Abstract
Mixtures of silver hydrosols and tributyl phosphate saturated diluted nitric acid exhibit an intense Stokes-Raman spectrum between 600 cm/sup -1/ and 1700 cm/sup -1/ which is possibly attributable to surface-enhanced Raman scattering but whose bands, however, cannot be assigned to tributyl phosphate. The observed effect which grows with increasing wavelength of the exciting light (Ar/sup +/ laser) depends on the acid concentration and attains a maximum for 1 M HNO/sub 3/, whereas in weakly acidic and neutral solutions it cannot be detected. Tributyl phosphate in diluted HClO/sub 4/ and H/sub 2/SO/sub 4/ gives the same spectrum. As the silver sol is rapidly destroyed by the acids the Raman bands can be observed for only about 1-3 h. No linear relationship between the Raman signal the tributyl phosphate concentration allowing quantitative work could be obtained which is possibly due to the strong instability of the hydrosol in the presence of acids. 13 references, 9 figures, 1 table.
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