Spectrophotometric Determination of Gold (III) using Tolterodine Tartrate (TLD) (R)-N, N-Diisopropyl-3-(2-Hydroxy-5-Ethylphenyl)-3-Phenylpropanamine L-Hydrogen Tartrate Reagent
SK. Rafi *
Department of Chemistry, Priyadarshini College of Engineering and Technology, Nellore 524004, India
D. Venugopal Rao
Integrated Product Development Dr. Reddy’s Labaratories. Hyderabad, India
T. Sreenivasulu Reddy
Depatment of Chemistry, Sri Krishnadevaraya University. Anathapur-515003, India
*Author to whom correspondence should be addressed.
Abstract
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.
Keywords: Gold(III) determination, (R)-N, N-diisopropyl-3-(2-hydroxy-5-ethylphenyl)-3-phenylpropanamine L-hydrogen tartrate(TLD) reagent, Spectrophotometry, Derivative spectrophotometry