Azotobacter vinellandii A3 was isolated from corn field at College of Agriculture in Abu-Ghraib – Baghdad , alginate of A. vinellandii A3 was extracted and partial purified, Analysis of alginate by Fourier Transform Infrared spectrometry (FTIR) shows that the extracted alginate contain bending acetyl group in 1620.09 1/cm, stretching OH group in 3417.63 1/cm , and C-O-C bending group in 1072.35 and 1026.06 1/cm , the ability of alginate of A. vinellandii A3 to adsorb heavy metal ions (Cu+2 , Zn+2 ) at different conditions was studied, the optimum conditions for adsorption process were determined, alginate has a high affinity and binding capacity for Cu+2 and Zn+2 ions, and the best adsorption level occurred after 10 hrs of treatment. Addition 150 ml of 1% alginate to 50 ml of solutions contain Cu +2 ions or Zn +2 ions, alkaline pH (9) was more suitable for Cu+2 and Zn+2 adsorption than neutral or acidic pH.
