Abstract
The organic reagent, 4-(p-phenyl azo sulfonic acid)-1-naphthol), was found to be sensitive and selectivereagent for the spectrophotometric determination of trace amounts of Cobalt and Nickle. The preparedcomplexes and azo reagent were characterized using FT-IR and UV-Vis spectroscopic method. The complexeshave a maximum absorption at (453) nm and (446) nm for both Cobalt (II) and Nickle (II(respectively,Beer›s law was obeyed in the range (0.5-2.5) ppm of Cobalt and molar absorptivity ? = 3.24 × 104 L.mole-1.cm-1, as for Nickle, the range was (0.1-2) ppm and molar absorptivity ? =) 0.96×104(L.mol-1.cm-1. Theaccuracy and reproducibility of the determination method for various known amounts of cobalt (II) andNickle (II(were tested . The results obtained are both precise (RSD was better than 1.6 %, 3 %) for bothCobalt (II) and Nickle (II(respectively and accurate (relative error was better than 1 %, 2 %) for both Cobalt(II) and Nickle (II(respectively
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