کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
215358 | 1426235 | 2014 | 6 صفحه PDF | دانلود رایگان |
• Association between zinc (II) and dipicolylamine was studied by ITC.
• Increasing heat release was observed as the titration proceeded.
• Thermodynamics of the association was discussed.
• The increasing heat release was ascribed to solubility increase of colloidal Zn(OH)2.
In this study, association between zinc (II) and dipicolylamine was studied by isothermal titration calorimetry. At neutral of weakly alkaline conditions, with zinc (II) in cell and dipicolylamine in syringe, increasing heat release was observed as the titration proceeded. Considering the equilibrium between Zn2+ and Zn(OH)2 at these conditions, the increasing heat release is ascribed to the increasing solubilization of colloidal Zn(OH)2 followed by neutralization of OH- by the buffer. Though quantitative determination of the increase in solubility is not accomplished, to the best of our knowledge, this is the first report about solubility increase of colloidal zinc hydroxide using calorimetric method.
Journal: The Journal of Chemical Thermodynamics - Volume 78, November 2014, Pages 37–42