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on the bacterial chromium reduction by Pseudomonas mendocina DS0601-FX-P22 were investigated. Two different initial chromium concentrations (15 mg/L and 25 mg/L Cr(VI)) were studied. The Cr(VI) reduction ability of the bacterium increased in the presence of metal ions like Cu 2+ and Fe 2+ and was significantly inhibited in the presence of metal ions like Ba 2+ and Ni 2+ . Also, Cu 2+ was the most efficient metal ion at Cr(VI) reduction for both Cr(VI) concentration (15 and 25 mg/L) in P. mendocina DS0601-FX-P22 bacterium.