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NOBLE METALS AND ALLOYS
ArticleName Determination of gold, silver and cobalt in sulfide ores and their processing products by atomic emission spectrometry with inductively coupled plasma
DOI 10.17580/tsm.2017.12.05
ArticleAuthor Evdokimova O. V., Pechishcheva N. V., Zaytseva P. V., Shunyaev K. Yu.
ArticleAuthorData

Institute of Metallurgy of Ural Branch of RAS, Ekaterinburg, Russia:
O. V. Evdokimova, Senior Researcher of Laboratory of Analytical Chemistry, e-mail: evdokimova_olga_@mal.ru
N. V. Pechishcheva, Senior Researcher of Laboratory of Analytical Chemistry
P. V. Zaytseva, Researcher of Laboratory of Analytical Chemistry

 

Ural Federal University named after the first President of Russia B. N. Yeltsin, Ekaterinburg, Russia:
K. Yu. Shunyaev, Senior Researcher of Laboratory of Electronic Microscopy

Abstract

We studied the influence of macrocomponents in sulfide ore materials on determination of valuable microcomponents (gold, silver and cobalt) by atomic emission spectroscopy with inductively coupled plasma. The degrees of matrix influence of copper, iron, nickel, and sulfur on spectral lines for analytes were calculated. The influence of sulfur on the analytical signal of gold, silver and cobalt was carried out theoretically using the equilibrium thermodynamic modeling. Compensation of matrix interferences was achieved by adding copper, nickel and iron into the calibration solutions. The optimal operational parameters were established: maximum values of emission signal for analytes were observed at a generation power of 1500 W, argon flow rates of 0.70 dm3/min, and a position of observation zone of 15 mm for axial plasma observation. A technique was developed for determining 0.0001–0.001% of gold, 0.001–0.01% of silver, and 0.02–0.6% of cobalt in sulphide ores, concentrates and their processing products, containing up to 40% of sulfur, copper, nickel and iron. The detection limits for gold and cobalt (0.08 g/t), and silver (0.1 g/t) were calculated using the Au I 267.595 nm, Ag I 328.068 nm, and Co II 238.892 nm spectral lines. The efficiency of the technique was proved using eight certified reference materials of copper, nickel, gold-silver ores, concentrates, and mattes; the results of target component determination agree satisfactory with certified contents.

keywords Atomic emission analysis, inductively coupled plasma, copper, nickel, gold-silver ores and concentrates, mattes, gold, silver, cobalt
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