title: Ion-exchanger colorimetry-II microdetermination of chromium in natural waters.
abstract: Ion-exchanger colorimetry for chromium(VI) with 1,5-diphenylcarbohydrazide has been developed for the determination of chromium at mug/l. concentrations in natural water samples. About 90% of the chromium(VI) in a 1-litre sample solution is concentrated in 200-400 mesh Dowex 50W-X4 resin within half an hour. It is possible to obtain higher sensitivity by employing a larger amount of sample solution. Total chromium can be determined by oxidizing chromium(III) to chromium(VI) with ceric sulphate.
authors.affiliation: Department of Chemistry, Faculty of Science, Kyushu University 33, Hakozaki, Higashiku, Fukuoka, 812 Japan.
authors.forename: K
authors.initials: K
authors.lastname: Yoshimura
authors.forename: S
authors.initials: S
authors.lastname: Ohashi