Concentrations of gas-phase polychlorobiphenyls (PCBs) were studied over an austral summer at a site in Terra Nova Bay, Antarctica. Gas-phase concentrations of individual PCB congeners in the atmosphere of Terra Nova Bay ranged from below the detection limit to 0.25 pg m-3, with a mean concentration of ∑PCB of 1.06 pg m-3. The PCB profile was dominated by lower-chlorinated PCB congeners; in fact 78% of the total PCB content was due to congeners with 1-4 chlorine atoms and only about 10% with 5-7 chlorines, whereas higher-chlorinated PCB congeners were below detection limits. The mean ∑PCB concentration obtained in this study were lower than those reported in previous Antarctic studies. Temporal concen- tration profiles of ∑PCB do not correspond to seasonal temperature changes. In consideration of the low PCB concentrations observed, the studies with the wind roses, the regression between ln P(PCB) and T-1, and the distribution of congeners, we can hypothesize that PCB local source contributions are not very important, whereas long-distance transport is the prevalent factor bringing PCBs to Terra Nova Bay.

Atmospheric PCB concentrations at Terra Nova Bay, Antarctica / A.Gambaro; L.Manodori; R.Zangrando; A.Cincinelli; G.Capodaglio; P.Cescon. - In: ENVIRONMENTAL SCIENCE & TECHNOLOGY. - ISSN 0013-936X. - STAMPA. - 39:(2005), pp. 9406-9411. [10.1021/es0510921]

Atmospheric PCB concentrations at Terra Nova Bay, Antarctica

CINCINELLI, ALESSANDRA;
2005

Abstract

Concentrations of gas-phase polychlorobiphenyls (PCBs) were studied over an austral summer at a site in Terra Nova Bay, Antarctica. Gas-phase concentrations of individual PCB congeners in the atmosphere of Terra Nova Bay ranged from below the detection limit to 0.25 pg m-3, with a mean concentration of ∑PCB of 1.06 pg m-3. The PCB profile was dominated by lower-chlorinated PCB congeners; in fact 78% of the total PCB content was due to congeners with 1-4 chlorine atoms and only about 10% with 5-7 chlorines, whereas higher-chlorinated PCB congeners were below detection limits. The mean ∑PCB concentration obtained in this study were lower than those reported in previous Antarctic studies. Temporal concen- tration profiles of ∑PCB do not correspond to seasonal temperature changes. In consideration of the low PCB concentrations observed, the studies with the wind roses, the regression between ln P(PCB) and T-1, and the distribution of congeners, we can hypothesize that PCB local source contributions are not very important, whereas long-distance transport is the prevalent factor bringing PCBs to Terra Nova Bay.
39
9406
9411
A.Gambaro; L.Manodori; R.Zangrando; A.Cincinelli; G.Capodaglio; P.Cescon
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2158/204741
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