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: Environmental -> dust -> road

Citations 2

"Flow Injection Inductively Coupled Plasma Mass Spectrometry For The Determination Of Platinum In Airborne Particulate Matter"
J. Anal. At. Spectrom. 1990 Volume 5, Issue 1 Pages 75-80
Hitoshi Mukai, Yoshinari Ambe and Masatoshi Morita

Abstract: Standard solution of Pt in 0.6 M HCl and samples of particulate airborne matter (prep. described) were introduced into a flow injection system (described) incorporating a cation-exchange column (16 cm x 8 mm) of Dowex 50W-X8 (50 to 80 mesh) which was pre-washed with 3 M HCl and stabilized with 0.6 M HCl. This system was used online for trapping major matrix elements, which cause suppression of the Pt signal at m/e = 195, and Hf (which interferes spectrally) from 0.6 M HCl medium. The eluate from the column was introduced into the ICP-MS for the determination of Pt. The calibration graph was rectilinear up to 40 µg L-1 of Pt, and the coefficient of variation (n = 5) for 2 µg L-1 of Pt was ~5%. The detection limit was ~0.1 µg L-1 of Pt in solution or 5 ng g-1 in airborne particulate matter. The method was applied to the determination of Pt in samples such as vehicle exhaust particulates and roadside dust.
Platinum Mass spectrometry Ion exchange Column Dowex Interferences Calibration Detection limit

"Flow Injection Determination Of Lead By Hydride Generation And Conductometric Detection"
Fresenius J. Anal. Chem. 1996 Volume 355, Issue 2 Pages 141-143
P. C. Hauser and Zhi-Ping Zhang

Abstract: Plumbane produced from the lead analyte in a flow injection manifold by reaction with sodium borohydride is passed through a porous poly(tetrafluoroethylene) membrane in a gas diffusion cell. The hydride reacts with bromine in the acceptor stream resulting in ionization which is detected by conductivity measurement. Direct mixing of the carrier with a reagent stream yields a limit of detection of approximately 1 mg/L. An improved detection limit of about 200 µg/L can be achieved by the incorporation of an auxiliary stream containing persulfate as oxidizing agent. The application of the method to the determination of lead in road dust and soil samples is demonstrated. The flow injection method was based on the reaction of PbH4 with Br2 to yield bromide ions which were detected by conductivity measurement. A sample of 75 µL was injected into a 0.04 M HNO3 carrier stream which was merged with the reagent stream, 0.3% NaBH4 in 0.05% NaOH. After passing through a reaction coil (60 cm x 0.5 mm i.d.), the flow was propelled to the gas diffusion cell where the liberated PbH4 diffused through a PTFE membrane and was collected in a 0.6 mM Br2 acceptor stream. The acceptor stream was propelled to the conductivity detector where the ionization was detected. All flow-rates were 0.3 ml/min. The calibration graph for Pb was linear for 2-12 mg/l, the detection limit was 1 mg/l and RSD (n = 5) were 3%. The method was applied to the determination of Pb in urban road dust and soil following sample preparation by a standard acid digestion procedure. The results were in agreement with those obtained by AAS.
Lead Conductometry Sample preparation Spectrophotometry Gas diffusion Teflon membrane Method comparison