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
Website: @unf

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Classification: Geological -> mineral -> galena

Citations 1

"Lead Hydride Generation For Isotope Analysis By Inductively Coupled Plasma Mass Spectrometry"
J. Anal. At. Spectrom. 1988 Volume 3, Issue 6 Pages 821-827
Xiaoru Wang, Miklos Viczian, Alexandra Lasztity and Ramon M. Barnes

Abstract: The hydride generator, which included a Thompson U-shaped glass phase separator or a porous PTFE tube separator, was coupled to a Sciex Elan 250 ICP-MS instrument. Generation and transfer of hydrides were optimized by flow injection ICP-MS; the best signal-to-noise ratio (SNR) was obtained with 0.6% HCl, 5% of NaBH4 in 0.1% NaOH solution and 1% of H2O2 (used for oxidation of Pb before hydride generation), and the optimum Ar flow rate was 1.46 l min-1. For standard solution containing 10 µg L-1 of Pb, calibration graphs were obtained by the isotope-dilution technique for 204Pb, 206Pb, 207Pb and 208Pb; the detection limits for each isotope were between 0.04 and 0.06 µg l-1. The technique was applied in the determination of Pb in NBS SRM 1643 (trace elements in water); recovery was quantitative and the coefficient of variation was 1.2% (n = 3). Ion abundances were also determined in certified galena and Pb samples (prep. described). The PTFE phase separator gave greater SNR and less interference. Interference from Fe(III) and Cu(II) was serious, but could be overcome by addition of sulfosalicylic acid and NaCN to the NaBH4 solution. The hydride-generation technique had significantly greater sensitivity for Pb than that involving nebulization.
Lead-206 Lead-204 Lead-207 Lead-208 Spectrophotometry Mass spectrometry Interferences Phase separator Reference material Teflon membrane Volatile generation Volatile generation