微生物矿化成因的铁硫酸盐矿物表面特征初探

研究表明，生物一矿物相互作用是地球表层系统演化的重要地质营力之一。微生物与矿物岩石之间进行着活跃的物质交换，微生物通过营造微观地球化学环境和提供吸附、成核中心影响着矿物的溶解和结晶，其中生物一矿物界面是物质交换和化学反应最为活跃的场所，矿物表界面记录着丰富的微生物作用信息。在综述前人微生物一矿物相互作用界面研究的基础上，利用气体吸附技术，对比分析了微生物矿化成因和无机合成含水铁硫酸盐矿物的表面积、表面分形和表面吸附能特征，初步讨论了微生物矿化成因铁硫酸盐矿物的表面特征和控制机理。

Preliminary Study on Surface Properties of Iron Sulfate Formed by Microbially Induced Mineralization

It is well demonstrated that microbe-mineral interaction plays an important role as a geologic agent in the evolution of epigenetic system. There is a dynamic exchange of elements between microorganisms and minerals, which affects the surface structures of the minerals. The dissolution and crystallization of minerals are remarkably affected by metabolic activities of microorganisms through creating microenvironment at the interface or interaction with metabolic byproducts. As the biomineralization products, the newly-formed minerals generally record much information about the influence of microorganisms, which can be evaluated by surface characterization. This paper analyzes the specific area, pore structure, fractal dimension and surface energy of three types of iron sulfates formed by microbiological and abiotic chemical processes, respectively. The results show that schwertmanite and jarosite are formed in the 9K culture medium due to inoculation of Thiobacillus ferrooxidans; whereas, only jarosite was formed under the abiotic control. The particle structure, grain-size distribution and surface energy are quite different between the microbially and abitoically formed minerals.