INVESTIGADORES
WUILLOUD Rodolfo German
artículos
Título:
On-line preconcentration and determination of cadmium in bee honey using knotted reactor coupled to flow injection-flame atomic absorption spectrometry
Autor/es:
ORSI, R. F.; WUILLOUD, RODOLFO G.; ALTAMIRANO, JORGELINA C.; OLSINA, ROBERTO A.; MARTINEZ, LUIS D.
Revista:
JOURNAL OF AOAC INTERNATIONAL
Editorial:
AOAC INTERNATIONAL
Referencias:
Año: 2002 vol. 85 p. 1410 - 1414
ISSN:
1060-3271
Resumen:
An on-line cadmium preconcentration and determination system implemented with flame atomic absorption spectrometry (FAAS) associated with flow injection was studied. Cadmium was retained as Cd-2-(5-bromo-2-pyridylazo)-5-diethylaminophenoI Cd-(5-Br-PADAP) complex, pH 9.3. The Cd complex was removed from the knotted reactor (KR) with ethanol. A total enhancement factor of 140 was obtained with respect to FAAS (40 for KR and 3.5 due to the use of ethanol) With preconcentration time of 120 s. The detection limit value for preconcentration of 1 g sample was 0.5 ng/g. The repeatability for 10 replicate determinations at 5.0 ng/g Cd level was 3.5% relative standard deviation, calculated from peak heights obtained. The calibration graph using the preconcentration system for Cd was linear with a correlation coefficient of 0.9990 at levels near the detection limits to at least 2006 ng/g. The method was successfully applied to, determination of total Cd in honey samples.