A simple, safe and rapid method on the basis of cloud point extraction(CPE) with tergitol TMN-6 had been used for the preconcentration and extraction of gold(Au) ion in selenium reduction solution sample prior to flame atomic absorption spectrometry (FAAS).Pyrrolidine dithio fromic acid salt(PDFAS)which was regarded as a selective complexing agent could formed stable Au-complex with Au ion, and Au-complex could be extracted by TMN-6 at a short time. Some influencing factors such as sample pH, concentration of TMN-6, concentration of PDFAS and the effect of foreign ions were further researched .Under the optimum conditions, the limit of detection(LOD) was 1.3μg L-1,the calibration graph was linear in the range of 0-500μg/L and the relative standard deviation(RSD%) was 2.0%(n=8). The CPE method had been shown to be a useful and effective methodology for the separation of Au, with a preconcentration factor of 30. The recoveries of the spiked Au(Ⅲ) ions were got in the range 95–103%.

Xuan Zhou, Pingyan Wang, Yu Zhao, Shuangqiao Ju and Mousheng Liu