Study of stability of impregnated liquid extraction membranes with nuclear filters

Possibility of increasing stability of liquid extraction membranes (LEM) with nuclear filters (NF), impregnated by TBP or trihexylamite is studied. LEM stability was estimated by variation of pH value in taking solution and by electric conductivity of membranes. It is stated that membrane stability increases with increase of viscosity in organic solutions. Low solubility of water in extractant also has an influence on membrane stability increase. To increase LEM stability it is suggested to use folded in two nuclear filters as a substrate. Organic solution layer thickness between NF in binary LEM is estimated on the basis of the data on gadolinium transport in the system initial solution (7.0 mol/l LiNO3, 0.1 mol/l Gd(NO3)3, pH=1.0) - membrane (1.3 mol/l tri-n-nonylamine in p-xylene) - taking solution (0.1 mol/l HNO3). Good transport properties of suggested binary LEM are detected