The effect of aqueous sulphate on basaltic glass dissolution rates
The effect of aqueous sulphate on basaltic glass dissolution rates
复制标题
硫酸水溶液对玄武岩玻璃溶解速率的影响
作者：
T. Flaathen;E. Oelkers;S. Gíslason
摘要在50°C、pH值为3和4的混流式反应器中测定了玄武岩玻璃的稳态溶解速率与硫酸盐浓度的关系。发现在0.1摩尔/千克SO 42 −存在下的溶解速率比相应的无SO 42 −溶液中的溶解速率大1.3倍。发现该速率增加与使用Gislason和Oelkers（2003）先前提出的速率方程计算的速率增加大致一致。这些结果表明，添加硫酸盐注入CO2可以促进CO2封存在玄武岩中加速玄武岩玻璃溶解速率，从而更迅速地释放水溶液的Ca和Mg的溶液。
Abstract Steady-state dissolution rates of basaltic glass were measured in mixed-flow reactors at 50°C at pH 3 and 4 as a function of aqueous sulphate concentration. Dissolution rates in the presence of 0.1 moles/kg SO42− were found to be ∼3 times greater than those in corresponding SO42− free solutions. This rate increase is found to be approximately consistent with that calculated using a rate equation previously proposed by Gislason and Oelkers (2003). These results suggest that the addition of sulphate to injected CO2 may facilitate CO2sequestration in basalts by accelerating basaltic glass dissolution rates thus more rapidly releasing aqueous Ca and Mg to solution.