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Ultrapurification of Graphite by Preburning for Use in Emission Spectrography and Solids Mass Spectrography

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Preburning graphite spectrographic electrodes in an arc to reduce the residual elemental impurity levels is a common and effective practice. In emission spectrography, it is generally considered desirable to preburn the electrodes for a time at least equivalent to the anticipated exposure time to eliminate the electrode blank. This is a routine practice in the authors' laboratory for trace analysis problems. It has been observed that impurity levels can be reduced to the nondetectable level (by emission spectrography) by preburning in a 35-A dc are under a rare gas atmosphere for 30–40 sec.

Document Type: Short Communication


Affiliations: Chemistry Department, Cornell University, Ithaca, New York 14850

Publication date: March 1, 1969

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