硫化物矿物溶解度与溶液pH值的关系

RELATIONSHIP BETWEEN SOLUBILITY OF SULFIDES AND SOLUTION pH VALUE

硫化物作为自然界常见的一大类矿物 ,由于溶解度很小 ,硫化物对水pH值的影响以及水对它的溶解度影响往往被人们所忽视。通过计算常见硫化物矿物的自由能ΔG0f、溶度积Ksp和溶解度S、绘制logS—pH曲线 ,得出硫化物矿物在不同 pH值条件下的溶解规律 ,水溶液的pH值受硫化物矿物的控制 ;反过来 ,水溶液的pH值也影响着矿物溶解度的大小。此外 ,对硫化物矿物饱和溶液的缓冲范围。

As a kind of common mineral, the affect of sulfide solubility on pH value of water solution each other is often neglected because their solution is very small. Therefor, on the basis of numeration of the free potential ΔG 0 f, the authors calculated the solubility product( K sp ) and the solubility( S ) of common sulfides, drew the curves of relationship between log S and pH value, and got some conclusion that the solution pH value was controlled by sulfides solubility, and vice versa, the pH value could affect sulfides solubility. Furthermore, the buffer capacity and range of sulfide saturation solution were calculated. And the reciprocity mechanism of sulfides and solution pH value was discussed.