Airborne PCDD/F profiles in rural and urban areas of Buenos Aires Province, Argentina

• Published in: The Science of the total environment Vol. 573; pp. 1406 - 1412
• Main Authors: Cappelletti, N., Astoviza, M., Migoya, M.C., Colombo, J.C.
• Format: Journal Article
• Language: English
• Published: Netherlands Elsevier B.V 15-12-2016
• Subjects: Air Pollutants - analysis; Argentina; Buenos Aires; Dibenzofurans, Polychlorinated - analysis; Environment; Environmental Monitoring; Passive air samplers; Polychlorinated dibenzo-p-dioxin; Polychlorinated Dibenzodioxins - analysis; Polychlorinated-dibenzofuran; Argentina, Buenos Aires; Argentina, Buenos Aires Prov; Polychlorinated-dibenzofuran; Polychlorinated dibenzo-p-dioxin; Passive air samplers; Buenos Aires
• ISSN: 0048-9697; 1879-1026
• DOI: 10.1016/j.scitotenv.2016.07.126

Passive air samplers were deployed in 18 rural and urban locations in the densely populated Buenos Aires district to investigate airborne polychlorinated dibenzo-p-dioxin and polychlorinated-dibenzofuran (PCDD/Fs) profiles, sources and spatial patterns. Atmospheric concentrations reported as total toxic equivalents (TEQs), 2378-substituted (∑17PCDD/F) and 4–8 homologous groups (∑4–8PCDD/F) were highly variable and significantly correlated to urban scale. The rural average (3.0±2.7fgTEQm−3) was thirty times less than metropolitan values (90±51fgTEQm−3), with urban cluster (5.4±4.0fgTEQm−3) and urbanized area (33±50fgTEQm−3) in an intermediate position. A rural outlier exhibited the highest TEQ values (295–296fgTEQm−3) suggesting a local source. Principal component analyses (PCA) performed for ∑17PCDD/F and ∑4-8PCDD/F to identify source contributions showed more significant results for homologue groups compared to 17 congeners (83 and 45% of total variability explained, respectively) pointing to dominant diesel emissions enriched in TeCDF in rural areas, and open burning and industrial sources characterized by TeCDD, PeCDD contributing most in urbanized and metropolitan areas. Homologue group PCA also performed better clustering samples according to sources and TEQ concentrations. The PCDD/Fs profile of the rural outlier dominated by HxCDF and HpCDD/F showed a typical municipal incineration signature confirming the presence of local source.
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•Atmospheric PCDD/Fs concentrations were determined in atmosphere a range of urban agglomerations in Argentina•PCDD/Fs concentrations in rural and small towns are greater than an order of magnitude less than urbanized area•PCDD/F profiles are influenced by diesel, industrial, and open burning emissions