Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1246401 | Talanta | 2006 | 6 Pages |
Abstract
Three different ultrasonic-based sample treatment approaches, the automated ultrasonic slurry sampling, the ultrasonic assisted acid solid-liquid extraction (ASLE) and the enzymatic probe sonication (EPS) were compared and discussed for the determination of Cd and Pb by ET-AAS in biological reference materials. The sample mass chosen to perform the analysis was 10Â mg and the liquid volume was 1Â ml of nitric acid 1Â M. The best results were obtained with the slurry procedure with which it was possible accurate and precise determination of the Cd and Pb content in four of the five reference materials studied. Optimum performance (total metal extraction) of ASLE assisted by ultrasound for Cd was only achieved in two of the four materials assessed whereas total Pb recovery was only possible in three of the five samples. Total extraction with the enzymatic probe sonication was only obtained for Cd in oyster tissue. Neither ASLE nor EPS were able to extract Cd or Pb from spruce needles. Pb concentration obtained after EPS was found to be highly dependent from sample centrifugation speed and time.
Related Topics
Physical Sciences and Engineering
Chemistry
Analytical Chemistry
Authors
C. Maduro, G. Vale, S. Alves, M. Galesio, M.D.R. Gomes da Silva, C. Fernandez, S. Catarino, M.G. Rivas, A.M. Mota, J.L. Capelo,