Phosphoryl-containing acidic podands as extractants for recovery of f-elements: 3. Dependence of the degree of association of podands on the nature of substituent and concentration in water–methanol solutions

Bidistilled water was used for the preparation of mixed solvents:methanol—water (7 : 1 vol/vol) and DCE saturated with water(0.20%). 1,2Dichloroethane saturated with water was obtainedby the extraction of equal volumes of water and DCE for 20 minfollowed by phase separation using centrifugation.The apparent molecular weight of particles (associates)