title: Quantitative treatment of exchange equilibria involving complexans-IV Indirect photometric determination of a very small amount of calcium.
abstract: A method of indirect photometric determination of a very small amount of calcium is described. Optimum experimental conditions are deduced from theoretical considerations of the exchange equilibrium: M + NY + nA right harpoon over left harpoon MY + NA(n) Microgram quantities of calcium are successfully determined in the presence of magnesium and phosphates by means of either aqueous photometry or solvent extraction of NA(n).
authors.affiliation: Laboratory of Analytical Chemistry, Nagoya Institute of Technology, Showa-ku, Nagoya, Japan.
authors.forename: G
authors.initials: G
authors.lastname: Nakagawa
authors.forename: I
authors.initials: I
authors.lastname: Namiki
authors.forename: M
authors.initials: M
authors.lastname: Tanaka