- 期刊
- OpenAccess
Variation of the Apparent Dissociation Constants of Carbonic Acid with Magnesium and Calcium Concentrations in Seawater
海水中碳酸之表觀解離常數隨鎂及鈣離子濃度之變化
並列摘要
The effects of calcium and magnesium ion concentrations in artificial seawater (ASW) on the equilibrium state of the system H2CO3--H2O have been tested. The measured first and second apparent dissociation constants of carbonic acid, K(superscript ′)1 and K(superscript ′)2, increase with an increase in the concentrations of calcium and magnesium in ASW. The total and free activity coefficients of HCO^3- and CO^23^- at the ionic strength of 0.718 and temperature of 25°C decrease as a function of Mg:Ca concentration ratios in ASW. The results also show that the calcium ion has a greater effect on the apparent dissociation constants of carbonic acid than magnesium, suggesting that the calcium ion associates more strongly with bcarbonate and carbonate than the magnesium ion does.
延伸閱讀
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