Impact process of the aquitard to regional arsenic accumulation of the underlying aquifer in Central Yangtze River Basin
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REVIEW PAPER
Impact process of the aquitard to regional arsenic accumulation of the underlying aquifer in Central Yangtze River Basin Cong Xiao . Teng Ma Juan Chen
. Yao Du . Yanjun Liu . Rui Liu . Dongtao Zhang .
Received: 4 November 2019 / Accepted: 12 February 2020 Ó Springer Nature B.V. 2020
Abstract The clayey aquitard has the potential to release geogenic poisonous chemicals such as arsenic (As) to the adjacent aquifer owing to complex hydrologic or biogeochemical processes. However, it remains unclear whether the aquitard has effect on As enrichment in the underlying aquifer in regions without extensive groundwater pumping, and the related processes have been poorly known. Based on piezometer water chemistry, stable water isotopes, sediment chemistry and reactive-transport model, this study aims to reveal the impact process of the aquitard to As accumulation of underlying aquifer from central Yangtze River Basin, a As-affected area without extensive groundwater pumping. On the whole, As migrated from top to bottom of the aquitard (especially the depth over 10 m) and significantly influenced the
Electronic supplementary material The online version of this article (https://doi.org/10.1007/s10653-020-00541-2) contains supplementary material, which is available to authorized users. C. Xiao T. Ma (&) Y. Du Y. Liu R. Liu D. Zhang J. Chen School of Environmental Studies, China University of Geosciences, Lumo Road 388, Wuhan 430074, China e-mail: [email protected]; [email protected] C. Xiao T. Ma Y. Du Y. Liu R. Liu D. Zhang J. Chen State Key Laboratory of Biogeology and Environmental Geology, China University of Geosciences, Wuhan 430074, China
As accumulation in the underlying aquifer. Nonetheless, the results of three topical boreholes showed two different hydrogeological conditions affected As release in the aquitard and enrichment in the underlying aquifer. Different hydrogeological conditions could result in the input of different species organic carbon and then impact As concentrations in the aquifer. When the aquitard was near surface water bodies, the reductive dissolution of iron oxides was the main driver for As release and the aquitard had a significant influence on the enrichment of arsenic in the aquifer. At areas without surface water bodies nearby, the desorption of As(V) from minerals was the main source of As and the concentrations of As in pore water were quite low; this pattern had little effect on the enrichment of arsenic in the aquifer. Keywords Arsenic Aquitard Piezometer water Sediment Jianghan Plain
Introduction Quaternary aquifer, as main sources of groundwater resources in plain areas, is generally under the protection of the overlying clayey aquitard. Many studies have shown that the clayey aquitard is capable of preventing pollutant migration into underlying aquifer owing to the low hydraulic conductivity (Hendry and Wassenaar 2011; Hiscock et al. 2011;
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Environ Geochem Health
Deng et al. 2014
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