摘要
We have developed a new method for the separation, preconcentration, and determination of gold(III) ion in water samples. It is based on the use of activated carbon that was modified with 1-amino-2-naphthol-4-sulfonate to yield a solid-phase sorbent. The experimental conditions for adsorption were optimized. Gold(III) can be quantitatively adsorbed at pH 3, and adsorbed gold(III) can be completely eluted with 2.0 mL of a 2% solution of thiourea in 1 M hydrochloric acid. The enrichment factor is 200, and the maximum adsorption capacity is 32 mg g?1. Gold ion was then determined by inductively coupled plasma optical emission spectrometry. The detection limit (3σ) is 0.26 μg L?1, and the relative standard deviation is 3.1% (n?=?8). Common potentially interfering ions do not interfere with the adsorption and determination of the analytes. The method displays selectivity, sensitivity and reproducibility, and was successfully applied to the determination of reference materials and water samples.