基于钙添加的海水无机碳移除的增汇潜力研究

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摘要本研究在实验室内模拟不同初始条件,通过改变海水初始pH值、Mg/Ca比值、施加晶核等方式,定期监测海水pH值、DIC和TA的变化,探讨向海水中添加Ca²⁺移除溶解无机碳增加海洋碳汇的潜力.实验结果表明,向海水中引入Ca²⁺,可以有效降低当前自然海水的镁钙比值(5.2),并增加碳酸钙的过饱和度,从而促进海水体系中无机碳的移除.此外,含钙化合物的无机碳移除效果与海水初始pH值呈正相关,但单纯提升海水pH值并不足以诱导碳酸钙的生成,需通过额外引入Ca²⁺来提升碳酸钙过饱和度以实现显著无机碳移除效果.同时,实验还发现通过添加特定晶核诱导非均相沉淀,能够进一步促进海水中碳酸钙的生成,从而提高海水的无机碳移除效果,研究结果表明在施加45mmol/L的Ca²⁺和蒙脱土晶核、初始pH值达到8.5的条件下,碳酸钙生成量最高可达959μmol/L.海水无机碳移除后将在短期内吸收大气CO₂增加海洋碳汇,本文研究结果为探索海洋碳增汇技术提供了新的视角和理论基础.

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	李硕晨
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	王志博

关键词 ：海水无机碳, 碳酸钙沉淀, 海水碳移除, 海洋碳增汇

Abstract：This study explored the potential of introducing Ca²⁺ into seawater to remove dissolved inorganic carbon and enhance the oceanic carbon sink. Laboratory simulations under various initial conditions were conducted, by altering the initial pH of seawater, Mg/Ca ratio, and introducing seeding nuclei, monitor the changes in seawater pH, DIC, and TA regularly. Results indicated that the introduction of Ca²⁺ effectively reduced the magnesium-to-calcium ratio(5.2) in natural ocean and increased the oversaturation of calcium carbonate, thereby facilitating the removal of inorganic carbon from the marine system. Furthermore, the efficacy of inorganic carbon removal with calcium-containing compounds was positively correlated with the initial pH of seawater. However, solely elevating seawater pH was insufficient to induce calcium carbonate formation; additional Ca²⁺ introduction was necessary to enhance calcium carbonate oversaturation for significant inorganic carbon removal. Additionally, the study revealed that inducing non-homogeneous precipitation through the addition of specific nuclei further promotes calcium carbonate generation, thereby improving inorganic carbon removal from seawater.The research findings indicated that under the conditions of adding 45mmol/L of Ca²⁺ and montmorillonite nuclei, with an initial pH of 8.5, the maximum amount of calcium carbonate generated can reach 959 μmol/L. The removal of inorganic carbon from seawater, leading to the short-term absorption of atmospheric CO₂and increased oceanic carbon sink, offers a novel perspective and theoretical foundation for exploring ocean carbon enhancement technologies.

Key words： seawater inorganic carbon calcium carbonate precipitation seawater carbon removal ocean carbon sink

收稿日期: 2024-02-21

PACS:

X145

基金资助:崂山实验室问海计划项目(LSKJ202205000);崂山实验室“十四五”重大项目(2022QNLM040003-1);国家自然科学基金资助项目(42176200)

通讯作者: 李学刚,研究员,lixuegang@qdio.ac.cn E-mail: lixuegang@qdio.ac.cn

作者简介: 李硕晨(1998-),女,新疆石河子人,中国科学院海洋研究所硕士研究生,主要从事海洋化学碳汇研究.发表论文1篇.lishuochen21@mails.ucas.ac.cn.

引用本文:

李硕晨, 李学刚, 贺志鹏, 宋金明, 刘珊珊, 王志博. 基于钙添加的海水无机碳移除的增汇潜力研究[J]. 中国环境科学, 2024, 44(10): 5912-5920. LI Shuo-chen, LI Xue-gang, HE Zhi-peng, SONG Jin-ming, LIU Shan-shan, WANG Zhi-bo. Studies on the potential of inorganic carbon removal and carbon sequestration in seawater through Ca²⁺ addition. CHINA ENVIRONMENTAL SCIENCECE, 2024, 44(10): 5912-5920.

链接本文:

http://www.zghjkx.com.cn/CN/ 或 http://www.zghjkx.com.cn/CN/Y2024/V44/I10/5912

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