THE APPLICATION OF THE RESONANCE ENHANCED RAYLEIGH LIGHT-SCATTERING TECHNIQUE FOR THE DETERMINATION OF GOLD(III) WITH A NEW TRIAZENE REAGENT

Abstract

The resonance Rayleigh light-scattering (RRLS) signal of a new triazene reagent, 1-(p-chlorophenyl)-3-(2-thiazolyl)triazene (p-ClPTT), is first synthesized and characterized in this paper, in the 450–550 nm wavelength range is enhanced remarkably by Au^{3 +}. A new method for the determination of Au^{3 +} by the RRLS technique in the presence of Tween-20 has been developed. The calibration graph shows good linearity over a concentration range of 5.0–800 μg/l with a detection limit of 3.0 μg/l. Except for IO₄ ⁻, SCN⁻ and Pd²⁺, no other foreign ions interfere in the determination at concentrations less than 10-fold of Au^{3 +}. The method is thus simple, sensitive and of good selectivity, and has been successfully used for the determination of trace gold in the ore samples.

Keywords:

• Gold(III)
• Resonance Rayleigh light-scattering
• Triazene reagents

ACKNOWLEDGMENT

The calculation software (GAUSSIAN 94) was provided by Dr. Baotao Fan (University Parts 7-Denis Diderot), We wish to express our heartfelt thanks to him for his warm-hearted help.