Determination of lead, cadmium, indium, thallium and silver in ancient ices from Antarctica by isotope dilution-thermal ionization mass spectrometry
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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.
Study Area
| 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 |
| Google Analytic Metrics | Metrics page |