Metal contamination of soils at Scott Base,Antarctica |
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| Institution: | 1. Centro de Estudos do Mar da Universidade Federal do Paraná, P.O. Box 61, 83255-976 Pontal do Paraná, PR, Brazil;2. Programa de Pós-Graduação em Sistemas Costeiros e Oceânicos (PGSISCO) da Universidade Federal do Paraná, P.O. Box 61, 83255-976 Pontal do Paraná, PR, Brazil;3. Universidad de Buenos Aires, Facultad de Farmacia y Bioquímica, Junín 956, C1113AAD Buenos Aires, Argentina;4. Instituto Antártico Argentino, Dirección Nacional del Antártico, Balcarce 290, C1064AAF Buenos Aires, Argentina;1. University of Bielsko-Bia?a, ul. Willowa 2, 43-309 Bielsko-Bia?a, Poland;2. Faculty of Earth Sciences, University of Silesia, B?dzińska Street 60, 41-200 Sosnowiec, Poland;3. Institute of Biochemistry and Biophysics, Department of Antarctic Biology, Polish Academy of Sciences, ul. Pawińskiego 5a, 02-106 Warszawa, Poland |
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| Abstract: | Soil samples taken from excavated pits on traverses across New Zealand’s Scott Base, Antarctica, were leached with water and 0.01 M HNO3 and the leachates analysed for Ag, Al, As, Cd, Cr, Cu, Fe, Mn, Ni, Pb and Zn. The soils had high conductivity and pH values generally increasing with depth and in the range 8.3–10.1. The water leachate generally contained most of the extractable metals except Mn and Cd, and As. Linear relationships were observed between some metals leached into alkaline solution and the Fe in those solutions. The ratios to Fe were comparable to those of the host basanite, and this observation is interpreted as showing that these metals are incorporated in fine mineral particulates derived directly from the rock mass. Outliers in leachable metal concentrations in the soils indicated appreciable contamination of the soil from anthropogenic sources with Ag, Cd, Cu, Pb and Zn as well as As. In some locations high concentrations of Ag and Cd correspond to specific sources and drainage channels. High concentrations of Pb were widely spread and in the top soil layers whereas the elevated concentrations of Zn were distributed throughout the soil profiles indicating atmospheric sources and different mobilities within the soils. Transport within the soils is evident for some metals, as is lateral movement over and through the soils. |
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