In the present work, trace of cobalt(II) ions in aqueous sample is synthesized by chemically converted graphene (CCG) sheets of C₁₈ in order to improve the performance of extraction and preconcentration. Calculation of the ion density in solution was performed by the method of flame atomic absorption spectrometry. The effective parameters on extraction such as: effect of pH, the amount and eluent solvent, time of extraction and effect of other cation were optimized. Concentrate factor was found 40 and LOD method of limit of detection was found to be 0.032μg.L⁻¹ The relative standard deviation is 0.81% (RSD%).

cobalt(II), preconcentration, solid phase extraction, chemically converted graphene (CCG) sheets, flame atomic adsorption spectrometry (FAAS).