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Date of Award
Thesis - Pacific Access Restricted
Master of Science (M.S.)
First Committee Member
Patrick R. Jones
Second Committee Member
Ravindra C. Vasavada
Third Committee Member
Larry O. Spreer
The direct determination by Differential Pulse Anodic Stripping Voltammetry (DPASV) on a Mercury Thin Film Electrode of thallous ions in solution, in a slurry of 0.010 M aqueous NaF and gamma-A1203 , is reported at 25•C. An adsorption capacity of 72.8 Mg of Tl (I) per gram of gamma-A1203 was determined by continuous addition experiments with sixty minutes equilibration time.
However, continuous addition experiments using 0.010 M aqueous NaC104 , as background electrolyte, showed no adsorption of Tl (I) onto gamma-A1203 . This is attributed to the affinity of Tl (I) for perchlorate over hydroxyl anions.
The results obtained for the concentration of Tl (I) in solution in batches of 0. 010 M aqueous NaF with gamma-A1203 , in the range of pH from 7.5 to 10.5, determined by DPASV and Graphite Furnace Atomic Absorption Spectroscopy, agree with a 95% confidence level, given by the regression line analysis.
A strong dependence on pH is observed for the adsorption of Tl (I) onto gamma-A1203 , in 0.010 M aqueous NaF. A change from low adsorption values at pH 8, to high adsorption at pH 10 was observed.
Rivera-Duarte, Ignacio. (1990). A comparative study of the adsorption of T1+ onto gamma-A1203 in aqueous solution by DPASV and GFAAS. University of the Pacific, Thesis - Pacific Access Restricted. https://scholarlycommons.pacific.edu/uop_etds/2205
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