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本文以实验模拟的方法,在不同酸度、溶解氧浓度等实验条件下,对玄武岩-水相互作用过程中样品表面和溶液中铁的浓度与价态变化进行了研究.结果发现:玄武岩-水相互作用时,样品表面的二价铁和三价铁从表面溶解下来进入溶液;在酸性较强的溶液中,溶解下来的三价铁被还原成二价铁并稳定地存在于溶液中,从而使溶液中二价铁离子的浓度增大,三价铁离子的浓度减小;在酸性较弱或偏碱性的溶液中,溶解下来的三价铁离子同OH-结合形成氢氧化铁沉淀,并吸附在样品的表面,使得反应后样品表面铁的含量有所增加;溶液中的溶解氧参与了铁的氧化-还原反应.据此,我们提出了玄武岩-水相互作用时铁的氧化-还原反应机理.
In this paper, under different experimental conditions, such as different acidity and dissolved oxygen concentration, the changes of concentration and valence of iron in the sample surface and solution during the interaction between basalt and water were studied. The results show that: basalt-water interaction The ferrous and ferric ions on the surface of the sample dissolve from the surface and enter the solution. In the more acidic solution, the dissolved ferric ions are reduced to ferrous iron and are stably present in the solution, so that the solution The concentration of ferrous ions increases and the concentration of ferric ions decreases. In the acidic or alkaline solution, the dissolved ferric ions combine with OH- to form ferric hydroxide precipitate and adsorb On the sample surface, the content of iron on the surface of the sample increased after the reaction, and the dissolved oxygen in the solution was involved in the oxidation-reduction reaction of iron.Accordingly, we proposed the oxidation-reduction mechanism of iron during basalt-water interaction .