Abstract

A quantitative spectrographic method has been developed for the determination of traces of iron in high-purity copper and silver. The use of copper chloride as a spectrographic carrier improves the sensitivity and enables the method to be used over a very wide range of concentrations. Samples containing from 0.004 to more than 150 μg of iron (0.07–2500 ppm) can be determined by the identical procedure. A series of 15 replicate copper samples containing 6.4 ppm iron yielded a coefficient of variation of 5.2%. The intensity of the iron spectrum is apparently independent of the copper or silver matrix, which greatly simplifies the preparation of calibration curves. Methods for the preparation of iron-free copper chloride and for purifying graphite electrodes are also outlined.

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

P. A. Leichtle
J. Opt. Soc. Am. 34(8) 454-463 (1944)

An Application of Spectrographic Methods to Chemical Concentrations of Trace Elements in Iron and Steel Analysis

R. A. Wolfe and R. G. Fowler
J. Opt. Soc. Am. 35(1) 86-91 (1945)

Direct Spectrographic Determination of Copper and Manganese in Dyestuffs*

G. L. Buc, G. L. Royer, and A. R. Norton
J. Opt. Soc. Am. 32(8) 454-456 (1942)

Spectrochemical Analysis of High Copper in Cast Iron and Steel

W. R. Kennedy
J. Opt. Soc. Am. 37(3) 154-158 (1947)

Spectrochemical Analysis by the Copper Spark Method*

Mark Fred, Norman H. Nachtrieb, and Frank S. Tomkins
J. Opt. Soc. Am. 37(4) 279-287 (1947)