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 -> sediment -> water

Citations 1

"Determination Of Rhenium And Platinum In Natural Waters And Sediments, And Iridium In Sediments By Flow Injection Isotope Dilution Inductively Coupled Plasma Mass Spectrometry"
Anal. Chem. 1993 Volume 65, Issue 10 Pages 1419-1425
Debra C. Colodner, Edward A. Boyle, and John M. Edmond

Abstract: Methods have been developed to measure Re, Ir, and Pt in natural waters and sediments by isotope dilution inductively coupled plasma mass spectrometry (ID-ICPMS). The techniques have been applied to determination of the three elements in sediments, Pt in seawater, and Re in seawater, sediment pore waters, and river waters. In each ease, a stable isotope-enriched spike is added to the sample before processing. Sediments are dissolved in all-Teflon digestion vessels using a modified standard kitchen microwave oven. Anion exchange of the chloro complexes of Ir and Pt and of the perrhenate ion (ReO4-) is used to pre-concentrate the elements and to separate them from concomitants which produce molecular ions in the argon plasma resulting in isobaric interferences. Samples are then introduced into the ICPMS in a small volume (300-600 mL) using flow injection. Overall recoveries were 90 10 for all three elements, although the effects of variable recovery efficiency were minimized by the isotope dilution The method has detection limits (3 times background) of approximately 5 pg of Re, 6 pg of Ir, and 14 pg of Pt. Copyright 1993, American Chemical Society. Isotope dilution ICP-MS was used to determine Re, Ir and Pt in water and sediments by adding a stable-isotope enriched spike. The isotopes were pre-concentrated and separated from species which produce molecular ions in the Ar plasma by anion exchange of the chloro complexes of Ir and Pt and of the ReO ion (details given). Biorad AG1-X8 (100-200 mesh) resin was used (chloride form). Flow injection was used to introduce samples (300-600 µL). Platinum and Ir were eluted with 12 M HNO3 at 90-100°C and Re was eluted with 8 M HNO3 at room temperature Recoveries were 90 ± 10% and detection limits were 5 pg for Re, 6 pg for Ir and 14 pg for Pt. Interference in the analysis of sediments from the oxides of the rare-earth elements and Hf was reduced to 5% by anion exchange. The RSD were 5% for Pt at the 1-10 ng/g level, 20% for Ir at the 0.01-0.1 ng/g level and 15% for Re at the 0.01-0.1 ng/g level in sediments. In seawater, the RSD were 15% for Pt at the 60 pg/kg level and 2% for Re at the 8 pg/kg level.
Rhenium Platinum Iridium Mass spectrometry Mass spectrometry Sample preparation Interferences Resin Biorad