A revised procedure for processing a capillary blood sample collected on filter paper (FP) for analysis by graphite furnace atomic absorption spectrometry (GFAAS) is described.
A 1/4-in. diameter disk of the dried FP sample was used, and a correlation of 0.975 with a false-positive rate of 0.8% and a false-negative rate of 1.7% was found when the results from the FP sample and its corresponding venous sample were compared.
Several analytical variables were investigated, and the following was found :
blood samples with hematocrit values of 30-39% did not show any significant differences between the paired FP and venous lead results ;
filter paper blank values were<2 mug/dL with the use of aqueous standards without correction and 0.1 mug/dL with a paper blank correction ;
and during the collection of 163 samples from 6 different urban sites over a period of 1 year, no environmental lead contamination was encountered based upon the good agreement between all of the paired FP and venous lead results.
The method described is easier to perform than an earlier version.
All indications suggest that a fingerstick capillary blood sample collected on filter paper is suitable for lead screening.
Proper precautions must always be taken to guard against contamination.
Mots-clés Pascal : Analyse chimique, Analyse quantitative, Plomb, Métal lourd, Polluant, Liquide biologique, Sang capillaire, Enfant, Homme, Préparation échantillon, Papier filtre, Spectrométrie absorption atomique, Four graphite, Surveillance biologique, Zone urbaine, Etats Unis, Amérique du Nord, Amérique
Mots-clés Pascal anglais : Chemical analysis, Quantitative analysis, Lead, Heavy metal, Pollutant, Biological fluid, Capillary blood, Child, Human, Sample preparation, Filter paper, Atomic absorption spectrometry, Graphite furnace, Biological monitoring, Urban area, United States, North America, America
Notice produite par :
Inist-CNRS - Institut de l'Information Scientifique et Technique
Cote : 97-0228557
Code Inist : 002B03L05. Création : 11/06/1997.