Analytical applications of the reaction of thorium with benzenephosphonic acid |
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| Authors: | Charles V Banks Rodney J Davis |
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| Institution: | Institute for Atomic Research, Department of Chemistry, Iowa State College, Ames, IowaU.S.A. |
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| Abstract: | Benzenephosphonic acid quantitatively precipitates thorium as Th(C6H5PO3)2·3H2O at pH values as low as 0.5. The compound may be dried at 140° to 180° C and weighed, as a gravimetric means of determining thorium. On ignition, Th (C2H5PO3)2 3 H2O undergoes decomposition at 240° to 300° C to form Th(C6H5PO3)2·2H2O, at 450° to 650° C to form Th(HPO4)2·2H2O and finally at 800° to 1000° C to form Th(HPO4)2. The latter compound is stable to 1200° C.Potentiometrically (pK1' = 0.91, pK2' = 6.41) and spectrophotometrically (pK1' = 0.96, pK2' = 6.51) determined pK' values are reported. Absorption spectra of C6H5PO3H2, C6H5PO3H- and C6H5PO3-2 are reported. The solubility of Th (C6H5PO3)2·3H2O was studied as a function of pH and the average value of the solubility product (Ksp = 4s3) was found to be 3.24·10-31. |
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| Keywords: | Present address: Oak Ridge National Laboratories Oak Ridge Tenn |
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