微生物-矿物接触模式影响矿物溶解机制的实验研究——以多粘芽孢杆菌参与下的微纹长石溶解为例

微生物可通过直接和间接作用方式影响硅酸盐矿物的溶解。在细菌生长的不同阶段,这两种方式的贡献有所差异。利用微孔滤膜进行了一系列实验,研究了多粘芽孢杆菌对微纹长石溶解的影响。结果表明,在细菌生长的0~96h内,细菌及代谢产物能通过直接和间接作用共同促进微纹长石的溶解,但微纹长石中各元素的溶出在方式上有一定的差别,K和Si的溶出主要受间接作用的影响,而Al的溶出主要受直接作用的影响。在稳定期和衰亡期,细菌及代谢物均对K,Al,Si三种元素的溶出起较强的促进作用。在长石溶解的过程中,细菌的生长消耗、细菌表面络合作用、代谢物络合作用等均是影响离子浓度变化的重要因素,三种作用的协同效应,使得实验溶液中离子浓度随细菌生长表现出不规则变化的特点。

Influence of Microbe-Mineral Contact Model on Mineral Dissolution:A Primary Study on Microperthite Dissolution by Paenibacillus polymyxa

Microorganisms can promote the dissolution of silicates by direct and indirect mechanisms.The contribution of both mechanisms to the mineral dissolution varies with the growth stage of microorganisms.By employing microfiltration membrane,this research tried to illustrate the contributions of these two mechanisms to dissolution of microperthite.The results showed that during 96 hours , culturing,Paenibacillus polymyxa and its metabolites can promote dissolving microperthite both by direct and indirect mechanisms.The direct mechanism can promote releasing Al,but has little effect on K and Si,which are considered to be mainly released by indirect mechanism.Direct and indirect mechanisms both show intense effects in stationary and dead phases.During mineral dissolution,consumption of bacteria growth and complexation of bacteria and metabolites are also important factors influencing the concentration of elements.Furthermore,the synergetic effect complicates the ion concentrations.