I. Studies of the Distribution of Inorganic Substances Between Aqueous and Non-Aqueous Phases. II. Studies in Coulometric Analysis

Citation

Arcand, George Myron (1955) I. Studies of the Distribution of Inorganic Substances Between Aqueous and Non-Aqueous Phases. II. Studies in Coulometric Analysis. Dissertation (Ph.D.), California Institute of Technology. doi:10.7907/XM4H-9N36. https://resolver.caltech.edu/CaltechETD:etd-11212003-111738

Abstract

NOTE: Text or symbols not renderable in plain ASCII are indicated by [...]. Abstract is included in .pdf document. The distribution of arsenic (III) between aqueous HC1 solutions and [...] ether has been studied. Arsenic chloride species have been proposed, equilibrium constants have been calculated relating these species in the aqueous solutions, and distribution constants have been calculated for each species. The data from the distribution experiments have been correlated with solubility and electromotive force data taken from the literature. A partial study has been made of the distribution of ferric thiocyanate and of KSCN and NaSCN between aqueous solutions and tributyl phosphate. Sufficient data were taken to indicate that the distribution of the alkali thiocyanates is strongly dependent on the ionic strength of the aqueous solutions and that species of ferric thiocyanate other than (Fe(SCN)[subscript 3])[subscript x] are extracted by tributyl phosphate. A coulometric method for determining microgram quantities of bromate has been developed which made use of electrolytically generated cuprous copper as the intermediate. Optimum conditions for the titration were determined. Quantities of bromate ranging from 18 to 240 micrograms have been determined within 0.3 microgram. A coulometric method for the determination of ammonia has been developed which made use of electrolytically generated bromine in alkaline solutions as the intermediate. The effects of pH and of certain metal ions on the titration were studied. Quantities of ammonia ranging from 14 to 230 micrograms have been determined within 0.2 microgram.

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