氯藻对金属的吸附。

Microbiologia (Madrid, Spain) Pub Date : 1997-12-01
J Garcia-Gil, C Borrego
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引用次数: 0

摘要

两种绿色光养硫细菌——极限氯藻(Chlorobium limicola)和phaeobacteroides——对几种金属离子(Mn2+、Fe2+、Ni2+、Cu2+、Zn2+、Cd2+和Pb2+)的吸收能力在实验室批量培养中进行了测试,培养浓度增加到2000 μ mol/l。除了镍——它不会被细菌细胞吸收——其余被测试的金属都是在一个快速和被动的过程中结合的,这个过程是用Freundlich等温线模型在数学上描述的。研究发现,两种物质的吸附能力取决于所涉及的金属,而在吸附强度上没有观察到差异,这表明在所有情况下,吸附过程都以类似的方式进行。此外,比较两种细菌对金属离子的吸附强度值和金属回收指数(Ri),发现双歧杆菌对金属离子的吸附效率高于双歧杆菌。讨论了这种能力在一些层状湖泊水柱中的生态意义,在这些水柱中经常发现亚铁和绿色光合硫细菌的最大值重合。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Sorption of metals by Chlorobium spp.

The capacity of two species of green phototrophic sulfur bacteria, Chlorobium limicola and C. phaeobacteroides, to sorb several metal ions (Mn2+, Fe2+, Ni2+, Cu2+, Zn2+, Cd2+ and Pb2+) has been tested in laboratory batch cultures at increasing concentrations up to 2,000 mumol/l. Except for nickel--which was not sorbed to bacterial cells--the rest of metals tested were bound in a fast and passive process, which was mathematically described by means of Freundlich isotherms models. The sorption capacity of the two species studied were found to be dependent on the metal involved, whereas no differences were observed in the sorption intensity, suggesting that in all cases the sorption process proceeds in a similar way. Further, the comparison of the sorption intensity values as well as the metal recovery index (Ri), for both species, revealed that C. phaeobacteroides was more efficient that C. limicola to attach metal ions. The ecological significance of this ability in the water column of some stratified lakes, where coinciding maxima of ferrous iron and green photosynthetic sulfur bacteria are frequently found, is discussed.

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