Authors: Paola S González Laura F Ambrosio Cintia E Paisio Melina A Talano María I Medina Elizabeth Agostini
Publish Date: 2014/07/16
Volume: 21, Issue: 23, Pages: 13551-13559
Abstract
A native bacterial strain with high capability for Cr VI removal was isolated from tannery sediments located in Elena Córdoba Province Argentina The strain was characterized by amplification of 16S rRNA gene and identified as Serratia sp C8 It was able to efficiently remove different Cr VI concentrations in a wide range of pHs and temperatures The addition of different carbon sources as well as initial inoculum concentration were analyzed demonstrating that Serratia sp C8 could reduce 80 of 20 mg/L Cr VI in a medium containing glucose 1 g/L at pH 6–7 and 28 °C as optimal conditions using 5 inoculum concentration The mechanisms involved in Cr VI removal were also evaluated The strain was capable of biosorpting around 75–85 of 20 mg/L Cr on its cell surface and to reduce Cr VI In addition approximately a 54 and 46 of total Cr was detected in the biomass and in the culture medium respectively and in the culture medium Cr III was the predominant species In conclusion Serratia sp C8 removed Cr VI and the mechanisms involved in decreasing order of contribution were as follows reduction catalyzed by intracellular enzymes accumulation into the cells and biosorption to the microbial biomass This strain could be a suitable microorganism for Cr VI bioremediation of tannery sediments and effluents or even for other environments contaminated with CrPSG MAT and EA are members of the research career from Consejo Nacional de Investigaciones Científicas y Técnicas CONICET Argentina LFA and CEP have a fellowship from CONICET We wish to thank PPI SECyTUNRC CONICET PICT FONCyT and MinCyT Córdoba for the financial support
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