Abstract
A DC arc excitation was applied to the spectrographic determination of micro amounts of Ag and Pd in pure gold.
As standard samples were used intermediate products of gold refining, of which the contents of Ag and Pd were chemically determined. One hundred milligrams of sample in a few small pieces was used in excitation.
The spectrographic conditions were : Ebert 3.4 m spectrograph, excitation voltage DC 300 V, arc current 7 amp, slit width 30 μ, electrode distance 3 mm, preburn 10 sec, and exposure 20 sec.
Linear calibration lines were obtained over the range of 430 ppm Ag and 4100 ppm Pd. Variation coefficients for Ag and Pd are 14% and, 6%, respectively.
