Determination of lead, cadmium, indium, thallium and silver in ancient ices from Antarctica by isotope dilution-thermal ionization mass spectrometry

Geochemical Journal
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Abstract

The concentrations of five chalcophile elements (Pb, Cd, In, Tl and Ag) and the lead isotope ratios in ancient ices from the Taylor Dome near coastal Antarctica, have been determined by the isotope dilution-thermal ionization mass spectrometry (ID-TIMS), with ultra-clean laboratory techniques. The samples were selected from segments of cores, one of which included a visible ash layer. Electric conductivity measurement (ECM) or dielectric properties (DEP) gave distinctive sharp peaks for some of the samples chosen. Exterior portions of the sample segments were trimmed away by methods described here. Samples were evaporated to dryness and later separated into fractions for the five elements using an HBr-HNO3 anion exchange column method. The concentrations are in the range 2.62-36.7 pg Pb/g of ice, 0.413-2.83 pg Cd/g, 0.081-0.34 pg ln/g, 0.096-2.8 pg Tl/g and 0.15-0.84 pg Ag/g, respectively. The dispersions in duplicate analyses are about ±1% for lead and cadmium, ±2% for indium, ±4% for thallium and ±6% for silver, respectively. The concentrations of lead obtained are commonly higher than those in the present-day Antarctic surface snows, but the isotope ratios are distinctively higher than those of the present-day snows and close to those of the other ancient ice collected from a different Antarctic area.

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Publication type Article
Publication Subtype Journal Article
Title Determination of lead, cadmium, indium, thallium and silver in ancient ices from Antarctica by isotope dilution-thermal ionization mass spectrometry
Series title Geochemical Journal
DOI 10.2343/geochemj.31.175
Volume 31
Issue 3
Year Published 1997
Language English
Publisher Geochemical Society of Japan
Contributing office(s) Crustal Geophysics and Geochemistry Science Center
Description 7 p.
First page 175
Last page 181
Other Geospatial Antarctica, Taylor Dome site
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