Through joined two sensitive methods solvation and cloud point extraction separated and determined micro amount of Ce(III) from aqueous solutions by using organic reagent 2,4-Dimethyl pentan-3-one (2,4-DMP) as extractant and non-ionic surfactant 1% TritonX-100 , the experimental study shows the solvation species of Ce+3 extracted into cloud point layer (CPL) have a wavelength for maximum absorbance was λmax =295nm and the laboratory experiments appear needed as optimum concentration of salting out KNO3 was 0.6 M in the presence 100µg Ce+3/10mL and 1x10-4 M (2,4-DMP) so that 0.5 mL of 1% Triton X-100as well as after heating the solution at 90C° for 15 minutes the study involved effect of different kind and concentration of salting out , and interferences so that effect of different organic reagent as extractants, also stoichiometry study demonstrated the more probable structure of solvation extracted species was 1:1 2,4-DMP: Ce(NO3)3 with spectrophotometric determination.