| Abstract: | A simultaneous calorimetric and potentiometric technique has been developed for measuring the thermodynamics of proton binding to mineral oxides in the presence of a supporting electrolyte. Modifications made to a commercial titration calorimeter to add a combination pH electrode and maintain an inert atmosphere in the calorimeter reaction vessel are described. A procedure to calibrate potentiometric measurements in heterogeneous systems to correct for the suspension effect on pH is given. The enthalpy change for proton dissociation from TiO2 in aqueous suspension as a function of pH is reported for 0.01, 0.1, and 0.5 M NaCl. The enthalpy change for proton dissociation is endothermic, ranging from 10.5 ?? 3.8 to 45.0 ?? 3.8 kJ mol-1 over the pH range from 4 to 10. ?? 1989. |
| Genre: | Article |
| ProdID: | 70015517 |
| Citation Author: | Mehr, S. R.; Eatough, D. J.; Hansen, L. D.; Lewis, E. A.; Davis, J. A. |
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| Citation End Page: | 143 |
| Citation Issue: | 1 |
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| Citation Language: | English |
| Citation Larger Work Title: | Thermochimica Acta |
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| Citation Number Of Pages: | 15 |
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| Citation Search Results Text: | Calorimetry of heterogeneous systems: H+ binding to TiO2 in NaCl; 1989; Article; Journal; Thermochimica Acta; Mehr, S. R.; Eatough, D. J.; Hansen, L. D.; Lewis, E. A.; Davis, J. A. |
| Citation Start Page: | 129 |
| Citation Volume: | 154 |
| Citation Year: | 1989 |
| Type: | citation/reference |
| Text: | Calorimetry of heterogeneous systems: H+ binding to TiO2 in NaCl; 1989; Article; Journal; Thermochimica Acta; Mehr, S. R.; Eatough, D. J.; Hansen, L. D.; Lewis, E. A.; Davis, J. A. |
| URL (THUMBNAIL): | http://pubs.er.usgs.gov/thumbnails/outside_thumb.jpg |
| Date Other: | Sun, 1 Jan 1989 00:00 -0600 |
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