title: Spectrophotometric determination of bismuth and EDTA by means of the reaction of bismuth with pyrocatechol violet in the presence of septonex.
abstract: The reaction of bismuth(III) with Pyrocatechol Violet in the presence of the cationic surfactant Septonex was studied and the optimal conditions for its analytical use were found (lambda = 612 nm, pH = 3.1, C(PV) = 4 x 10(-5)M, C(Sept), = 5 x 10(-4)M). The Lambert-Beer law is obeyed over the bismuth range 0.1-7.5 mug/ml. Decomposition of the Bi-PV-Septonex complex was utilized for indirect determination of ethylenediaminetetra-acetic acid at concentrations of 0.3-7.4 mug/ml.
authors.affiliation: Department of Analytical Chemistry, Charles University, Albertov 2030, 128 40 Prague 2, Czechoslovakia.
authors.forename: D
authors.initials: D
authors.lastname: Honová
authors.forename: I
authors.initials: I
authors.lastname: Nemcové
authors.forename: V
authors.initials: V
authors.lastname: Suk