DOE PAGES title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Acid Erosion of Carbonate Fractures and Accessibility of Arsenic-Bearing Minerals: In Operando Synchrotron-Based Microfluidic Experiment

Journal Article · · Environmental Science and Technology
ORCiD logo [1];  [2];  [3];  [4]; ORCiD logo [4]
  1. Energy Geosciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States
  2. Columbia Electrochemical Energy Center, Columbia University, New York, New York 10027, United States
  3. Photon Sciences Department, Brookhaven National Laboratory, Upton, New York 11973, United States
  4. Department of Civil and Environmental Engineering, Princeton University, Princeton, New Jersey 08544, United States

Underground flows of acidic fluids through fractured rock can create new porosity and increase accessibility to hazardous trace elements such as arsenic. In this study, we developed a custom microfluidic cell for an in operando synchrotron experiment using X-ray attenuation. The experiment mimics reactive fracture flow by passing an acidic fluid over a surface of mineralogically heterogeneous rock from the Eagle Ford shale. Over 48 h, calcite was preferentially dissolved, forming an altered layer 200–500 μm thick with a porosity of 63–68% and surface area >10$$\times$$ higher than that in the unreacted shale as shown by xCT analyses. Calcite dissolution rate quantified from the attenuation data was 3 $$\times$$ 10–4 mol/m2s and decreased to 3 $$\times$$ 10–5 mol/m2s after 24 h because of increasing diffusion limitations. Erosion of the fracture surface increased access to iron-rich minerals, thereby increasing access to toxic metals such as arsenic. Quantification using XRF and XANES microspectroscopy indicated up to 0.5 wt % of As(-I) in arsenopyrite and 1.2 wt % of As(V) associated with ferrihydrite. This study provides valuable contributions for understanding and predicting fracture alteration and changes to the mobilization potential of hazardous metals and metalloids.

Sponsoring Organization:
National Science Foundation (NSF); USDOE Laboratory Directed Research and Development (LDRD) Program; USDOE Office of Science (SC), Basic Energy Sciences (BES). Chemical Sciences, Geosciences, and Biosciences Division
Grant/Contract Number:
SC0012704; AC02-05CH11231; AC02-98CH10886; AC02-06CH11357; FG02-94ER14466
OSTI ID:
1658975
Alternate ID(s):
OSTI ID: 1766130; OSTI ID: 1767233; OSTI ID: 1659694; OSTI ID: 1670688
Journal Information:
Environmental Science and Technology, Journal Name: Environmental Science and Technology Journal Issue: 19 Vol. 54; ISSN 0013-936X
Publisher:
American Chemical Society (ACS)Copyright Statement
Country of Publication:
United States
Language:
English

References (50)

