title: Colorimetric determination of traces of selenium, tellurium, manganese and cerium.
abstract: Methods are described for the colorimetric determination of micro- and semi-micro quantities of selenium, tellurium, cerium and manganese. The test solution in 0.35-3M condensed phosphoric acid medium is oxidized with an excess of permanganate. The colour intensity of the unreacted permanganate is measured at 530 nm.
authors.affiliation: Department of Chemistry, Andhra University, Waltair, India.
authors.forename: P P
authors.initials: PP
authors.lastname: Naidu
authors.forename: G G
authors.initials: GG
authors.lastname: Rao