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Vol. 25 No. 4 (2013): Vol 25 Issue 4

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Cloud Point Extraction Coupled with Ultrasonic-assisted for Determination of Au and Ag in Water Samples by Flame Atomic Absorption Spectrometry

https://doi.org/10.14233/ajchem.2013.13398
Zonghao Li
Faculty of Life Science and Technology, Kunming University of Science and Technology, Yunnan Province 650500, P.R. China
Wei Zhen
Kunming Fruit Business and Economics Co. Ltd., Kunming 650106, P.R. China
Zhigang Tai
Faculty of Life Science and Technology, Kunming University of Science and Technology, Yunnan Province 650500, P.R. China
Yaling Yang
Faculty of Life Science and Technology, Kunming University of Science and Technology, Yunnan Province 650500, P.R. China
Jun Song
Faculty of Life Science and Technology, Kunming University of Science and Technology, Yunnan Province 650500, P.R. China
Yuanpei Lian
Faculty of Life Science and Technology, Kunming University of Science and Technology, Yunnan Province 650500, P.R. China

Corresponding Author(s) : Yaling Yang

yilyil8@163.com

Asian Journal of Chemistry, Vol. 25 No. 4 (2013): Vol 25 Issue 4

Abstract

A simple and practical preconcentration method was developed for the cloud point extraction of gold and silver. The method is based on the formation of hydrophobic complexes of gold and silver ions with sodium diethyldithiocarbamate (Na-DDTC) and Dow Corning DC-193 was added as a non-ionic surfactant. The phase diagrams of the binary system, water-surfactant (DC-193) and the ternary system, water-surfactant-fatty acids (nonanoic acid), were determined. Under the optimal conditions, the calibration curves were linear in the range of 10-500 μg/L and 10-800 μg/L with the detection limits of 3.4 μg/L and 2.7 μg/L for gold and silver, respectively. The enrichment factors are 25 and 20 for gold and silver, respectively. The relative standard deviations are 3.6 % for gold and 3.4 % for silver (n = 11). The method was successfully applied to the determination of gold and silver in water samples.

Keywords

Gold Silver Dow Corning DC-193 Cloud point extraction Flame atomic absorption spectrometry
Li, Z., Zhen, W., Tai, Z., Yang, Y., Song, J., & Lian, Y. (2012). Cloud Point Extraction Coupled with Ultrasonic-assisted for Determination of Au and Ag in Water Samples by Flame Atomic Absorption Spectrometry. Asian Journal of Chemistry, 25(4), 2208–2212. https://doi.org/10.14233/ajchem.2013.13398
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