Abstract

Gallium is separated from its impurities by solvent extraction of the HGaCl₄ complex with isopropyl ether from 6-7 N HCl. Two extractions suffice to lower the Ga concentration to negligible amounts. The volume of the HCl phase after extraction is reduced and a measured portion dried on waxed graphite electrodes. The spectra are excited with a condensed spark and photographed. Maximum sensitivities reported are (parts impurity per million parts gallium). Al - .03, Ca - .03, Cr - .06, Cu - .015, Pb - .06, Mg - .015, Ni - .06, Zn - .12. The coefficient of variation of measurement varies from 3.6% for Cu to 14.8% for Pb.

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)

Spectrochemical Analysis of High Copper in Cast Iron and Steel

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

The Spectrochemical Analysis of Copper Base Alloys*

Edwin K. Jaycox
J. Opt. Soc. Am. 35(2) 175-179 (1945)

The Spectrochemical Analysis of Nickel Alloys*

Edwin K. Jaycox
J. Opt. Soc. Am. 37(3) 159-162 (1947)

An Analysis of the Factors in Spectrochemical Microanalysis*

J. K. Hurwitz
J. Opt. Soc. Am. 42(7) 484-489 (1952)