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A Spectrophotometric Study of the Interaction of Uranyl Ions with Orthosilicic Acid and Polymeric Silicic Acids in Aqueous Solutions
| Content Provider | Semantic Scholar |
|---|---|
| Author | Yusov, Aleksander B. Fedoseev, A. M. |
| Copyright Year | 2005 |
| Abstract | The interaction of UO22+ ions with orthosilicic acid Si(OH)4 and polymeric silicic acids (PSAs) was studied spectrophotometrically. The equilibrium constant of the reaction UO22+ + Si(OH)4 = UO2OSi(OH)3+ + H+ in solutions with the ionic strength I = 0.1–0.2 is log K = −2.56±0.09 (log K0 = −2.29±0.09 recalculated to I = 0); the stability constant of the complex UO2OSi(OH)3+ (I = 0) is log β0 = 7.52±0.09. Formation of small oligomers (degree of polymerization n ≤ 4) has virtually no effect on the apparent constant K. When high polymers are formed (n > 100), the apparent equilibrium constant decreases by a factor of 2–3, and the “true” equilibrium constant recalculated to the actual concentration of silanol groups increases by a factor of 3–4. The absorption spectrum of the complex UO2OSi(OH)3+ was obtained by treatment of the experimental spectra; it has an absorption maximum in the visible range at 422.5 nm, ɛ422.5 = 35±2 l mol−1 cm− 1. At pH higher than 5–6, complexes of UO22+ with PSAs of the composition UO2(≡SiO)2(≡ SiOH)m − 2 are formed. The absorption spectrum of such a complex was obtained. |
| Starting Page | 345 |
| Ending Page | 351 |
| Page Count | 7 |
| File Format | PDF HTM / HTML |
| DOI | 10.1007/s11137-005-0099-1 |
| Volume Number | 47 |
| Alternate Webpage(s) | https://page-one.springer.com/pdf/preview/10.1007/s11137-005-0099-1 |
| Alternate Webpage(s) | https://doi.org/10.1007/s11137-005-0099-1 |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
