title: Ion-exchanger colorimetry-VI Microdetermination of nickel in natural water.
abstract: Ion-exchanger colorimetry with 1-(2-pyridylazo)2-naphthol (PAN) has been developed for the determination of nickel at the mug/l. level in natural water. With 1 litre of sample the detection limits are 1.3 x 10(-9)Mi.e., 0.077 mug/l. for fresh water and 5.8 x 10(-9)Mi.e., 0.34 mug/l. for sea-water. The distribution ratio is 5 x 10(4). Copper and zinc, which form coloured species with PAN in the resin phase, can be completely eluted with a masking solution composed of EDTA and thioglycollic acid (pH 7.8). Cobalt can be determined simultaneously by measurement at 628 nm.
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: Y
authors.initials: Y
authors.lastname: Toshimitsu
authors.forename: S
authors.initials: S
authors.lastname: Ohashi