in the SS-treatment. Irrespective of degree of weathering and treatment, both free Cu and total dissolved Cu concentration in tailings correlated strongly with Cu levels found in fescue shoots.』

1. Introduction
2. Material and methods
 2.1. Properties of tailings and sewage sludge
 2.2. Preparation and properties of A, B1 and B2 tailings
 2.3. Layout of climate chamber experiment
 2.4. Sampling and analyses
 2.5. Statistical analysis
3. Results
 3.1. Solution chemistry
 3.2. Growth and Cu content of plants
4. Discussion
5. Conclusion
Acknowledgements
References


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