在25°C时,碳酸盐固体溶液[Ca1-xNix) CO3的溶解和可溶性
Chengyou Ma1, Xiaoke Nong2, Fan Xu2
1College of Earth Sciences, Guilin University of Technology, Guilin, 541006, Guangxi, China.
Geochemical transactions
|November 29, 2024
概括
这项研究研究了溶于水中的碳酸固体溶液. 优先溶于N2脱气水中,而溶于CO2和水中,影响的地球化学循环.
科学领域:
- 地质化学 地质化学
- 环境科学 环境科学
- 材料科学 材料科学 材料科学
背景情况:
- -碳酸盐固体溶液对于了解天然水中的金属行为具有重要意义.
- 以前的研究还没有完全阐明这些混合碳酸盐的溶解行为.
研究的目的:
- 为了研究合成碳酸和碳酸盐固体溶液的溶解行为.
- 为了确定这些固体溶液在不同的水性环境中的可溶性产物 (Ksp).
- 了解和在固体阶段和水溶液之间的分离.
主要方法:
- 合成-碳酸盐固体溶液 [{Ca1-xNix) CO3}.
- 合成固体在25°C的N2脱气水 (NDW) 和CO2和水 (CSW) 中的试验性溶解.
- 随着时间的推移,分析水溶液中稳定的Ca和Ni度.
- 确定离子活动产物 (IAP) 和与可溶性产物常数 (Ksp) 的比较.
- 利用利普曼图和古根海姆参数来解释固体溶液的行为.
主要成果:
- 溶解通过中间阶段进行,形成Ni载阿拉贡岩结构阶段.
- 稳定的Ca和Ni度在240-300天后得到,根据Ni含量 (XNi) 和水类型而有所不同.
- 在NDW和CSW中确定酸盐和合成碳酸盐的Log IAP值的平均值.
- 观察到不一致的溶解,Ni2+在高XNi固体中优先溶解在NDW中,Ca2+在CSW中.
- 在 (Ca1-xNix) CO3固体溶液系列中发现了混合性差距.
结论:
- 碳酸固体溶液的溶解不一致,并且取决于水环境.
- 在固体和水相之间Ca和Ni的分离是由溶解介质 (NDW与CSW) 控制的.
- 这些发现为自然系统中的地化学循环提供了关键的见解.
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