THE DETERMINATION OF SAME HEAVY-METAL CATIONS BY TLC PHOTODENSITOMETRY/

The samples having complex matrices were analyzed for some heavy metal cations by using a thin layer chromatography/photodensitometry (TLC/P D) system, The rack samples mere dissolved by suitable methods. Nickel , Cobalt and Copper were dedected and analyzed by photodensitometric c omparison of corresponding spots of samples with those of standards. T he results of the same samples and standards a-ere compared with those obtained by atomic absorption measurements. Our results are comparabl e with the results of flame atomic absorption measurements. The precis ion of TLC method was calculated to be 9.4% as relative standard devia tions depending on I? replicate measurements. The accuracy of TLC meth od was also controlled by analyzing a standard reference material (SRM ) NIES No 2). The method exhibits about-2%-38% relative errors.