Oxygen isotope systematics in the aragonite–CO2–H2O–NaCl system up to 0.7mol/kg ionic strength at 25°C

To investigate the oxygen isotope systematics in the aragonite–CO2–H2O–NaCl system, witherite (BaCO3) was precipitated quasi-instantaneously and quantitatively from Na–Cl–Ba–CO2 solutions of seawater-like ionic strength (I=0.7mol/kg) at two pH values (∼7.9 and ∼10.6) at 25°C. The oxygen isotope composition of the witherite and the dissolved inorganic carbon speciation in the starting solution were used to estimate the oxygen isotope …