On mobilization of lead and arsenic in groundwater in response to CO2 leakage from deep geological storage journal November 2009
ATHENA , ARTEMIS , HEPHAESTUS : data analysis for X-ray absorption spectroscopy using IFEFFIT journal June 2005
Modifications of Carbonate Fracture Hydrodynamic Properties by CO 2 -Acidified Brine Flow journal April 2013
Modeling Reactive Transport Processes in Fractures journal September 2019
Release of Particulate Iron Sulfide during Shale-Fluid Interaction journal December 2017
Influence of Rock Mineralogy on Reactive Fracture Evolution in Carbonate-Rich Caprocks journal August 2018
3D Mapping of calcite and a demonstration of its relevance to permeability evolution in reactive fractures journal September 2016
Arsenic mobility and impact on recovered water quality during aquifer storage and recovery using reclaimed water in a carbonate aquifer journal December 2011
Review: Role of chemistry, mechanics, and transport on well integrity in CO2 storage environments journal June 2016
Simulation of mineral dissolution at the pore scale with evolving fluid-solid interfaces: review of approaches and benchmark problem set journal January 2020
A 2.5D Reactive Transport Model for Fracture Alteration Simulation journal July 2016
Caprock Fracture Dissolution and CO2 Leakage journal January 2013
A microfluidic device and automatic counting system for the study of C. elegans reproductive aging journal January 2015
Investigation on arsenopyrite dissolution and As (III) migration under geologic carbon storage conditions: A numerical simulation approach: Original Research Article: Investigation on arsenopyrite dissolution and As (III) migration under geologic carbon storage conditions journal December 2016
Droplet fragmentation: 3D imaging of a previously unidentified pore-scale process during multiphase flow in porous media journal February 2015
Deterioration of a fractured carbonate caprock exposed to CO 2 -acidified brine flow : Deterioration of a fractured carbonate caprock exposed to CO journal August 2011
Nanospectroscopy Captures Nanoscale Compositional Zonation in Barite Solid Solutions journal August 2018
Wettability Phenomena at the CO 2 –Brine–Mineral Interface: Implications for Geologic Carbon Sequestration journal August 2012
Microfluidic Study of Fracture Dissolution in Carbonate-Rich Caprocks Subjected to CO 2 -Charged Brine journal December 2019
Alkali and alkaline earth metal chloride solutions influence sulfide mineral dissolution journal September 2015
Geo-material microfluidics at reservoir conditions for subsurface energy resource applications journal January 2015
Impact of coating development on the hydraulic and transport properties in argillaceous limestone fracture: DISSOLUTION IN ARGILLACEOUS LIMESTONE FRACTURE journal September 2007
(Micro)spectroscopic Analyses of Particle Size Dependence on Arsenic Distribution and Speciation in Mine Wastes journal August 2013
Quantifying micron-scale grain detachment during weathering experiments on limestone journal January 2016
Chip-off-the-old-rock: the study of reservoir-relevant geological processes with real-rock micromodels journal January 2014
Speciation of Selenium, Arsenic, and Zinc in Class C Fly Ash journal July 2011
Impact of image resolution on quantification of mineral abundances and accessible surface areas journal September 2019
Spontaneous imbibition of water and determination of effective contact angles in the Eagle Ford Shale Formation using neutron imaging journal October 2017
Surface Complexation of Ferrous Iron and Carbonate on Ferrihydrite and the Mobilization of Arsenic journal July 2002
Evolution of planar fractures in limestone: The role of flow rate, mineral heterogeneity and local transport processes journal October 2018
Unexpected trapping of particles at a T junction journal March 2014
Water Chemistry Impacts on Arsenic Mobilization from Arsenopyrite Dissolution and Secondary Mineral Precipitation: Implications for Managed Aquifer Recharge journal March 2014
Pore-scale numerical investigation of the impacts of surface roughness: Upscaling of reaction rates in rough fractures journal October 2018
Permeability evolution due to dissolution and precipitation of carbonates using reactive transport modeling in pore networks: Permeability evolution due to reaction of carbonates journal September 2013
An Evaluation of Water Quality in Private Drinking Water Wells Near Natural Gas Extraction Sites in the Barnett Shale Formation journal August 2013
Multi-scale Model of Reactive Transport in Fractured Media: Diffusion Limitations on Rates journal March 2019
Observations of the impact of rock heterogeneity on solute spreading and mixing journal June 2017
Larch: An Analysis Package for XAFS and Related Spectroscopies journal April 2013
Influence of the flow rate on dissolution and precipitation features during percolation of CO2-rich sulfate solutions through fractured limestone samples journal October 2015
Development of scaling parameters to describe CO2–rock interactions within Weyburn-Midale carbonate flow units journal June 2013
Pore-Scale Study of Transverse Mixing Induced CaCO 3 Precipitation and Permeability Reduction in a Model Subsurface Sedimentary System journal October 2010
Collapse of Reacted Fracture Surface Decreases Permeability and Frictional Strength journal December 2019
Non-Darcy interfacial dynamics of air-water two-phase flow in rough fractures under drainage conditions journal July 2017
Aqueous phase arsenic in weathered shale enriched in native arsenic journal November 2005
Alteration and Erosion of Rock Matrix Bordering a Carbonate-Rich Shale Fracture journal July 2017
Pore-scale study of dissolution-induced changes in hydrologic properties of rocks with binary minerals journal December 2014
Fluid flow and reactive transport around potential nuclear waste emplacement tunnels at Yucca Mountain, Nevada journal April 2003
Mobilisation of arsenic, selenium and uranium from Carboniferous black shales in west Ireland journal October 2019
Capillary tension and imbibition sequester frack fluid in Marcellus gas shale journal December 2012
Toward Reservoir-on-a-Chip: Fabricating Reservoir Micromodels by in Situ Growing Calcium Carbonate Nanocrystals in Microfluidic Channels journal August 2017