水资源与水工程学报2017，Vol.28Issue(4)：50-57,8.DOI:10.11705/j.issn.1672-643X.2017.04.09
海南岛滨海地区浅层地下水Ca2+的分布和阳离子交换分析
Distribution and cation exchange capacity of Ca2+ in shallow underground water in Hainan Island coastal area
摘要
Abstract
As an important geochemical element, cation Ca2+ has important significance in groundwater cycle and hydro-litho interaction especially in seashore zones.In order to understand Ca2+ behavior and variation in above zone, shallow groundwater sampling during tidal cycle and laboratory analysis was carried out around seashore of Hainan Island.The results show that the contents of calcium ion are different and fluctuates due to the influence of groundwater exchange and seawater intrusion, and the fluctuation of calcium ion occurs, which is non-conservative and active.The chemical species and minerals of calcium ion were drawn in the simulation, and results showed that CaSO4、CaHCO+3、CaCO3、CaOH+、CaHSO+4 most occurred free.Charged particle activity is most affected by free state, and calcium-containing minerals are mainly composed of sulfate and carbonate.Seawater intrusion also caused lower activity of free Ca2+ and more dynamic in resolution-precipitation equilibrium.According to free Ca2+ and other free cations resulted from PHREEQC modeling, their linear statistics also indicated that Ca-Na exchange was dominant and of anti-direction during sampling cycles.Generally, groundwater in northeastern parts of Hainan Island were of high relative cation exchange capacity (CEC) and southern and northwestern of high absolute CEC.It is concluded that the Ca2+''s behavior and thus their indication should be paid further attention in southeastern China land-sea transition immediate zone because of seawater intrusion.关键词
滨海地区/浅层地下水/钙离子分布/钙离子组分/阳离子交换Key words
shoreline zone/shallow groundwater/Ca2+ distribution/Ca2+ species/cation exchange分类
天文与地球科学引用本文复制引用
黄向青,甘华阳,何海军,张顺枝,潘毅..海南岛滨海地区浅层地下水Ca2+的分布和阳离子交换分析[J].水资源与水工程学报,2017,28(4):50-57,8.基金项目
中国地质调查局"我国重点海岸带滨海环境地质调查与评价"(1212010914020) （1212010914020）
