RAPISARDA Viviana Andrea
congresos y reuniones científicas
Analysis of parameters that affect the cupric ion bioaccumulation-biosorption by Escherichia coli
GRILLO-PUERTAS, M.; SCARAVAGLIO, O. R.; RAPISARDA, V. A.; RODRÍGUEZ-MONTELONGO, L.
Mar del Plata
Congreso; XLIII Reunión Anual de SAIB; 2007
Copper, one of the most toxic heavy metals responsible for contamination of rivers and deep waters, is attracting the attention from environmentalists, since mining activities increased. The potential of using microorganisms in the treatment of heavy metal-contaminated wastewaters has become important. The aim of the present work was to investigate the removal of Cu2+ ions from water via bioaccumulation using Escherichia coli AN387. Several parameters were studied (pH, temperature and competitive metal ions) on the Cu2+ bioaccumulation-biosorption. The assays were carried out in distilled water containing 109 cells with different copper salts concentrations (0 to 10 mM) and incubated for 30 min. pH effect: the removal of Cu2+ from aqueous solution was significantly reduced by the pH decreased. Temperature effect: no variation was observed in the accumulation of copper when the temperature was adjusted in the range from 27ºC to 42ºC. Competitive metals effect: different concentrations of Co2+, Cd2+, Mn2+, and Fe3+ were assayed within a Cu2+ concentration. Only when the level of these ions was similar to the Cu2+ concentration used, a decrease in the copper accumulation was observed. Further studies should be done in order to use the microorganism on wastewater treatments before rejecting liquid residues from pollution sources.