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Immobilisation of manganese, cobalt and nickel by deep-sea-sediment microbial communities

DRS at CSIR-National Institute of Oceanography

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Title Immobilisation of manganese, cobalt and nickel by deep-sea-sediment microbial communities
 
Creator Sujith, P.P.
Das, A.
Mourya, B.S.
LokaBharathi, P.A.
 
Subject immobilisation
sediments
microbial communities
metal-oxidising
 
Description Box core samples BC26 and BC36 from geologically different settings were examined to test the hypothesis that autochthonous microbial communities from polymetallic-nodule-rich Central Indian Basin sediments actively participate in immobilising metal ions. The bottom water dissolved oxygen concentration was reported to be 4.2-4.3 mL·L sup (-1) in the northern siliceous ooze (BC26) and 4.1-4.2 mL·L sup (-1) in the southern pelagic red clay (BC36); the sedimentation rates for these regions were 0.834 and 0.041 cm·kyr sup (-1), respectively. An onboard experiment, conducted under oxic and sub-oxic conditions with 100 mu mol of Mn, Co and Ni, showed that microbial immobilisation under sub-oxic conditions was higher than in azide-treated controls in BC26 for Mn, Co and Ni at 30, 2 and 4 cm below sea floor (bsf), respectively, after 45 days. The trend in immobilisation was BC 26>BC 36, Co>Mn>Ni under oxic conditions and Mn>Co>Ni under sub-oxic conditions. The depth of maximum immobilisation for Co in BC26 under sub-oxic conditions coincided with the yield of cultured Co-tolerant bacteria and Ni only with organic carbon at 4 cm bsf. This study demonstrates that the organic carbon content and bioavailable metal concentrations in sediments regulate microbial participation in metal immobilisation
 
Date 2011-06-16T07:00:59Z
2011-06-16T07:00:59Z
2011
 
Type Journal Article
 
Identifier Chemistry and Ecology, vol.27(3); 2011; 189–206
http://drs.nio.org/drs/handle/2264/3866
 
Language en
 
Rights The final and definitive form of the preprint has been published in the "Chemistry and Ecology" © 2011 Taylor & Francis; "Chemistry and Ecology" is available online at http://dx.doi.org/10.1080/02757540.2011.565749
 
Publisher Taylor & Francis