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      Estudios de bioadsorción de plomo por Saccharomyces cereviceae en soluciones acuosas Translated title: Studies of lead biosorption by Saccharomyces cereviceae in aqueous solutions

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          Abstract

          El ecosistema del lago Titicaca (Puno, Perú) y sus tributarios, viene siendo perturbado por metales pesados producto de la actividad minera emergente. Para controlar y reducir la contaminación existen procesos biológicos llevados a cabo por microorganismos como las levaduras (biorremediación). Este trabajo de investigación tiene como objetivos evaluar la capacidad de bioadsorción de plomo mediante Saccharomyces cereviceae en soluciones acuosas y la influencia de dos niveles de pH durante la bioadsorción. Para esto se ensayaron dos concentraciones de S. cereviceae (cel/mL), las cuales fueron cuantificadas por un hemocitómetro y luego traspasadas a una solución con concentraciones conocidas de plomo (5 y 25 mg/L). Se realizaron lecturas de las concentraciones de plomo a los 5, 60 y 120 minutos. La mayor capacidad de bioadsorción resultó cuando S. cereviceae estaba a una concentración de 5 x 10(6) cel/mL, y el pH óptimo fue de 5,14. Se concluye que S. cereviceae constituye una buena alternativa para la bioadsorción de plomo, quedando abierta su validación en condiciones de campo en el altiplano peruano.

          Translated abstract

          Lake Titicaca's ecosystem and that of its tributaries in Puno (Peru) are being disturbed by heavy metals resulting from emergent mineral activity. Biological processes involving microorganisms such as yeasts (bioremediation) are being used for controlling and reducing such pollution. This research was aimed at evaluating Saccharomyces cereviceae's lead biosorption capacity in aqueous solutions and evaluating the influence of two pH levels on biosorption. Two S. cereviceae concentrations (cel/mL) were tested; these concentrations were quantified in a haemocytometer and then put into a solution having a known lead concentration (5 and 25 mg/L). Lead concentrations were read after 5, 60 and 120 minutes. The results revealed that the best biosorption level was obtained with a 5 x 10(6) cel/mL S. cereviceae concentration at 5.14 pH. S. cereviceae thus constitute a good alternative for lead biosorption; however, its validation in Peruvian altiplano field conditions remains to be tested.

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          Bioadsorción de metales pesados mediante el uso de biomasa microbiana

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            Ingeniería Ambiental. Fundamentos, entornos, tecnologías y sistemas de gestión

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              Sorption and desorption of cobalt by Oscillatoria anguistissima.

              Oscillatoria anguistissima rapidly adsorbs appreciable amounts of cobalt from the aqueous solutions within 15 min of initial contact with the metal solution. O. anguistissima showed a high sequestration of cobalt at low equilibrium concentrations, and it followed the Freundlich model of adsorption. The adsorption is a strongly pH-dependent and temperature-independent phenomenon. The presence of Mg2+ and Ca2+ (100-200 ppm) resulted in decline in Co2+ adsorption capacity of Oscillatoria biomass. Sulphate and nitrate (0. 75-10 mM) drastically reduced the extent of Co2+ biosorption. The biosorption of cobalt is an ion-exchange process as the Co2+ binding was accompanied by release of a large amounts of Mg2+ ions. Na2CO3 (1.0 mM) resulted in about 76% desorption of Co2+ from the loaded biomass.
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                Author and article information

                Journal
                biote
                Revista Colombiana de Biotecnología
                Rev. colomb. biotecnol
                Instituto de Biotecnología, Universidad Nacional de Colombia (Bogotá, Distrito Capital, Colombia )
                0123-3475
                January 2009
                : 11
                : 1
                : 33-39
                Affiliations
                [04] Puno orgnameUniversidad Nacional del Altiplano orgdiv1Facultad de Ciencias Biológicas Perú
                [03] Puno orgnameUniversidad Nacional del Altiplano orgdiv1Facultad de Ciencias Biológicas Perú
                [02] Puno orgnameUniversidad Nacional del Altiplano orgdiv1Facultad de Ciencias Biológicas Perú
                [01] Puno orgnameUniversidad Nacional del Altiplano orgdiv1Facultad de Ciencias Biológicas Perú
                Article
                S0123-34752009000100004 S0123-3475(09)01100104
                850229ec-2a11-49b5-9c23-518b8bf3f4ee

                This work is licensed under a Creative Commons Attribution 4.0 International License.

                History
                : 09 September 2008
                : 13 May 2009
                Page count
                Figures: 0, Tables: 0, Equations: 0, References: 11, Pages: 7
                Product

                SciELO Colombia

                Self URI: Texto completo solamente en formato PDF (ES)
                Categories
                Artículos/Investigación

                Biosorption,lead,yeast,bioadsorción,plomo,levadura
                Biosorption, lead, yeast, bioadsorción, plomo, levadura

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