Spectrophotometric Determination of Micro Amounts of Gold(III) Using Cyclopentane-spiro-2´ -(1-Methyl-2´ ,4´ -Dithio)-s-Triazine

Abstract

Gold(III) forms an intense yellow soluble complex with cyclopentane-spiro-2´, (1-methyl-2´ ,4´ -dithio )-s triazine (CPSMDTT) in acidic medium. The complex gives maximum absorption at 435nm in the pH range 3.8 to 4.0. Beer's law is obeyed over the range 1 to 7 ppm of Au(III). The molar absorptivity and Sandell's sensitivity of the complex are 1.28 x 10⁴ dm³ mol^–1 cm^–1 and 0.015 μg cm^–2, respectively. Standard deviation is evaluated to be 0.69. The composition of the complex is established by Job's method and mole ratio method as 1 : 3, (Au(III): CPSMDTT). The effect of various diverse ions is also studied.