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Biosorption of Cr(VI)_ and Cr(III)_Arthrobacter species | | E.Gelagutashvili
; E.Ginturi D.Pataraia
; M.Gurielidze
; | | Date: |
15 Jun 2011 | | Abstract: | The biosorption of Cr(VI)_ and Cr(III)_ Arthrobacter species (Arthrobacter
globiformis and Arthrobacter oxidas) was studied simultaneous application
dialysis and atomic absorption analysis. Also biosorption of Cr(VI) in the
presence of Zn(II) during growth of Arthrobacter species and Cr(III) in the
presence of Mn(II) were discussed. Comparative Cr(VI)_ and Cr(III)_
Arthrobacter species shown, that Cr(III) was more effectively adsorbed by both
bacterium than Cr(VI). The adsorption capacity is the same for both the
Chromium-Arthrobacter systems. The biosorption constants for Cr(III) is higher
than for Cr(VI) 5.7-5.9- fold for both species. Comparative Freundlich
biosorption characteristics Cr(VI) Arthrobacter species of living and dry cells
shown, that capacity(n) is in both cases the same(1.25,1.35). Dry cells have
larger biosorption constant for both species, than living cells. Biosorption
characteristics (K) and (n) for A. oxidas are without Mn(II) and in the
presence of Mn(II) 2.6 x 10-4 (K), 1.37 (n) and 2.4 x 10-4 (K), 1.41 (n)
respectively; for A. globiformis without Mn(II) and in the presence of Mn(II)
2.0 x 10-4 (K), 1.23 (n) and 1.9 x 10-4 (K), 1.47 (n) respectively. Thus,
Biosorption characteristics did not change in the presence of Mn(II) ions.. It
was shown, that bioavailability increases in the presence of Zn ions in both
cases. (for Cr(VI)-Arthrobacter globiformis and for Cr(VI)- Arthrobacter
oxidas). Biosorption characteristics (K) and (n) for A. oxides in the absence
and in the presence of Zn(II) are 4.6 x 10-4 (K), 1.25 (n) and 6.6 x 10-4, 1.08
(n) respectively, for A. globiformis without Zn(II) and in the presence of
Zn(II) 3.4 x 10-4 (K), 1.35 (n) and 8.1 x 10-4 (K), 1.19 (n) respectively; n
values did not change. But for Cr(VI)-Arthrobacter globiformis increase is more
significant. | | Source: | arXiv, 1106.2918 | | Services: | Forum | Review | PDF | Favorites | |
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