Abstract

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.

A Method for Micro-Spectrography of Metals

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The Quantitative Spectrographic Analysis of the Rare Earth Elements*I. Determination of Samarium in NeodymiumII. Determination of Europium in Samarium

Velmer A. Fassel and Harley A. Wilhelm
J. Opt. Soc. Am. 38(6) 518-526 (1948)

Photoluminescence spectra of impact diamonds formed by solid-state graphite-to-diamond transition

A. P. Yelisseyev, A. Y. Khrenov, and V. P. Afanasiev
J. Opt. Soc. Am. B 33(3) B43-B48 (2016)

Spectrographic Determination of Trace Elements in 70/30 Brass and Admiralty Brass. Part I*

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An Easily Cleaned Measure for Powders Used in Spectrography*

Cyrus Feldman
J. Opt. Soc. Am. 34(5) 290-290 (1944)