Intracellular versus extracellular accumulation of Hexavalent chromium reduction products by Geobacter sulfurreducens PCA

Environmental Pollution
Yufeng GongXuefei Zhou

Abstract

Hexavalent chromium (Cr(VI)) reduction by Geobacter sulfurreducens PCA was evaluated in batch experiments, and the form and amounts of intracellular and extra-cellular Cr(VI) reduction products were determined over time. The first-order Cr(VI) reduction rate per unit mass of cells was consistent for different initial cell concentrations, and approximately equal to (2.065 ± 0.389) x 10-9 mL CFU-1 h-1. A portion of the reduced Cr(VI) products precipitated on Geobacter cell walls as Cr(III) and was bound via carboxylate functional groups, a portion accumulated inside Geobacter cells, and another portion existed as soluble Cr(III) or organo-Cr(III) released to solution. A mass balance analysis of total chromium in aqueous media, on cell walls, and inside cells was determined as a function of time, and with different initial cell concentrations. Mass balances were between 92% and 98%, and indicated Cr(VI) reduction products accumulate more on cell walls and inside cells with time and with increasing initial cell concentration, as opposed to particulates in aqueous solution. Reduced Cr(VI) products both in solution and on cell surfaces appear to form organo-Cr(III) complexes, and our results suggest that such complexes are more stabl...Continue Reading

Citations

Jan 25, 2020·International Journal of Environmental Research and Public Health·Valeria AnconaAnd Vito Felice Uricchio
Feb 8, 2020·International Journal of Phytoremediation·Suman NayakParesh Kale
Aug 1, 2020·International Journal of Environmental Research and Public Health·Marina TumoloVito Felice Uricchio
Mar 12, 2021·Journal of Environmental Management·Bhupendra PushkarNikita Nilkanth
Dec 28, 2019·Journal of Hazardous Materials·Jianping LuAlistair G L Borthwick
Feb 19, 2019·Environmental Science & Technology·Jiaxin ShiJianhua Guo
Feb 25, 2020·Ecotoxicology and Environmental Safety·Sangeetha Cj, Shashidhar T
Dec 24, 2021·The Science of the Total Environment·Ying MengSoe Myat Thandar

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