In the recent years, pollution of the environment by heavy metals has received considerable attention. These elements accumulate in living organisms and are of high toxic potential 1-3. For determination of the trace amount of silver, a separation and a pre-concentration step are usually required before their analysis. This is due to their frequent low concentrations and the matrix effects in the environmental samples 4. However, liquid-liquid extraction (LLE), as the oldest pre-concentration and separation technique in analytical chemistry, is time-consuming and