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Energy dispersive x‐ray fluorescence analysis of thin and intermediate environmental samples
Author(s) -
Cesareo Roberto,
Castellano Alfredo,
Mendoza Cuevas Ariadna
Publication year - 1998
Publication title -
x‐ray spectrometry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.447
H-Index - 45
eISSN - 1097-4539
pISSN - 0049-8246
DOI - 10.1002/(sici)1097-4539(199807/08)27:4<257::aid-xrs295>3.0.co;2-1
Subject(s) - x ray fluorescence , pellets , anode , analytical chemistry (journal) , materials science , x ray , resolution (logic) , x ray tube , fluorescence , chemistry , physics , optics , electrode , environmental chemistry , composite material , artificial intelligence , computer science
Energy‐dispersive x‐ray fluorescence (EDXRF) was applied to the analysis of environmental samples, such as algae, microalgae and marine sediments, prepared as thin samples by mixing powder with two‐component epoxy resins, and as intermediate samples in the form of pellets. Further, sulphur, the concentration of which is used as an index of degradation, was analyzed in situ on a 16th century mural painting inside the church of S. Stefano Rotondo in Rome. Finally, lead was monitored in air samples from the city of Lecce and a map of the Pb distribution at various locations in the city was obtained. The equipment for EDXRF analysis is based on miniaturized x‐ray tubes (Oxford, 30 kV, 0.1 mA, Mo or Pd anodes; or Hamamatsu, 10 kV, 0.3 mA, Ca anode) and on thermoelectrically cooled Si–PIN detectors, having an energy resolution of 250 eV at 5.9 keV. Lead was excited with a Gilardoni x‐ray tube (Radiolight, 80 kV, 5 mA, W anode and Mo secondary target) and x‐rays were detected with an HpGe detector with an energy resolution of 160 eV at 5.9 keV. © 1998 John Wiley & Sons, Ltd.