Influences of temperature and saturation states on the precipitation rate of calcium carbonates in seawater I. Mg-calcite
温度和过饱和度对海水中碳酸钙沉淀速率的影响I.镁方解石

Using the constant addition system, the precipitation of Mg-calcite in seawater was experimentally investigated at 5, 15, and 25 ℃. It was observed that, at each temperature, the relation between Mg-calcite precipitation rates and saturation states can be well expressed in the kinetic form of R=k(Ω-1)<'n> or Log(R)=nLog(Ω-1)+Log(k). The change of pCO2 would result in the remarkable variation of Mg-calcite precipitation rates, while it would not affect the kinetic expression of Mg-calcite precipitation. On the other hand, there are remarkable discrepancies among the kinetic expressions obtained at different temperatures, which indicate the thermodynamic relevance of the kinetic process of Mg-calcite precipitation.