A Sprectrochemical Method for the Determination of Selenium Page: 5
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Recent investigations (Coleman, 1956) have shown that selenium
commonly substitutes for the sulfur in sulfides associated with the
sandstone-type uranium ore deposits. To aid in the study of these
selenium substitutions, a rapid spectrochemical method has been
developed and-is reported here. The spectrograph is an excellent tool
for the selenium analyses because of the possibility of determining
quantitatively or semiquantitatively on the same exposure, any of
68 elements that may be present in the sample.
Regular spectrographic procedures with the use of ordinary plates,
however, lack the sensitivity needed to determine selenium in low
percentages, the lower limit for detection being approximately 5 percent.
The low sensitivity of this element results partly from absorption of
the light energy by any quartz in the optical system, and partly by
absorption of the low,-wavelength light by oxygen in the air and the
gelatin in the photographic emulsion. Another difficulty to be overcome
is the effect of the high excitation potential of selenium, which is
usually above the ionization potential of the elements forming the matrix
of the sample (Harrison and others, 1948).
Feldman (1945) reported the spectrographic detection of selenium
at 0.01 percent in certain samples by enhancing the line 2413 A by the
addition of 10 percent of tellurium. In this procedure the selenium
is concentrated by sublimation in a hard glass tube. The sublimate
is collected in a molten pellet of tellurium and the pellet is analyzed
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Waring, Claude L.; Worthing, Helen & Hazel, Katherine V. A Sprectrochemical Method for the Determination of Selenium, report, June 1957; Washington D.C.. (https://digital.library.unt.edu/ark:/67531/metadc1050719/m1/6/: accessed May 20, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.