Abstract

A series of tests have been made using two spectrographic electrode materials to evaluate differences in response to the dc arc over a wide variation in current (6 to 38 amp). Carbon anodes burn at a faster rate than graphite, but carbon is overloaded at a lower current density. At high currents both materials approach the same burning rate. The burning rates are dependent on the arc current, the cross sectional area, and the properties of the grade used. Any one of the three variables can be partially compensated for by an equivalent change in the other two. The effects of burning rates on analytical results are discussed.

Spectroscopic Estimation of dc Arc Electrode Vapor-Jet Velocities*

Stanley C. Baker
J. Opt. Soc. Am. 54(10) 1204-1210 (1964)

Anode Temperatures and Characteristics of the dc Arc in Noble Gases*†

Bert L. Vallee and Milton R. Baker
J. Opt. Soc. Am. 46(2) 77-82 (1956)

Effect of Alkali and Alkaline Earth Chlorides on the Anode Temperature of the dc Arc*

Bert L. Vallee and Ralph E. Thiers
J. Opt. Soc. Am. 46(2) 83-86 (1956)

Carbon Arc as a Radiation Standard

M. R. Null and W. W. Lozier
J. Opt. Soc. Am. 52(10) 1156-1162 (1962)

Air-Cooled Electrodes for the Spectrochemical Analysis of Powders*†‡

B. J. Stallwood
J. Opt. Soc. Am. 44(2) 171-176 (1954)