Determination of sulfur in metal sulfides by bromine water-CCl4 oxidative dissolution and modified EDTA titration |
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Authors: | Tsembel Darjaa Kohta Yamada Nobuaki Sato T Fujino Yoshio Waseda |
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Institution: | (1) Institute for Advanced Materials Processing, Tohoku University, Katahira 2-1-1, Aoba-ku, Sendai 980-8577, Japan, JP |
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Abstract: | The sulfur content in metal sulfides can be determined after oxidative dissolution with bromine water-CCl4 at 50 °C by modified EDTA titration. The sulfides were quantitatively oxidized to SO4
2– without evolving H2S, and the metal cations were removed by cation exchange on an H-type column. Sulfate was precipitated as BaSO4, and the remaining Ba2+ was subsequently titrated with EDTA at pH = 10. The standard deviation for the determined sulfur in the metal sulfides, some
of which can be hardly dissolved in usual mineral acid media, is about a few %. The method can be carried out with sample
amounts containing as little as 1.5–2 mg sulfur.
Received: 31 July 1997 / Revised: 5 January 1998 / Accepted: 9 January 1998 |
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