Validation parameters after the evaluation of a core-shell polymer microspheres with strong cation-exchange character for the extraction of basic pharmaceuticals from environmental water samples that inclued river (1 file), effluent (1 file) and influent (1 file). The parameters are apparent recovery at two levels of concentration, relative recoveries and matrix effect.

The terms evaluated for each type of sample (river and effluent and influent sewage) are: %Rapp = Apparent recovery %Rrel = Relative recovery %ME = matrix effect