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A simple spectrophotometric method for determination of gold (III) in aqueous samples

2008; Elsevier BV; Volume: 22; Issue: 2 Linguagem: Inglês

10.1016/j.mineng.2008.05.012

1872-9444

Yousef Fazli, Jalal Hassan, Mohamad-Hadi Karbasi, Masomeh Sarkouhi,

Water Quality Monitoring and Analysis

A simple method for rapid determination of trace Au in natural water was presented by using UV–vis spectrophotometry after reaction of gold (III) with 3,3′, 5,5′-tetramethylbenzidine hydrochloride (TMBH) in acidic solution. Under the optimum conditions, in a concentration range of 100–2000 μg L−1 of Au (III) a good linear calibration graph was obtained (r = 0.9969, n = 7). The percent relative standard deviation (RSD) for determination of 1000 μg L−1 Au was 10% (n = 3) and limit of detection based on a signal-to-noise ratio (S/N) of 3 (3Sbl) was 50 μg L−1. The proposed method has been successfully applied to the determination of gold spiked and real aqueous samples.