INVESTIGADORES
ONDARZA Paola Mariana
congresos y reuniones científicas
Título:
Occurrence of Persistent Organic Pollutants in Argentina, South America: use of passive atmospheric sampler (PAS) vs. pine needles.
Autor/es:
MIGLIORANZA K.S.B.; ONDARZA P.M.; GOMES COSTA P.; GONZALEZ M.; MITTON F.; GRONDONA S.; SILVA BARNI F.; WANIA F.; BARRA R.; FILLMANN G.
Lugar:
Barcelona
Reunión:
Congreso; Society of Environmental Toxicology and Chemistry Europe 25th Annual Meeting.; 2015
Institución organizadora:
Society of Environmental Toxicology and Chemistry Europe
Resumen:
Persistent organic pollutants (POPs), included in the Stockholm Convention, are chemicals of global concern due to their persistence, long-range transport and toxicity. Atmospheric transport is responsible for pollutant dispersal over long distances. As part of the Latin American Atmospheric Passive Sampling Network (LAPAN), a monitoring program involving the use of pine needles and passive air samplers (PAS) was conducted. PAS using XAD-2 resin as a sorbent were deployed for three consecutive one-year periods (2010-2013) at seven sites in agricultural, urban, industrial and natural areas throughout different regions of Argentina. The latitude of the sites ranged from Bahía Blanca (38°42′S-62°16′W) in Buenos Aires Province to Río Gallegos (51°38′S-69°14′W), the southernmost site of Argentina. The main objectives of the project were: 1- To gather new data on atmospheric pollution (at improved spatial and temporal resolution); 2- To assess the influence of local and global sources by deploying PAS in rural, industrial, urban and remote areas; 3- To compare the occurrence and distribution of POPs in PAS and pine needles. Organochlorine pesticides (OCPs), polychlorinated biphenyls (PCBs) and polybrominated diphenyl ethers (PBDEs) were determined by GC-ECD and GC-MS and concentrations expressed in units of pg/m3. At sites at lower latitudes, which are close to agricultural zones endosulfans (150 pg/m3) were the predominant POPs in air, with a relative abundance of a-/b-isomers similar to that of the technical mixture (7:3). DDTs levels were also higher at lower latitudes with a predominance of the parent DDT (100 pg/m3). On the other hand, PCBs concentrations, ranging from 3.7 to 46 pg/m3, increased with latitude with higher average values at Río Gallegos with a predominance of lower chlorinated congeners (#18, 44, 52, 118). The industrial area of Bahia Blanca appears to be a source of PBDEs (8.3 pg/m3), increasing in strength from 2010 to 2013. Our previous results for pine needles showed a similar pollutant distribution pattern as the PAS. However, metabolites (DDE, endosulfan sulfate, heptachlor epoxide) were more dominant in pine needles. Although both samplers were useful to assess the atmospheric pollution by POPs, an integrated study using PAS and biological samplers is suggested in order to understand the behavior of these compounds in the atmosphere.