硅酸盐细菌代谢产物影响斜长石风化作用的模拟试验  

WEARTHERING OF SILICATE MINERALS BY METABOLITES PRODUCED BY SILICCATE BACTERIA IN CULTURE EXPERIMENTS

作　　者：肖国光[1] 孙德四[1] 曹飞[1] 

机构地区：[1]九江学院化学与环境工程学院,江西九江332005

出　　处：《矿物岩石》2013年第1期8-15,共8页Mineralogy and Petrology

基　　金：国家自然科学基金项目(NO:51264014;51064011)

摘　　要：实验选用一株硅酸盐细菌,研究了实验条件下该菌株所产生的代谢产物对斜长石的分解与脱硅、铝的作用。通过检测不同风化培养基中代谢产物的种类与浓度、代谢产物与矿物相互作用过程中释放矿物中硅、铝的含量以及矿物晶体结构的变化,研究该菌株代谢产物对斜长石的风化过程和作用机制。结果表明:该菌株在不同的培养基中均会分泌氨基酸、有机酸与多糖等代谢产物,其中,在矿物风化培养基中菌株的代谢能力明显要高于无矿物培养基;各种代谢产物均对斜长石有一定的风化作用,多糖对矿物的分解作用最为明显,各代谢产物的混合物对斜长石的分解能力要高于各自代谢产物对矿物的分解能力。分析认为三种代谢产物的混合物在风化矿物的过程中具有一定的协同作用。A strain Of silicate bacteria was chosen to carry out a study on the microbial weathering of plagioclase by metabolites produced by the strain. The weathering progress and mechanism of microbial metabolite-mineral interaction was studied by measuring types and concentrations of microbial metabolites,analyzing densities of SiO2 and A12 03 and mineral crystal structures in the process of metabolite plagioclase interaction. The results show that the strain can secrete amino acids,organlc acids and polysaccharide in different media. In comparison with free mineral medium,the strain produced much more kinds and higher concentrations of metabolites in mineral weathering media. Each type of metabolites can decompose plagioclase. But polysaccharide is of higher effective on weathering plagioclase and releasing silicon and aluminum from plagioclase,as compared with the compounds of amino acids and the compounds of organic acids. The compounds of all kinds of metabolites have higher weathering ability than that of each metabolite. Weathering experiments show that the three kinds of metabolites have a certain synergistic effect on weathering plagioclase.

关 键 词：硅酸盐细菌 代谢产物 风化作用 

分 类 号：Q939.1[生物学—微生物学] TD952.5[矿业工程—选矿]