硅酸盐细菌在矿物表面上的吸附及其选择性——以正长石和黑云母为例

硅酸盐细菌在矿物表面上的吸附及其选择性——以正长石和黑云母为例

程良娟

南京农业大学资源与环境科学学院，南京 210095

收稿日期:2007-12-20 修回日期:2007-12-20 出版日期:2007-12-20 发布日期:2007-12-20

Adsorption of Silicate Bacteria on Surface of Orthoclase and Biotite and its Selectivity

CHENG Liang-juan

College of Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing 210095, China

Received:2007-12-20 Revised:2007-12-20 Online:2007-12-20 Published:2007-12-20

摘要/Abstract

摘要： 以硅酸盐细菌和正长石、黑云母为实验材料，研究了正长石和黑云母单独存在以及二者共存时，吸附时间和细菌浓度对硅酸盐细菌在其表面上吸附行为的影响。研究结果表明：1）硅酸盐细菌在正长石和黑云母上单位面积吸附量达到最大的时间分别为40 min 和30 min，对应的细菌浓度分别为25×106 个/mL 和30×106 个/mL；2）在细菌浓度相同时，无论是在正长石和黑云母单一矿物体系还是在二者共存体系中，正长石表面的单位面积吸附量始终大于黑云母；3）在正长石和黑云母共存体系中，硅酸盐细菌倾向于选择性吸附在正长石上，而且细菌浓度越大这种倾向越明显。实验结果有可能为研究矿物的微生物风化机理提供重要的信息。

Abstract: By using silicate bacteria, orthoclase and biotite, we studied the effects of adsorption time and silicate bacteria concentration on adsorption amount on mineral surface of orthoclase, biotite and their coexistence. The results show that the maxima of adsorption amount per unit area of silicate bacteria on orthoclase and biotite are 40 min and 30 min for bacteria concentration 25×106 /ml and 30×106 /ml, respectively. Both in the system of single mineral system and in the coexisting system, the adsorption amount per unit area of silicate bacteria on orthoclase is always higher than that on biotite. In the coexisting system, silicate bacteria prefer to be adsorbed on the surface of orthoclase. While concentration of silicate bacteria increases, the selective adsorption on orthoclase becomes more dominant. The results provide important evidence for the bioweathering mechanism of minerals.

程良娟. 硅酸盐细菌在矿物表面上的吸附及其选择性——以正长石和黑云母为例[J]. J4.

CHENG Liang-juan. Adsorption of Silicate Bacteria on Surface of Orthoclase and Biotite and its Selectivity[J]. J4.