Two types of high water absorbing resins, poly (acrylic acid-co-acrylamide) (PAAM) and poly(acrylic acid co-2-acrylamido-2-methyl-propane sulfonic acid)(PAAMPS)were synthesized by reverse suspension copolymerization. Their absorbeneies and adsorptions are investigated in distilled water, NaCl solution and various salt solutions. In initial adsorption stage, the absorbencies in distilled water, 0.9 % NaCl solution and various salt solutions and the adsorption uptakes of metal ions for PAAM and PAAMPS increase fast and both reach an equil...