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.
| Identifer | oai:union.ndltd.org:pacific.edu/oai:scholarlycommons.pacific.edu:uop_etds-3204 |
| Date | 01 January 1990 |
| Creators | Rivera-Duarte, Ignacio |
| Publisher | Scholarly Commons |
| Source Sets | University of the Pacific |
| Detected Language | English |
| Type | text |
| Format | application/pdf |
| Source | University of the Pacific Theses and Dissertations |
Page generated in 0.002 seconds