Artículos, Informes y presentaciones en Congresos

URI https://digital.cic.gba.gob.ar/handle/11746/8684

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  • Presentación y líneas de investigación institucionales
    ( 2018) Colombo, Juan Carlos
    El LAQAB es un grupo interdisciplinario dedicado al estudio de la distribución ambiental de marcadores y contaminantes persistentes con un enfoque sistémico y biogeoquímico que desarrolla su actividad cubriendo: • Investigación • Docencia • Servicios/Extensión El LAQAB fue creado a fines del año 1994 como espacio dentro de la Cátedra de Química Ambiental y Biogeoquímica de la Facultad de Ciencias Naturales y Museo, UNLP, con el objeto de impulsar actividades de docencia, investigación y servicios en la temática de la distribución ambiental de tóxicos persistentes. En los más de 20 años desde su creación, el Laboratorio ha experimentado un crecimiento exponencial tanto en términos de infraestructura y equipamiento basado en los servicios a terceros y subsidios recibidos, como en la producción científica en revistas de primer orden internacional que lo han posicionado como referente en la temática. (Párrafo extraído a modo de resumen)
  • Contaminantes orgánicos persistentes en leche materna de centros urbanos de la provincia de Buenos Aires
    ( 2012) Della Ceca, Lara ; Migoya, Carolina ; Capelletti, Natalia ; Gómez, Graciela ; Arozamena, Diego ; Sobral, Madelón ; Piñero, Julia H. ; Soimer, Marisa ; Bosco, Nerisa ; Pérez, Elvira ; Gluzman, Osvaldo ; Rosa, María A. ; López, Mariela ; Colombo, Juan Carlos
    Due to their chemical persistence and high lipophilicity, persistent organic pollutants (POPs) have a tendency to accumulate and biomagnify in the food chain. Because of its easy noninvasive collection and high-fat content, human milk is a good indicator POPs in human populations. The aim of our study was to evaluate human exposure to POPs (PCBs, DDTs and its metabolites, α, β y γ HCHs, CHLDs: heptachlor, heptachlor epoxide, trans- and cis-chlordanes and nonachlors) in 59 human milk samples collected during 2010-2011 in Punta Lara, Ensenada, Florencio Varela and Buenos Aires.
  • Contaminantes orgánicos persistentes (COPS) en leche materna de centros urbanos de la provincia de Buenos Aires
    ( 2012) Della Ceca,Lara ; Migoya, Carolina ; Capelletti, Natalia ; Gómez, Graciela ; Arozamena, Diego ; Sobral, Madelón ; Piñero, Julia H. ; Soimer, Marisa ; Bosco, Nerisa ; Pérez, Elvira ; Gluzman, Osvaldo ; Rosa, María A. ; López, Mariela ; Colombo, Juan Carlos
    Due to their chemical persistence and high lipophilicity, persistent organic pollutants (POPs) have a tendency to accumulate and biomagnify in the food chain. Because of its easy and noninvasive collection, and high fat content, human milk, is a good indicator of these residues in human populations. The aim of our study was to evaluate human exposure to POPs (PCBs, DDTs and its metabolites, α, β y γ HCHs, CHLDs:\nheptachlor, heptachlor epoxide, trans and cis chlordanes and nonachlors) in 59 human milk samples collected during 2010-2011 in Punta Lara, Ensenada, Florencio Varela and Capital Federal.\nHuman breast milk was collected with manual breast pumps, centrifuged to separate the cream that was freeze-dried and ultrasonically extracted with petroleum ether. The extracts, previously treated with sulfuric acid to eliminate lipids, were cleaned up by silica gel chromatography and analyzed by gas chromatography.
  • Concentración de pesticidas organoclorados en aire del sur de la cuenca del Plata: un año de muestreo
    ( 2012) Bilos, Claudio ; Cappelletti, Natalia ; Astoviza, Malena J. ; Colombo, Juan Carlos
    Polyurethane foam passive air samplers (n=20) were deployed across the Southern del Plata basin to assess concentrations and distributions of Organochlorine Pesticides (OCPs) for ≈ 3-4 months periods all over a year. Annual average concentration of OCPs ranged from 326 to 9000 pg/m3 with predominance of endosulfans (Endo). Annual averages of Endo (230-8936 pg/m3) are higher than reported values for other countries from this region (Brazil, Bolivia, Chile y Colombia: 114-898 pg/m3). Maximum values correspond to the warm period in areas of intense soybean culture: North of BsAs and South of E. Ríos and Santa Fe (3072-21521 pg/m3).\nConcentrations of DDTs (12-235 pg/m3) are an order of magnitude lower than the sites where it is used against malaria at present (India: 5356pg/m3; South of Mexico: 2360 pg/m3) but DDT/DDE ratio (1.1-6.8) >1 suggests a relatively fresh contribution, possibly due to the use of dicofol that presents this compound impurity.\nThe HCHs showed high concentrations in Zárate (801-8348 pg/m3) where they predominanted (66% of the total) with an α/γHCHs ratio ≈7, similar to the technical mixture suggesting a fresh contribution.\nIn the metropolitan area chlordanes prevailed (83-691 pg/m3) representing 5-45% of the total, especially in Buenos Aires City, where the cis/trans-chlordane relationship >> 1.6 indicates a fresh contribution It was concluded that the OCPs have different spatial distribution: higher concentrations in agriculrure areas; diversity in composition of pesticides and higher values of clordanes in urban areas. Concentrations and relationship values suggest non-legal inputs or long range transport.