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Iron (oxyhydr)oxides may act as a sink and source of arsenic (As) in terrestrial and aquatic systems, therefore studying the mechanisms controlling Fe (oxyhydr)oxide transformation under changing environmental conditions is essential for elucidating the fate of As, in terms of release, mobility and speciation. We provide evidence that aging and As(III) loading control the mineralogical and structural...
Hydroponic and pot experiments were conducted to examine the effects of Fenton reagent on paddy rice plant growing in arsenic-contaminated soils. Fenton reagent significantly reduced arsenic phytotoxicity, uptake by the plants and accumulation in rice grain. This is attributed to oxidation of As3+ to As5+ by hydroxyl radicals and immobilization of arsenate by reacting with precipitating Fe3+ to form...
We review the evidence for a naturally occurring acid sulfate weathering event along the southern shore of Lake Michigan that was initiated ~15,000years BP (before present) at the close of the Wisconsin Glaciation. The evidence includes: (1) “unproductive black soils” that were encountered when settlers drained the wetlands in the area for agriculture, (2) areas of soils that have anomalously low...
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