Analysis of arsenic biotransformation by indigenous bacteria isolated from industrially contaminated sites.
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Date
2024
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UMT, Lhr
Abstract
The presence of arsenic in industrial effluents, its mobility, and bioavailability in environments poses a perilous risk for ecosystem as well as human health. The present
work is concerned with the isolation and identification of arsenic resistant bacteria from industrially contaminated sites of Kasur, Pakistan, and evaluation of their ability for biotransformation of arsenic. Seven arsenic resistant bacterial strains (HIA1, HIA2, HIA4, HIA5, HIA6, HIA7 and HIA8) were isolated. HIA4 and HIA8 showed highest resistance against arsenate [As(V)] being 60 mM and 50 mM, and against arsenite [As(III)] being 20mM. In physiological optimization experiments the isolates were found to grow optimally at pH 7 and temperature 25°C and 37°C, respectively. HIA2 was found to be the most effective isolate in terms of oxidation of arsenite while HIA8 was most efficient in reducing arsenate. The isolates also showed resistance against mercury and chromium and against several antibiotics. The studies indicate the potential of bacterial isolates HIA4 and HIA8 in the bioremediation of arsenic-rich environments due to their strong biotransformation potential.