| Autor: |
LEPOSAVA PAVUN, DUSAN MALESEV, DRAGAN VESELINOVIC |
| Jazyk: |
angličtina |
| Rok vydání: |
2007 |
| Předmět: |
|
| Zdroj: |
Journal of the Serbian Chemical Society, Vol 72, Iss 8-9, Pp 799-807 (2007) |
| Druh dokumentu: |
article |
| ISSN: |
0352-5139 |
| Popis: |
Using spectrophotometric methods and pH-metric measurements, it was found that the uranyl ion and phenylephrine form a 1:2 complex in the pH region 2.50 – 4.25 with two absorption maxima at 314.2 nm and 340.6 nm. The thermodynamic stability constant at I = 0 and T = 298 K (room temperature) of the UO2(II)–phenylephrine complex, [UO2(C9H12O2N)2]2+, is log β20= 14.0 and ΔGÆ2 = –79.6 kJ mol-1. A linear dependence of the absorbance at 340.6 nm on the concentration of phenylephrine was obtained in the range from 0.0025 mol dm-3 to 0.0245 mol dm-3 using a solution of 0.025 mol dm-3 UO2(NO3)2 at pH = 3.90 and I = 0.075 mol dm-3. The measurement error was 2.1 %. |
| Databáze: |
Directory of Open Access Journals |
| Externí odkaz: |
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