Processes controlling manganese distributions and associations in organic-rich freshwater aquatic systems: The example of Loch Bradan, Scotland

Recent increases in manganese (Mn) concentrations in surface waters, including drinking water supplies, have triggered renewed interest in its geochemical behaviour in freshwater systems. This study, involving analysis of bottom sediments and ultrafiltered water (stream, loch and sediment porewater)...

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Bibliographic Details
Published in:The Science of the total environment 2012-05, Vol.424, p.239-250
Main Authors: Graham, Margaret C., Gavin, Keith G., Kirika, Alexander, Farmer, John G.
Format: Article
Language:English
Subjects:
Applied sciences
climate change
Colloids
Diffusion
Drinking water
Drinking water and swimming-pool water. Desalination
Earth sciences
Earth, ocean, space
Environmental Monitoring
Exact sciences and technology
freshwater
Geochemistry
Geologic Sediments - analysis
Geologic Sediments - chemistry
Inflow
Lakes - analysis
Lakes - chemistry
Manganese
Manganese - analysis
Manganese - chemistry
Mineralogy
Organic colloids
Outflow
phase transition
Pollution
process control
Resuspension
Rivers - chemistry
Scotland
Sediments
Silicates
Speciation
Spectrophotometry, Atomic
surface water
Water geochemistry
Water Pollutants, Chemical - analysis
Water Pollutants, Chemical - chemistry
water reservoirs
water supply
Water Supply - analysis
water treatment
Water treatment and pollution
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Summary:Recent increases in manganese (Mn) concentrations in surface waters, including drinking water supplies, have triggered renewed interest in its geochemical behaviour in freshwater systems. This study, involving analysis of bottom sediments and ultrafiltered water (stream, loch and sediment porewater) samples, identified changes in aqueous phase speciation of Mn upon entering the loch waters and during its transit from the inflow to the outflow of Loch Bradan, a drinking water reservoir in SW Scotland. Diffusion out of the bottom sediments during calm periods or mixing of porewaters with loch water during resuspension events also released Mn into the overlying waters. Although 65% Mn was in colloidal form (3kDa–0.2μm) in the main streamwater inflow at the western end, 57–66% was present in the
ISSN:0048-9697
1879-1026
DOI:10.1016/j.scitotenv.2012.02.028