Nonmonotonic Coupled Dissolution‐Precipitation Reactions at the Mineral–Water Interface

Dissolution is inherent to fluid-mineral systems. Yet its impact on minerals reacting with electrolytes overlooked. Here, a novel nonmonotonic behavior for the surface interactions of carbonates (calcite and Mg-calcite) organic acids reported. Applying bioinspired approach, Mg-calcite sensors via amorphous precursors, avoiding any preconditioning functional groups are synthesized. A quartz crystal microbalance used study mass changes mineral contact under varying ionic conditions, temperatures, flow velocities. Supported by confocal Raman microscopy potentiometric titrations, nonmonotonous developments found as function Ca2+ concentration flowrate, attributed three coupled chemical reactions: i) carbonate dissolution ion complexation molecules, formation organo-calcium compounds ii) phase at mineral–water interface, iii) particles in bulk fluid. These processes depend local contents precipitation onset (i.e., saturation index) salts, both which substantially differ fluid boundary layer interfaces. This continuum between provides conceptual framework address reactions interfacial across disciplines including biomineralization, ocean acidification reservoir geochemistry.