The influence of nitrate on selenium in irrigated agricultural groundwater systems

Journal of Environmental Quality
Ryan T BaileyTimothy K Gates

Abstract

Selenium (Se) contamination of groundwater is an environmental concern especially in areas where aquifer systems are underlain by Se-bearing geologic formations such as marine shale. This study examined the influence of nitrate (NO₃) on Se species in irrigated soil and groundwater systems and presents results from field and laboratory studies that further clarify this influence. Inhibition of selenate (SeO₄) reduction in the presence of NO₃ and the oxidation of reduced Se from shale by autotrophic denitrification were investigated. Groundwater sampling from piezometers near an alluvium-shale interface suggests that SeO₄ present in the groundwater was due in part to autotrophic denitrification. Laboratory shale oxidation batch studies indicate that autotrophic denitrification is a major driver in the release of SeO₄ and sulfate. Similar findings occurred for a shale oxidation flow-through column study, with 70 and 31% more reduced Se and S mass, respectively, removed from the shale material in the presence of NO₃ than in its absence. A final laboratory flow-through column test was performed with shallow soil samples to assess the inhibition of SeO₄ reduction in the presence of NO₃, with results suggesting that a concentration of...Continue Reading

References

Sep 1, 1999·Biological Trace Element Research·A StorkW T Frankenberger
Oct 3, 1999·Applied and Environmental Microbiology·R S OremlandJ F Stolz
Sep 25, 2001·BioFactors·W T Frankenberger, M Arshad
Dec 24, 2002·International Microbiology : the Official Journal of the Spanish Society for Microbiology·J F StolzR S Oremland
Mar 1, 2008·Ground Water·P B McMahon, F H Chapelle
Jun 26, 2009·Environmental Geochemistry and Health·Mustafa Al Kuisi, Ahmad Abdel-Fattah
Oct 31, 2009·Journal of Environmental Quality·Timothy K GatesJennifer Mueller Price

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Citations

Jan 15, 2014·Environmental Monitoring and Assessment·D A DevittE Hausrath
Apr 16, 2013·Journal of Contaminant Hydrology·Ryan T BaileyArdell D Halvorson
Jul 16, 2015·Environmental Science & Technology·Kathrin SchillingPaul R D Mason
Jan 16, 2015·Journal of Environmental Management·Charlotte L JohanssonDavid A Roberts
Mar 26, 2021·Journal of Contaminant Hydrology·Julie GeselsSerge Brouyère
Oct 19, 2021·Journal of Environmental Quality·Y PachepskyW Zhang

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