Abstract
An infra-red study of the systems tri-n-butyl phosphate-HNO 3 and bis-(2-ethylhexyl)-phosphoric acid-HNO 3 has been made. It has been observed that the nitric acid extracting into these organophosphorus solvents is predominantly of a molecular nature, and that the bonding is primarily to the phosphoryl oxygen. In the TBP system, at low HNO 3 concentrations and high aqueous content, some contribution from ionized HNO 3 species is possible. The distribution coefficients of HNO 3 for these systems are also reported.
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