Raman hydrofluoric acid

The sodium hydroxide is titrated with HCl. In a thermometric titration (92), the sibcate solution is treated first with hydrochloric acid to measure Na20 and then with hydrofluoric acid to determine precipitated Si02. Lower sibca concentrations are measured with the sibcomolybdate colorimetric method or instmmental techniques. X-ray fluorescence, atomic absorption and plasma emission spectroscopies, ion-selective electrodes, and ion chromatography are utilized to detect principal components as weU as trace cationic and anionic impurities. Eourier transform infrared, ft-nmr, laser Raman, and x-ray... 

Tsikaeva et al. [290,291] investigated the Raman and IR absorption spectra of hydrofluoric acid solutions containing a wide range of concentrations of niobium, but no other additional cations. 

Protactinium(V) is stable in aqueous hydrofluoric acid at quite high concentrations, but irreversible hydrolytic condensation occurs in other halogen acid solutions even at protactinium(V) concentrations of the order of 10 to 10 M. Consequently, only fluoroprotactinates(V) have been prepared in aqueous solution. Raman studies (97) have established... 

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