Spectrophotometric Determination of Gold (III) using Tolterodine Tartrate (TLD) (R)-N, N-Diisopropyl-3-(2-Hydroxy-5-Ethylphenyl)-3-Phenylpropanamine L-Hydrogen Tartrate Reagent

A Tolterodine tartrate (TLD) (R)-N, N-diisopropyl-3-(2-hydroxy-5-ethylphenyl)-3-phenylpropanamine L-hydrogen tartrate reagent. Its molecular formula and molecular weight are C26H37NO7 and 475.6 respectively, was employed for the sensitive spectrophotometric determination of gold(III). The gold(III) ion forms a violet-colored complex with TLD in an aqueous solution at pH 4.0. The gold complex shows the absorption maximum at 540 nm, and Beer, s law obeyed in the range of 4.9 – 78.7 µg/ml. The molar absorptivity and sandell,s sensitivity were found to be 2.41 x 103 mol-1 cm-1 and 0.0817 µg/cm2 respectively. The complex shows 1:1 [Au (III): TLD] stochiometry with a stability constant of 9.98 x 104. The interference effect of various diverse ions has been studied. In addition to zero- order, first derivative spectrophotometric methods was also developed for the determination of gold (III) in trace amount which was more sensitive than the zero-order method. The developed method has been used for the determination of gold (III) in various kinds of alloys. The results were in excellent agreement with certified values.