E3S Web Conf.
Volume 98, 201916th International Symposium on Water-Rock Interaction (WRI-16) and 13th International Symposium on Applied Isotope Geochemistry (1st IAGC International Conference)
|Number of page(s)||5|
|Section||Modeling of Hydrogeochemical and Ore Formation Processes|
|Published online||07 June 2019|
Arsenic mobilization in the piedmont area of the Hetao basin: an insight from a reactive transport model
State Key Laboratory of Biogeology and Environmental Geology, China University of Geosciences, Beijing 100083, PR China
2 MOE Key Laboratory of Groundwater Circulation and Environmental Evolution & School of Water Resources and Environment, China University of Geosciences (Beijing), Beijing 100083, PR China
* Corresponding author: firstname.lastname@example.org
Groundwater showed a trend from oxic-suboxic conditions in the alluvial fan to anoxic conditions in the flat plain in the Hetao basin, with increases in As, Fe2+, NH4+, alkalinity and pH, and decreases in Eh and NO3-. A 1D reactive transport model was constructed using a model flow column by PHREEQC to quantitatively interpret geochemical processes related to As mobilization in a 5000 m-long hydrogeological unit. Results indicated that groundwater As concentration was mostly controlled by Fe(III) oxide reduction and As adsorption processes. Observed Fe2+ was the combination of Fe(III) oxide reduction and mackinawite/siderite precipitation. Increasing alkalinity was the result of oxidation of organic carbon, rather than the dissolution of carbonates.
© The Authors, published by EDP Sciences, 2019
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