Physics
Scientific paper
Sep 1977
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977gecoa..41.1375t&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 41, Issue 9, pp.1375-1380
Physics
51
Scientific paper
Developments in the spark source mass spectrographic technique of trace element analysis have improved the precision of the method by about a factor of three. The main improvements have stemmed from corrections for interferences and corrections to the internal standard. The magnitude of interference corrections for the REE depends on the relative rather than the absolute abundances, being negligible for flat REE patterns and large for heavy REE depleted patterns. Precise determination of the photoplate intensity-density relationship is also considered to be important. Our data for BCR-1 fell within ± 3% of the "best estimate" of the "true" values. A set of relative sensitivity values for 31 elements show a factor of 25 between the most sensitive element (Rb) and the least sensitive (Ir). The relative element sensitivities depend on elemental boiling point, ionisation potential, and nuclide mass.
Gorton Michael P.
Taylor Stephen R.
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