ISSN:
1588-2780
Source:
Springer Online Journal Archives 1860-2000
Topics:
Chemistry and Pharmacology
,
Energy, Environment Protection, Nuclear Power Engineering
Notes:
Abstract k 0-Standardized INAA was applied to the determination of heavy elements in two lichen varieties of the speciesParmelia: caperata andsulcata. The aim was to find out differentiations between the two varieties concerning the accumulation of elements from the air. The samples were collected at about 70 locations randomly chosen in the whole country (Portugal). It was found a similar local variation for both species, between 20–25%. From the comparison it was observed thatParmelia sulcata accumulates larger amounts of most of the elements determined thanParmelia caperata; only Ca is more accumulated by thecaperata and Hg are similarly absorbed by both varieties. Therefore, it was concluded thatParmelia sulcata should be preferred as bioaccumulator when both varieties are present. Some pollution sources were identified, but the sampling net was too short to obtain an exhaustive identification. The quality control was made using NIST and IAEA reference materials: an accuracy of ±10% was found. The precision has also been estimated: it is better than 11% except for Hg (15%), Sr (13%), Ti (19%) and Mg (32%).
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF02055343
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