Abstract

Sajjd Heidary Fathabad and Siavash Hasanvandi*

This paper is devoted to an investigation carried out on a simple, rapid and sensitive method, which is proposed for selective determination of ultra trace amounts of silver from water and biological samples. The method is based on highly efficient separation and pre-concentration of silver by dispersive liquid-liquid microextraction (DLLME) and determination with graphite furnace atomic absorption spectrometry (GFAAS). 1-(2-pyridylazo)-2-naphtol (PAN) was used as a silver chelating agent prior to extraction. Parameters such as type and volume of extraction solvent, type and volume of dispersive solvent, pH, extraction time and concentration of the chelating agent have been optimized. Liner range of calibration curve, detection limit and relative standard deviation were 0.2-6.0 ng mL^-1, 0.02 ng mL^-1 and 4.4 C/o, respectively. Silver determined successfully with this method in real samples. 

Silver; 1-(2-pyridylazo)-2-naphtol (PAN); water and biological samples analysis

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