Mathematics – Logic
Scientific paper
Oct 1956
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1956gecoa..10..197h&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 10, Issue 4, pp.197-223
Mathematics
Logic
Scientific paper
The need for ready and rapid techniques for the analyses of a wide range of geological materials has inspired an investigation of the use of the Stallwood air-jet in d.c. arc-spectroehemical determinations of major, minor, and trace constituents. Techniques have been developed for the analysis of siliceous igneous and metamorphic rocks, carbonates, and ferric-oxide type of iron ores. Basic silicate rocks are still under investigation. The methods expand the use of strontium carbonate as first developed by Kvalheim, but for certain analyses barium carbonate is substituted. For some trace elements, Pd and In are also used as internal standards. Favourable features of the air-jet in eliminating matrix effects, and improving precision and linearity of curves, are illustrated. For many of the principal constituents of siliceous rocks an error of less than 5% is indicated by comparison of chemical and spectrochemical results on G-1 granite and W-1 diabase and five other rocks. Colorimetric methods for silica and flame photometer, for alkalies, provide useful checks. Spectro-graphic results on twelve trace elements in G-l granite and ten in W-l diabase compare well with determinations given by Ahrens. For the analysis of basic silicates and for determinations of MgO in carbonates, barium carbonate appears superior to strontium carbonate and is being further developed for the former, but strontium carbonate air-jet methods for analysis of impure carbonates ranging from limestones to dolomites are presented and their relative precision given. The latter methods are also applicable to ferric-oxide types of iron ores for eight trace elements.
Hawley J. E.
MacDonald Graham
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