Reduction of chromium (VI) compounds by sulfate-reducing bacteria

• Main Authors: T. B. Peretyatko, S. P. Gudz
• Format: Article
• Language: English
• Published: Львівський національний університет імені Івана Франка 2010-09-01
• Series: Біологічні студії
• Subjects: cr (vi); sulfate reduction; sulfate-reducing bacteria; hydrogen sulfide; sulfate; bioremediation
• Online Access: http://publications.lnu.edu.ua/journals/index.php/biology/article/view/424

Bacteria performing dissimilatory sulfate reduction were isolated from Yaziv sulfur deposit wells. 12 cultures were resistant to the presence of 1 mM Cr (VI) in the medium. Addition of 5 mM Cr (VI) lead to the near two-fold biomass and hydrogen sulfide content decrease. At the absence of sulfate in the medium bacteria use Cr (VI) as the final electron acceptor. At the presence of sulfate and Cr (VI) in the medium the content of the latter decreased due to its reduction by hydrogen sulfide. Cr (ІІI) at concentrations 1–5 mM doesn’t does not have considerable inhibitory effect on the sulfate-reducing activity. The ability of the isolated sulfate-reducing bacteria to detoxify Cr (VI) by its usage as the final electron acceptor and its reduction by hydrogen sulfide, produced by bacteria, make them perspective in the environment bioremediation from toxic Cr (VI) compounds.