Abstract

An emission spectrographic method for the simultaneous determination of trace quantities of copper, manganese, iron, and calcium in various types of dry natural rubber is described. The results are reproducible, the coefficient of variation averaging about 6% for samples of 1 g or larger. Accuracy of this method is verified by parallel analysis with atomic absorption spectrometry.

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)

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)

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)

The Quantitative Spectrochemical Determination of Barium, Strontium, and Calcium*

Werner Hartmann and Betty E. Prescott
J. Opt. Soc. Am. 38(6) 539-541 (1948)