| 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。
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| 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) |
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| Influences of temperature and saturation states on the precipitation rate of calcium carbonates in seawater I. Mg-calcite |
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QU Cheng-li,LIU Gang,LU Bo
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| 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.
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| Key words: seawater Mg-calcite precipitation rate temperature saturation states |
