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 pCO_2 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.
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