Influence of potassium dichromate on the reduction of sulfur, nitrate and nitrite ions by bacteria Desulfuromonas sp.

This article presents the regularities of reduction sulfur, nitrate and nitrite ions by sulfur reducing bacteria Desulfuromonas sp., which were isolated from water man-made Yavorivske Lake (Lviv Region, Ukraine), under influence potassium dichromate. in process anaerobic respiration can use reduce different electron acceptors, such as nitrates, nitrites, oxidized forms heavy metals, particular, hexavalent chromium. Technogenically altered ecotopes are characterized complex pollution, so several acceptors available to at same time. Strains microorganisms adapted unfavourable conditions therefore have high biotechnological potential. The purpose this work was investigate elemental or ion usage sulfidogenic genus simultaneous presence medium another acceptor – Cr(VI), establish succession strains these evaluate efficiency their possible application technologies purification environment metal compounds other inorganic toxicants. Bacteria grown Kravtsov-Sorokin without SO42– Mohr’s salt for 10 days. To study ions’ Cr(VI) sown media with NaNO3, NaNO2 K2Cr2O7 final S0, NO3–, NO2–or concentration 3.47 (concentration standard composition) 1.74, 3.47, 5.21, 6.94 10.41 mM. Biomass determined turbidimetric method, concentrations nitrate, nitrite, ammonium ions, hydrogen sulfide, Cr(ІІІ) cultural liquid spectrophotometrically. It has been established that inhibits biomass accumulation sulfide production sp. after addition into mM S0 1.74–10.41 Cr(VI). In initial content (3.47 mM) produced Cr(III) 3.3–3.4 times higher than sulfide. shown accumulation, NO3– reduced up 1.2 more those Cr(III). NO2– only slightly, 1.1 times, lower almost trivalent chromium detected liquid. processes nitride carried out revealed be less sensitive negative sodium dichromate, compared reduction, because 1.1–1.2 NH4+ Cr(III), but ) over three Our data allow us conclude genus, investigated (up toxicants, play an important role geochemical cycles nitrogen aquatic environments anthropogenic influence.