Spectrophotometric Determination of Copper (II) with 3-Hydroxy-3-m-Tolyl-1-p-Sulphonato (Na-Salt) Phenyltriazene

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3-hydroxy-3-m-tolyl-1-p-sulphonato (Na-Salt) phenyltriazene has been used for the spectrophotometric determination of Cu(ll). The reagent forms 1:2 yellow complex with copper at pH 6.4 to 6.9 with λ_max at 402 nm. At working wavelength 418 nm, values of molar absorptivity, Sandefl's sensitivity, stability constant (log p) and free energy of formation were found to be 7,037 l/mole cm, 9.02 ng/cm2, 9.02. (from Harvey and Mannings method) and -12.30 K. Cal/mole respectively. Beer's law is obeyed in the entire concentration range studied i.e. 2.0 x 10-5 M to 1.2 x 10-4 M. It was possible to determine copper (6.35 mg) in presence of equimolar amount of eighteen cations and anions.

Hydroxy; spectrophotometric; phenyltriazene equimolar