University of North Florida
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Stuart Chalk, Ph.D.
Department of Chemistry
University of North Florida
Phone: 1-904-620-1938
Fax: 1-904-620-3535
Email: schalk@unf.edu
Website: @unf

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IAEA W-4

Classification: Reference Material -> IAEA -> W-4 -> Fresh water

Citations 2

"Direct Trace Determination Of Lead In Estuarine Water Using In-situ Preconcentration Of Lead Hydride On Ir, Zr And W-coated Graphite Tubes"
Anal. Chim. Acta 1998 Volume 368, Issue 3 Pages 281-289
Pilar Bermejo-Barrera*, Jorge Moreda-Piñeiro, Antonio Moreda-Piñeiro and Adela Bermejo-Barrera

Abstract: Methods for the direct trace determination of lead in sea water involving hydride generation, trapping and the atomization of the hydride generated in a graphite furnace has been developed. Different permanent coated graphite tubes: iridium, tungstate and zirconium coated graphite tubes were investigated for the in situ pre-concentration of lead hydride. The results obtained were compared with the ones achieved by the conventional HG-AAS. Trapping on Ir-coated graphite tubes offers the best analytical performances, with detection limits of 60 ng 1-1. The accuracy was studied using IAEA/W-4 and SLRS-2 reference materials, and the method was applied to several sea water samples. The number of samples analyzed in an hour was 40. 41 References.
Lead Spectrophotometry Volatile generation Reference material

"Use Of Flow Injection Cold Vapor Generation And Preconcentration On Coated Graphite Tubes For The Determination Of Mercury In Polluted Sea Waters By Electrothermal Atomic Absorption Spectrometry"
J. Anal. At. Spectrom. 1997 Volume 12, Issue 3 Pages 317-321
Pilar Bermejo-Barrera, Jorge Moreda-Piñeiro, Antonio Moreda-Piñeiro and Adela Bermejo-Barrera

Abstract: Methods have been developed for the trace determination of total and inorganic mercury in natural waters by cold vapor generation-trapping and atomization in a graphite furnace by selective reduction with NaBH4 and SnCl2. Iridium, tungstate and zirconium coated graphite tubes were investigated for the pre-concentration of the mercury vapor, The carrier solution was 0.4 M of HCl, and 0.2% NaBH4 and 1.0% SnCl2 were used as reducing solutions for total and inorganic mercury, respectively, Using iridium coated graphite tubes characteristic masses of 300 and 240 pg for total and inorganic mercury, respectively, and detection limits of 90 and 60 ng L-1 for total and inorganic mercury were obtained for a 1500 µl sample volume. The precision was between 0.7 and 2.1%, Accuracy of method was confirmed by the analysis of IAEA/W-4 fresh water reference material. 34 References
Mercury Methylmercury ion Spectrophotometry Preconcentration Volatile generation Reference material Volatile generation