INVESTIGADORES
ONDARZA Paola Mariana
congresos y reuniones científicas
Título:
Assessment of the spatial distribution of Organochlorine Pesticides and PCBs in the air of Patagonia Argentina by means of pine needles study.
Autor/es:
MIGLIORANZA K.S.B.; GONZALEZ M.; ONDARZA P.M.; MITTON F.; FILLMANN G.
Lugar:
New Orleans, Louisiana, USA
Reunión:
Congreso; 30th Annual Meeting of SETAC North America; 2009
Institución organizadora:
North America Society of Environmental Toxicology and Chemistry (SETAC)
Resumen:
Organochlorine pesticides (OCPs) and polychlorinated biphenyls (PCBs) are compounds of concern due to their distribution, global transport and toxicity.Pine needles can accumulate hydrophobic compounds from the ambient air, integrating contaminant loads over time, which are, hence, able to serve as biomonitors to evaluate the levels of organochlorinated contaminants in the atmospheric environment. To assess the spatial atmospheric concentration and variability of OCP and PCBs on a south of South America scale, pine needles were analyzed. The study was performed following a longitudinal and latitudinal network of 20 sampling stations. They were chosen close and far from sources regions in order to find field evidences of global contaminant fractionation. OCPs such as Hexachlorocyclohexanes (HCHs), alpha, beta- endosulfans and its metabolite sulfate, p,p´-DDT, p,p´-DDE, p,p´-DDD, chlordanes, heptachlor and drines; and PCBs congeners were determined by GC-ECD. Total OCPs and PCBs concentration ranged from 12 to 1133 ng/g lipid weight, with a high correlation with source regions. A clear differential distribution pattern was observed regarding to local source and samples far away form these areas. A predominance of Endosulfans (51-90%), which constitutes the unique organochlorine pesticide used under non-restrictions, followed by DDE and a relative low proportion of PCBs (congener #110, 118, 153, 138) was related with the vicinity to agricultural or industrial areas, respectively. The high relative proportion of DDE (80%) among DDTs in most of samples was in agree with previous results reported in soils, sediments, macrophytes and fish from the studied areas. However, when latitudinal samples were evaluated, reaching the most austral region of Patagonia Argentina, an increasing gradient (12-396 ng/ lipid weight) to the south with a predominance of DDTs (30%) and PCBs (35%) was observed inferring the long range transport of these compounds. Similar results were found in surface sediments from previous works. The use of pine needles as a tool for monitoring organochlorine compounds in air allows the recognition of emission and reception sites. Moreover the results of this work represent substantial information for the confirmation of distillation processes along South American scale.