HYDROLYTIC AND RADIOLYTIC DEGRADATION OF OCTYL(PHENYL)-N,N-DIISO-BUTYLCARBAMOYLMETHYLPHOSPHINE OXIDE AND RELATED COMPOUNDS

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Abstract
The hydrolytic and radlolytic degradaton of octyl(phenyl)-N,N-dIIsobutylcarbamoylmethylphosphine oxide [0ϕD(lB)CMPO] has been investigated by measuring the distribution ratio of Am, D., between degraded organic solutions and aqueous solutions of selected HN03 concentrations and by measuring the concentration of OϕD(IB)CMPO In degraded solution using gas chromatographic analysis. Hydrolysis was performed by continuous stirring of decalin and CCH solutions of 0ϕD(lB)CMP0 with 5 M HNO3 at 50°C. Radiolysis was performed in a similar manner while irradiating the biphasic system with gamma rays from a 60Co source. From the experimental data, evidence was obtained for a degradation scheme of 0ϕD(iB)CMPO which Involves the formation of methyl(octyl)-(phenyl)-phosphine oxide (MOϕPO) and octyl(phenyl)phosphinic acid (H[0ϕP]). The proposed degradation scheme has been experimentally verified by measuring DAm from mixtures of MOϕPO and OϕD(iB)CMPO and of H[ϕP] and OϕD(iB)CMPO. Evidence was found that MOϕPO can replace 0(ϕD(iB)CMPO in the Am nitrato-CMPO complex, which prevents a rapid decline In DAm as the OϕD(IB)CMP0 is degraded.