Reactions at the mineral – water interface play a central role in environmental processes. Most studies are focused on probing ideally flat surfaces in the presence of bulk solution to emphasize the intrinsic reactivity of these systems. In natural environments, chemical reactions may occur in interconnected pore space, where the mineral-water interactions are controlled by advective-diffusive transport under fluid saturated conditions. Effect of fluid flow on reactive transport is a well-known phenomenon. However, reactivity of minerals under advection dominated conditions is not well studied. Here we present the effects of fluid flow on chemical and structural changes at the calcite (104) and gypsum (010) surfaces as a function of reaction progress using a novel microfluidic channel apparatus. A series of experiments were conducted using a microfluidic cell attached directly to the calcite (104) and gypsum (010) surfaces to assess surface reactivity under dynamic flow conditions. These minerals were reacted at room temperature with a dilute Pb2+ solution under far-from equilibrium conditions over a range of ionic strength. These confined microfluidic environments enable us to precisely control initial fluid composition and fluid velocity within the microfluidic channels. We observed that variations in flow rate and ionic strength affect the substrate dissolution rate and the distribution and morphology of secondary Pb-bearing precipitates within the flow channels. Understanding these effects will enable us to develop a predictive understanding of emergent phenomena in geochemical reactive transport processes involving metal-carbonates and -sulfates

Heterogeneities at confined mineral-water interfaces driven by advective reactive transport

Macromolecular Chemistry: The Second Century

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ACS Spring 2020 National Meeting & Expo

The official archive and repository for all ACS Meetings & Expositions abstracts and select posters or presentations.