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Determination of Ultra ‐ Trace Amounts of Thorium in NIM‐D and NIM‐P Standard Geological Reference Materials Using Cation Exchange Chromatography ‐ Spark Source Mass Spectrography
Author(s) -
VICTOR A.H.,
ROGERS D.E.C.
Publication year - 1983
Publication title -
geostandards newsletter
Language(s) - English
Resource type - Journals
eISSN - 1751-908X
pISSN - 0150-5505
DOI - 10.1111/j.1751-908x.1983.tb00394.x
Subject(s) - thorium , chemistry , uranium , dissolution , elution , trace amounts , mass spectrometry , ion exchange , ion exchange resin , chromatography , analytical chemistry (journal) , radiochemistry , materials science , ion , metallurgy , inorganic chemistry , medicine , alternative medicine , organic chemistry , pathology
Ultra‐trace (<1 ppm) amounts of thorium in NIM‐D and NIM‐P geochemical reference materials are determined by the technique of cation exchange chromatography ‐ spark source mass spectrography. After dissolution, thorium is selectively separated from all other elements on a column of AG50W‐X4 resin. The thorium eluate is concentrated and evaporated onto silver powder together with 1 000 ng of uranium which serves as the internal standard. Mass spectrographic analysis of this spiked silver powder is carried out with a spark source mass spectrograph.