Rapid dissolution of chromite with sulphuric acid-lithium sulphate mixture containing ceric sulphate, manganese dioxide or periodate, and spectrophotometric determination of chromium.
Cr(2)O(3) and chromite ore can be dissolved in H(2)SO(4)Li(2)SO(4)Ce(SO(4))(2) (20/10/1 v/w/w), H(2)SO(4)Li(2)SO(4)MnO(2) (20/10/1 v/w/w) and H(2)SO(4)Li(2)SO(4)KIO(4) (20/10/2 v/w/w) mixtures. The turbid solution produced can be clarified by treatment with H(2)O(2) or solvent extraction and the chromium determined spectrophotometrically at 614 nm.
Yoshikuni
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Laboratory for Analytical Chemistry, Faculty of Engineering, Chiba University, Yayoi-cho, Chiba, Japan.