Preconcentration of Cu(II) and Ni(II) ions in edible fish organs by solid phase extraction using triton X-100 resin

An enrichment separation procedure for the atomic absorption spectrophotometric determinations of Cu(II) and Ni(II) ions in common edible fishes was established. The 2-(2-hydroxynaphthalen-1-yl)diazenyl]-5-methylbenzene-1,3-diol (HNDMD) complexes of the analyte ions at pH 6.0 were adsorbed on the p-octylpolyethylene glycolphenylether (Triton X-100) column and then desorbed with 10 mL of acetone. Under optimized conditions, the recovery values were above 95%. The developed preconcentration methods were successfully applied to the determination of Cu(II) and Ni(II) ion concentrations in common edible fishes from the local market. The precision and accuracy of the method are very good.