The influence of some
experimental parameters on the extraction behaviour of each metal
ion, such as: the amount of added iodide extractant, type of
inorganic salt, the volume ratio of the aqueous two-phase system
phases and the salt solution pH was separately analyzed. On the
basis of obtained experimental results a selective extraction procedure
in two steps of these metal ions was proposed. This procedure
does not involve the use of organic solvents, and from this reason
can be considered environmental safe.