Abstract This study examines siderite (FeCO 3 ) reactivity in MgCl 2 and MgSO 4 brines with varying salt concentrations (0.01M, 1M, 3M) at both acidic (pH ∼ pH ≤ 2) near-neutral 7) conditions. We measured aqueous Fe through time to determine dissolution rates characterized the solid reaction products scanning electron microscopy, dispersive X-ray spectroscopy, Raman spectroscopy. Iron-based wer...