Atmospheric PCB Concentrations at Terra Nova Bay, Antarctica
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 sigmaPCB 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 sigmaPCB concentration obtained in this study were lower than those reported in previous Antarctic studies. Temporal concentration profiles of sigmaPCB do not correspond to seasonal temperature changes. In consideration of the low PCB concentrations observed, the studies with the wind roses, the regression between In 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.
Available from: Susanna Insogna
- "Over 90% of the total PCB content was due to congener with one to four chlorine atoms and only about 10% with five to seven chlorines, whereas higher chlorinated PCBs were below detection limits. In agreement with other studies, the results emphasized that the PCB profile was dominated by tri-CB and tetra-CB with relatively high contributions from mono- CB and di-CB (Gambaro et al., 2005). In addition, investigations on POP distribution in Antarctica were made by Ockenden at al. (2001b) which monitored the air for PCBs at two sites in the southern hemisphere, one over land and the other over water. "
Available from: Walter Patricio Mac Cormack
- "Among the persistent organic pollutants (POPs), PCBs are of special environmental concern in Antarctica. Although long-range atmospheric transport from production and application regions has been reported as the most relevant source of these ubiquitous anthropogenic organic pollutants in Antarctica (Weber and Goerke 2003; Gambaro et al. 2005), the local anthropogenic effect can be also a relevant source of PCBs at scientific stations (Negri et al. 2006). Because PCBs can strongly accumulate in the higher members of the Antarctic food chain (United Nations Environment Programme Chemicals 2002), which is simpler and more susceptible to external stresses than those existing in other more complex environments from warmer regions, the local production of these compounds, although occurring at low rates, is of important environmental concern. "
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ABSTRACT: Levels of butyltin compounds, polychlorinated biphenyls, and heavy metals were analyzed in marine sediments and organisms (Notothenia coriiceps, Laternula elliptica, and Nacella concinna), each of which has a different feeding strategy, in Potter Cove, Antarctica. PCBs were lower than detection limits in all samples. Only butyltin compounds were detected in a restricted area near the scientific station. Chromium, copper, magnesium, lead (Pb), and zinc had similar behavior in the cove, probably because they are regulated by similar process and conditions. However, Pb levels in some sites of the cove seem to be related to human activities in the area. Cadmium levels were relatively low, with the highest values found close to the shoreline, which is probably influenced by seasonal streams draining waters from Potter Peninsula. Results showed that despite the fact that Jubany Station has been operating for > 50 years, surface sediment and biota from Potter Cove do not exhibit levels of pollutants representing environmental concern.
Available from: Azizan Abu samah
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ABSTRACT: Atmospheric particulate matter and soil samples were collected around Scott Base, Antarctica and analyzed for solvent extractable organic compounds. Homologous compounds such as n- alkanes, n-alkanols and n-alkanoic acids were present in all samples and are indicative of contamination from anthropogenic activities and to a lesser extent from natural microbial input. Extractable PAH and oxy- PAH also confirm vehicular exhaust as a contributor to the organic particulate matter emitted into the atmosphere at Scott Base. Petroleum molecular markers such as pristane and phytane, as well as hopanes and steranes were also found in some soil and air samples. The concentrations of organic compounds were similar to those reported for rural locales in the northern hemisphere, suggesting that activities at Scott Base are contaminating the environment. ABSTRAK Sebatian-sebatian organik terekstrak dalam sampel jirim zarahan atmosfera dan tanah daripada Scott Base, Antarctica telah dianalisis. Hasil analisis mendapati bahawa sebatian-sebatian homolog seperti n-alkana, n-alkanol dan asid n-alkanoik wujud dalam semua sampel dan ini merupakan petunjuk bagi kontaminasi daripada aktiviti antropogenik dan sebahagian kecilnya daripada input mikrobial semulajadi. Kehadiran sebatian-sebatian HAP dan oksi-HAP juga mengesahkan eksos kenderaan sebagai penyumbang kepada jirim zarahan organik dalam atmosfera Scott Base. Petanda molekul petrolium seperti pristana dan fitana, dan hopana dan sterana juga ditemui dalam sesetengah sampel tanah dan udara. Kepekatan sebatian-sebatian yang diperolehi juga sama dengan nilai-nilai yang pernah dilaporkan bagi kawasan luar bandar di hemisfera utara. Ini menunjukkan bahawa aktiviti-aktiviti di Scott Base sebenarnya menyumbang terhadap kontaminasi di persekitarannya.
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