Acid Erosion of Carbonate Fractures and Accessibility of Arsenic-Bearing Minerals: <i>In Operando</i> Synchrotron-Based Microfluidic Experiment
Hang Deng, Jeffrey P. Fitts, Ryan Tappero, Julie J. Kim, Catherine A. Peters
Abstract
s 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.
Topics & Concepts
ArsenicCarbonateBearing (navigation)SynchrotronErosionEnvironmental chemistryCarbonate mineralsMineralogyMetallurgyEnvironmental scienceGeologyChemistryMining engineeringMaterials scienceGeomorphologyPhysicsGeographyCartographyNuclear physicsCO2 Sequestration and Geologic InteractionsMine drainage and remediation techniquesGroundwater flow and contamination studies