Anorthite dissolution promoted by bacterial adhesion:Direct evidence from dialytic experiment  

作　　者：ZHOU YueFei WANG RuCheng LU XianCai 

机构地区：[1]State Key Laboratory for Mineral Deposits Research, School of Earth Sciences and Engineering, Nanjing University, Nanjing 210093, China [2]School of Resources and En virommentatl Engineering, Hefei Univetwity of Teehnology, Hefei 230009, China

出　　处：《Science China Earth Sciences》2011年第2期204-211,共8页中国科学（地球科学英文版）

基　　金：supported by National Basic Research Program of China (Grant No. 2007CB815603);National Natural Science Foundation of China (Grant No. 40802015);Ph. D. Programs Foundation of Ministry of Education of China (Grant Nos. 20050284043,20050284044)

摘　　要：Bacterial adhesion is crucial to the dissolution of minerals and rocks. By employing dialysis method, we designed comparative experiments to investigate the dissolution behavior of anorthite with the mediation of both adhered and non-adhered Paenibacillus polymyxa. The results show that during 10 experimental days, the dissolution of anorthite was promoted considerably by P. polymyxa and metabolites. Nanoscale precipitates were formed in contact experiment. Anorthite has a higher release of Ca and lower releases of Al and Si in dialysis experiment than in contact experiment. The difference implies that the release of Ca is controlled by mechanism of proton-exchange, whereas those of A1 and Si are controlled by ligand-complexation in which A1-O-Si bonds are destroyed first. Kinetically the release of Ca is controlled mainly by surface reaction and leached-layer diffusion. Both of them are restrained by adhered bacteria. The releases of AI and Si are controlled mainly by surface reaction, which is accelerated by adhered bacteria.Bacterial adhesion is crucial to the dissolution of minerals and rocks.By employing dialysis method,we designed comparative experiments to investigate the dissolution behavior of anorthite with the mediation of both adhered and non-adhered Paenibacillus polymyxa.The results show that during 10 experimental days,the dissolution of anorthite was promoted considerably by P.polymyxa and metabolites.Nanoscale precipitates were formed in contact experiment.Anorthite has a higher release of Ca and lower releases of Al and Si in dialysis experiment than in contact experiment.The difference implies that the release of Ca is controlled by mechanism of proton-exchange,whereas those of Al and Si are controlled by ligand-complexation in which Al-O-Si bonds are destroyed first.Kinetically the release of Ca is controlled mainly by surface reaction and leached-layer diffusion.Both of them are restrained by adhered bacteria.The releases of Al and Si are controlled mainly by surface reaction,which is accelerated by adhered bacteria.

关 键 词：ANORTHITE Paenibacillus polymyxa ADHESION DISSOLUTION DIALYSIS 

分 类 号：X831[环境科学与工程—环境工程] P618.130.2[天文地球—矿床学]