HR: 1400h
AN: GS23A-03    [Abstracts]
TI: Potentially Toxic Element Uptake by Bacillus jeotgali Strain U3: A Natural Attenuation Mechanism in polluted sediments from Estero de Urías Coastal Lagoon (SE Gulf of California)?
AU: * Green-Ruiz, C R
EM: cgreen@ola.icmyl.unam.mx
AF: Unidad Académica Mazatlán, Instituto de Ciencias del Mar y Limnología, Universidad Autónoma de México, Joel Montes Camarena s/n, Col. Centro, Mazatlán, SIN 82000, Mexico
AU: Rodríguez-Tirado, V A
EM: vart@ola.icmyl.unam.mx
AF: Universidad Politécnica de Sinaloa, Ninos Héroes 1413, Col. Centro, Mazatlán, SIN 82000, Mexico
AU: Carrasco-Valenzuela, A C
EM: asiavalenzuela@hotmail.com
AF: Unidad Académica Mazatlán, Instituto de Ciencias del Mar y Limnología, Universidad Autónoma de México, Joel Montes Camarena s/n, Col. Centro, Mazatlán, SIN 82000, Mexico
AU: Gómez-Gil, B
EM: bruno@ciad.mx
AF: CIAD Mazatlán, Unit for Aquaculture, AP 711, Mazatlán, SIN 82000, Mexico
AB: In addition to an increased flux of potentially toxic elements (PTE's) into aquatic ecosystems, toxicity, bioavailability and persistency of these pollutants have led to critical localized pollution sites around the world, and the risk for the environment and the health of organism, including humans, has been increased. Clean-up technologies for the treatment of huge volumes of water, sediments and soils contaminated with these elements are needed. Use of bacteria as concentrators of PTE's can become a good tool for the remediation of man- impacted coastal ecosystems. A subtropical estuarine bacterium was isolate from surface sediments from Estero de Urías coastal lagoon, Mazatlán, Mexico, which is an aquatic ecosystem surrounded by several anthropogenic that release PTE's into the environment. This bacterial strain (U3) was ascertained (16s rRNA analysis) to belong to the Bacillus jeotgali specie. Batch experiments with different bacterial biomass and PTE (Cd, Cu, Hg, Pb and Zn) concentrations, pH and temperature were carried out in order to evaluate the biosorption capacity of Bacillus jeotgali strain U3. Except data from Zn experiments, all values were fitted to the adsorption Langmuir model. The maximum adsorption capacities (q_max) were 58 mg Cd g^-1, 27 mg Cu g^-1, 191 mg Hg g^-1 (viable biomass), 21 mg Hg g^-1 (non-viable biomass), 90 mg Pb g^-1. Adsorption of Zn was 350 mg g^-1, when equilibrium concentration in solution was 130 mg Zn l^-1. According our data, Bacillus jeotgali strain U3 is considered as a suitable adsorbent and the presence of this microorganism in Estero de Urías coastal lagoon can produce a natural attenuation of potentially toxic elements pollution.
DE: 0330 Geochemical cycles (1030)
DE: 0418 Bioremediation
DE: 0448 Geomicrobiology
DE: 1030 Geochemical cycles (0330)
SC: Geochemical Society [GS]
MN: 2007 Joint Assembly