Journal Title
Title of Journal: Environ Geol
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Abbravation: Environmental Geology
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Publisher
Springer Berlin Heidelberg
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Authors: M Chitsazan M S Dorraninejad A Zarasvandi S Y Mirzaii
Publish Date: 2008/09/27
Volume: 58, Issue: 4, Pages: 727-737
Abstract
Groundwater in some deep wells of Maydavood aquifer southwestern Iran contains relatively high concentrations of arsenic Detailed hydrochemical analysis of these groundwaters with ICPOES instrument showed that concentrations of iron manganese nickel and vanadium are also high in them and concentrations of total arsenic in 81 of deep wells are greater than World Health Organization’s permissible value 10 ppb XRF analysis of surrounding geological formations and aquifer sediments proposed that original source of arsenic in aquifer material can be attributed to minerals from Asmari Formation It appears that a key mechanism for arsenic mobilizing to deep wells is microbial biodegradation of petroleum related organic matters PROMs which exist in aquifer sediments and originates from the bedrock of the aquifer Gachsaran Formation This process is followed by microbially mediated reductive dissolution of arsenicbearing iron/manganese oxyhydroxides/oxides and further by nickel and vanadium mobilizing to groundwater According to hydrogeochemical conditions and cluster analysis water wells in Maydavood aquifer are divided to four subgroups the wells with mildly reducing condition subgroup I moderately reducing condition subgroup II reducing condition subgroup III and high reducing condition subgroup IV Affected wells to arsenic are belonged to subgroups III and IVThe author thanks to office of vicechancellor for research and technology of Shahid Chamran University Ahvaz Iran for their supports and providing grant No 28223 Also we appreciatively thank the reviewers who provided thoughtful and detailed comments that greatly improved the final manuscript
Keywords:
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