Photometric complex-formation titrations of submicromole amounts of metals-III Back-titrations.
In this paper the theoretical considerations on photometric complex-formation titrations of submicromole amounts of metals in the presence of an approximately equivalent amount of indicator are completed by considering the back-titration of a metal in the presence of another metal which is displaced by the titrant. The simultaneous formation of different metal-indicator complexes M(p)I(q) is taken into account. Titration conditions have been derived, with which optimal experimental conditions can be selected. Optimum conditions for the analysis of an indium-ytterbium alloy are deduced from the theory.
Kragten
J
J
Natuurkundig Laboratorium, University of Amsterdam, Valckenierstraat 65, Amsterdam, The Netherlands.