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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
瞿成利¹, 刘刚², 路波²
1.中国科学院海洋研究所，中国科学院烟台海岸带可持续发展研究所，中国科学院研究生院;2.中国科学院海洋研究所，中国科学院研究生院

摘要:

采用稳定加液-反应系统对5、15和25°C下镁方解石沉淀在海水中的形成过程进行了研究。结果表明镁方解石的沉淀速率(R)对过饱和度(Ω)的响应均可通过R=k(Ω-1)ⁿ或Log(R)=nLog(Ω-1)+Log(k)形式的动力学方程加以表达。pCO₂的变化会显著改变过饱和度进而影响到镁方解石沉淀速率，但这一变化并不会对镁方解石沉淀形成过程的动力学表达产生影响。相比之下，不同温度下镁方解石沉淀形成的动力学方程存在明显差异，表明这一动力学过程同时还具有强烈的热力学相关性。

关键词: 海水镁方解石沉淀速率温度过饱和度

DOI：

分类号:

基金项目:国家自然科学基金项目(40776030)

Influences of temperature and saturation states on the precipitation rate of calcium carbonates in seawater I. Mg-calcite

QU Cheng-li,LIU Gang,LU Bo

Abstract:

Using the constant addition system, the precipitation of Mg-calcite in seawater was experimentally investigated at 5, 15, and 25°C. 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.

Key words: seawater Mg-calcite precipitation rate temperature saturation states

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