ISSN:
1573-2932
Keywords:
bacteria
;
metals
;
accumulation
;
metal mobility
Source:
Springer Online Journal Archives 1860-2000
Topics:
Energy, Environment Protection, Nuclear Power Engineering
Notes:
Abstract Bacterial metal accumulation may influence the mobility and chemical form (speciation) ofmetals in the environment. The passive adsorption of six metals (Cs, Sr, Eu, Zn, Cd and Hg) by asoil bacterium, Pseudomonas putida, was studied in the present work, using a radiotracerbatch-distribution technique. To replicate natural conditions, the adsorption was considered as afunction of pH (4-10) and ionic strength (0.01 M and 0.1 M KCl) at a low metal concentration(10-8 M). P. putida exhibited a total metal accumulating capacity of 200-1000 meq kg-1 bacteria(dry weight) (measured in 0.01 M KCl at pH 6.4). This capacity is comparable to that of manyorganic soil components and it is above the capacity of most inorganic constituents. The followingaffinity order of adsorption was observed: Hg〉Eu〉Cd,Zn,Sr〉Cs. The results indicatethat the bacterial surface carries different sites that exhibit varying affinity and capacity for bindingmetal ions. It can be concluded that the overall adsorption of metals by P. putida is determined byseveral interacting processes related to the properties of both the metals and the bacterial surfaceand to the composition of the solution phase (pH as well as ionic strength).
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1023/A:1022173617013
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