首页 | 本学科首页   官方微博 | 高级检索  
   检索      


Biosorption of metal ions byAzotobacter vinelandii
Authors:D Cotoras  M Millar  P Viedma  J Pimentel  A Mestre
Institution:(1) Departamento de Bioquimica y Biologia Molecular, Facultad de Ciencias Quimicas y Farmacéuticas, Universidad de Chile, Casilla 233, Santiago 1, Chile
Abstract:Azotobacter vinelandii was better than eitherDerxia gummosa orRhizobium trifolii for sorption of UO 2 2+ . Its maximum binding capacity was 0.25 mmol UO 2 2+ /g dry biomass with an affinity constant of 333 l/mmol at pH 4.1 according to the Langmuir model. In a semisynthetic medium,A. vinelandii showed the highest sorption capacity in the early stationary phase. The binding of UO 2 2+ , Cu2+, Ca2+ and Zn2+ was affected by the pH of the solution. With HCl as eluent, virtually all the sorbed UO 2 2+ was released. The presence of Cu2+, Cd2+, Ca2+, and Zn2+ inhibited the UO 2 2+ biosorption whereas Mg2+ and K+ had no effect.
Keywords:Azotobacter vinelandii  biosorption  cadmium  copper  metals  polysaccharide  uptake  uranium  zinc
本文献已被 SpringerLink 等数据库收录!
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号