Determination of diaryl[dialkylcarbamoylmethyl]phosphine oxides solubility in nitric acid solutions

A method for ascertaining solubility of bidentate neutral organophosphoric compounds, diaryl[dialkylcarbamoylmethyl]phosphines in particular, in aqueous solutions of acids has been suggested. When developing the method, the phenomenon of essential increase in extraction of transplutonium, rare earth elements, iron, uranium, etc, with addition of small amounts of HClO4 was employed. The reagent concentration was determined indirectly according to the obtained distribution factor using a calibration curve lg Del=f([R]). 9 refs.; 1 fig