- 作者: K. C. Srivastava
- 作者服務機構: Department of Chemistry B.I.T.S., Pilani (Rajasthan) India
- 中文摘要: The complex formation of Ytterbium (III) with Bromopytogallol red has been studied spectrophotometrically in an attempt to establish composition, stability, thermodynamic paramethers and optimum conditions for determining small amounts of ytterbium. The violet complex of ytterbium has λmax at 620 nm against a reagent blank. The composition determined by different methods is 1:1 at pH 6.2±0.1. the mean value of log K, free energy (⊿G), the heat content (⊿H) and entropy (⊿S) changes, of the complex are found to be 6.0, —8.1 kcal/mole, —3.5 kcal/mole and 15.53 e.U. respectively at 30℃. The net molar absorptivity and Sandell’s sensitivity is 19850 and 0.0087 μg of ytterbium /cm2. the effect of diverse ions was examined with thirteen cations and ten anions in the determination of ytterbium.
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