The determination of rubidium and strontium in silicates by flameless atomic-absorption spectroscopy

Amitai Katz

doi:10.1016/0009-2541(75)90087-X

The determination of rubidium and strontium in silicates by flameless atomic-absorption spectroscopy

Amitai Katz^*

^*Corresponding author for this work

Fredy & Nadine Herrmann Institute of Earth Sciences

Research output: Contribution to journal › Article › peer-review

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Abstract

A new method is described for the determination of Rb and Sr concentrations in silicate minerals and rocks by flameless (heated-graphite furnace) atomic-absorption spectrometry. Matrix effects, notably perchlorate interference with Rb, Ca with Sr and ionization of Rb⁰ to Rb⁺, are completely avoided by the addition of sulphuric acid to standards and unknowns of both Rb and Sr and by adding KCl to the Rb solutions before analysis. Absolute amounts down to 1 · 10^-10 g Sr and 5 · 10^-11 g Rb, can be measured with a reproducibility within ± 2% (for duplicates). The results obtained on standard silicate rocks are in good agreement with the values recommended by the U.S. Geological Survey (Flanagan, 1973). The method is suitable for Rb and Sr analysis of almost any silicate rock or mineral. It should find important application in RbSr geochronology, where it can be used both for total Rb determination and for calibration of the Sr separation columns.

Original language	English
Pages (from-to)	15-25
Number of pages	11
Journal	Chemical Geology
Volume	16
Issue number	1
DOIs	https://doi.org/10.1016/0009-2541(75)90087-X
State	Published - Aug 1975

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10.1016/0009-2541(75)90087-X

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abstract = "A new method is described for the determination of Rb and Sr concentrations in silicate minerals and rocks by flameless (heated-graphite furnace) atomic-absorption spectrometry. Matrix effects, notably perchlorate interference with Rb, Ca with Sr and ionization of Rb0 to Rb+, are completely avoided by the addition of sulphuric acid to standards and unknowns of both Rb and Sr and by adding KCl to the Rb solutions before analysis. Absolute amounts down to 1 · 10-10 g Sr and 5 · 10-11 g Rb, can be measured with a reproducibility within ± 2% (for duplicates). The results obtained on standard silicate rocks are in good agreement with the values recommended by the U.S. Geological Survey (Flanagan, 1973). The method is suitable for Rb and Sr analysis of almost any silicate rock or mineral. It should find important application in RbSr geochronology, where it can be used both for total Rb determination and for calibration of the Sr separation columns.",

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AB - A new method is described for the determination of Rb and Sr concentrations in silicate minerals and rocks by flameless (heated-graphite furnace) atomic-absorption spectrometry. Matrix effects, notably perchlorate interference with Rb, Ca with Sr and ionization of Rb0 to Rb+, are completely avoided by the addition of sulphuric acid to standards and unknowns of both Rb and Sr and by adding KCl to the Rb solutions before analysis. Absolute amounts down to 1 · 10-10 g Sr and 5 · 10-11 g Rb, can be measured with a reproducibility within ± 2% (for duplicates). The results obtained on standard silicate rocks are in good agreement with the values recommended by the U.S. Geological Survey (Flanagan, 1973). The method is suitable for Rb and Sr analysis of almost any silicate rock or mineral. It should find important application in RbSr geochronology, where it can be used both for total Rb determination and for calibration of the Sr separation columns.

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The determination of rubidium and strontium in silicates by flameless atomic-absorption spectroscopy

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