摘要
海水中溶存CO_(2)含量在一定程度上影响全球气候的变化,影响海洋生物的生长,控制海底碳酸盐岩的形成,是海洋环境、海底矿产资源以及海洋生物调查与评价的重要指标之一,对于海底矿产的勘探开发、海洋环境监测、海水及海底沉积物碳循环乃至全球碳循环的研究具有重要的学术价值。检测水中游离CO_(2)通常采用滴定法或亨利法,滴定法适用于检测地下水中游离CO_(2)的含量,目标通常为单个样品;亨利法更适用于海水中游离CO_(2)含量的检测,尤其适用船载现场采自同一海域的批量同源海水样品,检测结果主要基于CO_(2)在水中的理论亨利常数,但由于不同海水的温度、盐度、成分不同,其CO_(2)的亨利常数并不相同,需要先行测定海水样品中CO_(2)的亨利常数。本文依据质量守恒定律和CO_(2)在海水中的溶解规律,设计了测定海水中CO_(2)亨利常数的差量平衡法,预先构建多个不同质量、体积的气液平衡体系,再根据平衡体系间CO_(2)物质的量的差值求算CO_(2)亨利常数。应用差量平衡法测定了24个南海神狐海域分层海水样品中CO_(2)的亨利常数值,并通过多体系转换重合实验验证了差量平衡法的科学性与可行性。
The concentration of dissolved carbon dioxide in seawater affects global climate change,the growth of marine organisms and controls the formation of submarine carbonates,and it is one of the most important indices in the marine environment and mineral resource survey.It has important academic value for the exploration of seabed minerals,monitoring of marine environment,the study of carbon cycle in seabed sediments and even the global car-bon cycle.Titration and Henrys are used to determine the concentration of dissolved carbon dioxide in seawater.Ti-tration is suitable for the content of free carbon dioxide in groundwater for a single sample.The Henrys is more suit-able for seawater,especially for a great deal of seawater samples collected from the same sea area on board ships,the results are mainly based on the theoretical Henry’s constant of carbon dioxide in seawater.In fact,the Henry’s law constants of carbon dioxide in different seawater are different.In order to achieve higher measurement accur-acy and precision,the Henry’s Law Constants of carbon dioxide in seawater have to be determined first.An experi-mental plan is designed and D-value of Multi Balance Systems is put forward in this article,which is used to de-termine the Henry’s law constants of carbon dioxide in seawater.D-value of Multi Balance Systems is based on the principle of mass conservation and the dissolution behavior of carbon dioxide in seawater.In D-value of Multi Bal-ance Systems,multiple gas-liquid balance systems with different masses and volumes are constructed in advance,then the Henry’s law constant of carbon dioxide is derived on the basis of the different mass of carbon dioxide between the balance systems.The Henry’s values of carbon dioxide in 24 stratified seawater samples from the South China Sea’s Shenhu Sea are determined by D-value of Multi Balance Systems.At last the scientificalness and feasibility of D-value of Multi Balance Systems are proved by multiple system conversion coincidence experi-ments.
作者
刘广虎
邓丽婷
商和辉
崔浩楠
关成尧
汲栩梦
刘晓燕
韩若冰
Liu Guanghu;Deng Liting;Shang Hehui;Cui Haonan;Guan Chengyao;Ji Xumeng;Liu Xiaoyan;Han Ruobing(China Institute of Disaster Prevention,Sanhe,Hebei 065201,China;Hebei Key Laboratory of Earthquake Dynamics,Sanhe,Hebei 065201,China;Core and Samples Center of Nature Resources of China Geological Survey,Sanhe,Hebei 065201,China;Guangzhou Marine Geological Survey,Guangzhou,Guangdong,511458;Guangzhou Huali College,Jiangmen,Guangdong 529152,China)
出处
《海洋学报》
北大核心
2025年第6期22-32,共11页
基金
国家重点研发计划项目(2016YFC0303902-04)。
关键词
海水
CO_(2)
亨利常数
差量平衡法
测定
验证
seawater
carbon dioxide
Henry’s constant
differential balance method
determination
verification
