Abstract
The aggregation behavior of didodecylnaphthalenesulfonic acid (HDDNS) in carbon tetrachloride at 25.0 °C has been investigated by interfacial tension measurements, FT1R spectrophotometry, Karl Fischer titrations, and computer-aided analysis of the extraction of Zn(11) ion from nitric acid solution. HDDNS forms hydrated aggregates at analytical HDDNS concentrations greater than 4.4 × 10-6 M up to at least 0.1 M. Slope analysis of the extraction of Zn(11) up to ca. 5% loading with 0.001-0.1 M HDDNS solutions indicates that the size of the aggregates lies in the range 5–8 and increases gradually with increasing HDDNS concentration. By use of the computer programs SXLSQ and SXLSQA the extraction of Zn(11) up to ca. 40% loading may be described to within twice the experimental precision by formation of the three species HnAn, ZnAnHn-2, and Zn2AnHn-4 (A = DDNS- anion) characterized by a common aggregation number n in the range 5–8. Under the conditions employed, organic-phase nonideality effects as estimated by the Hildebrand-Scott treatment applied in the program SXLSQA are much less useful in understanding the extraction behavior than mass-action and speciation effects.
| Original language | English |
|---|---|
| Pages (from-to) | 155-176 |
| Number of pages | 22 |
| Journal | Solvent Extraction and Ion Exchange |
| Volume | 9 |
| Issue number | 1 |
| DOIs | |
| State | Published - Feb 1 1991 |
Funding
'Ihe U. S. Government reuins a nmexclusive. mydty-free license to publish or repmducc the published form of Ibis cnntribulim. or allow &en to do so. for U. S. Government purposes. This research was supponed by the Division of Chemical Sciences. Oflice of Basic Energy Sciences. US. Department of Energy under contract DE-ACOS-840RZ1400 with Manin Marietta Energy Systems. Inc. This researc :h was funded by the Division c~ f Chemical Sciences, Office of Basic Energy Sciences. U.S. Department of Energy under contract DE-AC05-840R21400 with Martin Marietta Energy Systems. Inc. This work was also supported by appointments to the U.S.D.O.E. Postgraduate Research Training Program (GJL). the Oak Ridge Associated Universities Student Research Participation Program (PAJ). and the U.S.D.O.E. Oak Ridge Science and Engineering Research Semester Pmgram (NMW). The authors thank C. F. Baes, Jr. (ORNL) for assistance with the computer programs SXLSQ and SXLSQA and W. J. McDowell (ORNL) and P. K. Kilpatrick (North Carolina State University) for helpful discussions during the preparation of this manuscript.