Abstract
The levels of Al, As, Cd, Co, Cr, Cu, Fe, Hg, Mn, Ni, Pb, S,Se and Zn in the terrestrial mosses Scleropodium purumand Hypnum cupressiforme, collected from 75 samplingsites in Galicia (NW Spain), were determined. Using thesedata, four statistical methods of estimating backgroundlevels were then compared: one based on the use ofmultifactorial analysis, another that uses modal analysis, athird based on analysis of cumulative frequency curves, andthe last, which involves identifying groups of data with acovariance close to 60%. The first method was discountedbecause of difficulties in interpretation of the resultingdata. Very different estimates of background levels ofelements were obtained depending on which of the remainingmethods was used, and modal analysis was finally chosen asthe most suitable. Background levels varied depending on themoss species used and the levels of Al, Cu, Fe, Hg, Mn, Ni,Pb and Se in the two species were significantly different(p < 0.001). It was found that the dominant lithology in thesampling area had no influence on the estimated background levels.
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Carballeira, A., Couto, J.A. & Fernández, J.A. Estimation of Background Levels of Various Elements in Terrestrial Mosses from Galicia (NW Spain). Water, Air, & Soil Pollution 133, 235–252 (2002). https://doi.org/10.1023/A:1012928518633
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DOI: https://doi.org/10.1023/A:1012928518633