Arsenic mobilization in shallow aquifers due to CO2 intrusion from storage reservoirs

Xiao, Ting; Dai, Zhenxue; Viswanathan, Hari S.; Hakala, Alexandra; Cather, Martha; Jia, Wei; Zhang, Yongchao; McPherson, Brian

doi:10.1038/s41598-017-02849-z

Title: Arsenic mobilization in shallow aquifers due to CO₂ intrusion from storage reservoirs

Journal Article · Mon Jun 05 00:00:00 EDT 2017 · Scientific Reports

DOI:https://doi.org/10.1038/s41598-017-02849-z· OSTI ID:1369173

Xiao, Ting ^[1];

^[1];

^[1]; Hakala, Alexandra ^[2]; Cather, Martha ^[3]; Jia, Wei ^[4]; Zhang, Yongchao ^[1]; McPherson, Brian ^[4]

Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
National Energy Technology Lab. (NETL), Pittsburgh, PA, (United States)
New Mexico Inst. of Mining and Technology, Socorro, NM (United States)
Univ. of Utah, Salt Lake City, UT (United States)

We developed an integrated framework of combined batch experiments and reactive transport simulations to quantify water-rock-CO₂ interactions and arsenic (As) mobilization responses to CO₂ and/or saline water leakage into USDWs. Experimental and simulation results suggest that when CO₂ is introduced, pH drops immediately that initiates release of As from clay minerals. Calcite dissolution can increase pH slightly and cause As re-adsorption. Thus, the mineralogy of the USDW is ultimately a determining factor of arsenic fate and transport. Salient results suggest that: (1) As desorption/adsorption from/onto clay minerals is the major reaction controlling its mobilization, and clay minerals could mitigate As mobilization with surface complexation reactions; (2) dissolution of available calcite plays a critical role in buffering pH; (3) high salinity in general hinders As release from minerals; and (4) the magnitude and quantitative uncertainty of As mobilization are predicated on the values of reaction rates and surface area of calcite, adsorption surface areas and equilibrium constants of clay minerals, and cation exchange capacity. Results of this study are intended to improve ability to quantify risks associated with potential leakage of reservoir fluids into shallow aquifers, in particular the possible environmental impacts of As mobilization at carbon sequestration sites.

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Research Organization:: Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: AC52-06NA25396

OSTI ID:: 1369173

Report Number(s):: LA-UR-16-28763

Journal Information:: Scientific Reports, Vol. 7, Issue 1; ISSN 2045-2322

Publisher:: Nature Publishing GroupCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 22 works

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54 ENVIRONMENTAL SCIENCES
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Title: Arsenic mobilization in shallow aquifers due to CO2 intrusion from storage reservoirs

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Title: Arsenic mobilization in shallow aquifers due to CO₂ intrusion from storage reservoirs