ENAA studies of chromium uptake by Arthrobacter oxydans

Biosorption of Heavy Metals – New Perspectives

“…bacteria. The reduced Cr m species were not accumulated by the bacteria [28,57]; • anionic and cationic adsorption, where hexavalent chromium is adsorbed in the surface as well as the reduced trivalent chromium species; • reduction and anionic adsorption, similar to the previous, without retention of the reduced trivalent species which remain in solution.…”

“…bacteria present different morphologies according to their growth stage. During cellular exponential growth stage the bacteria present a rod-like shape which changes to cocci in the stationary phase [28]. The Gram coloration also varies, although in the stationary phase cells are Gram-positive [29].…”

“…Arthrobacter sp. bacteria are also known for their high DNA C + G content, normally in excess of 70% [28].…”

“…bacteria in the biotreatment of Cr VI solutions has been reported by several authors. Tsibakhashvili et al have based their studies on the mechanism of Cr VI bioreduction with Arthrobacter oxydans [28,57,[63][64][65] on the detection of Cr v intermediaries by ESR spectroscopy. Isolation of Arthrobacter crystallopoietes from Cr VI contaminated sites was reported by Camargo et al, whom also used molecular biology to understand the biological processes that related to Cr VI reduction and bioaccumulation [66].…”

Tailored zeolites for the removal of metal oxyanions: Overcoming intrinsic limitations of zeolites

“…Chromium is an important industrial compound, mainly used in electric plating, refining, printing and dying industries [17,18]. It is one of the most common inorganic contaminants present in groundwater of hazardous waste sites, in the form of hexavalent chromium, one of the most toxic priority pollutants [18][19][20].…”