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[en] The paper explores the limits to which a new graphical technique can distinguish the various hierarchical levels of sources of trace elements within biomonitors. When applied to data from Portuguese lichens, it appears to resolve four levels of sources, from plant material down to individual types of pollution. Careful factor analysis appears to offer very similar results, being weaker than the graphical method in some aspects and stronger in others. As a result, it now seems possible to determine sources for elements in lichens with better precision and confidence than was available previously. (author)
Source
International Atomic Energy Agency, Vienna (Austria); Instituto Tecnologico e Nuclear, Sacavem (Portugal); 250 p; ISSN 1011-4289; 
; Jun 2000; p. 47-62; International workshop on biomonitoring of atmospheric pollution (with emphasis on trace elements) - BioMAP; Lisbon (Portugal); 21-24 Sep 1997; 6 refs, 8 figs, 1 tab
; Jun 2000; p. 47-62; International workshop on biomonitoring of atmospheric pollution (with emphasis on trace elements) - BioMAP; Lisbon (Portugal); 21-24 Sep 1997; 6 refs, 8 figs, 1 tab