Document Type: Research Paper
Department of Chemistry, Arak Branch, Islamic Azad University, Arak, Iran
In this research, a highly sensitive, selective, rapid and simple micro-funnel magnetic stirringassisted liquid–liquid microextraction (MF-MSA-LLME) method combined with flame atomic absorption spectrometry (FAAS) was introduced for the preconcentration, extraction, and measurement of trace amounts of silver ion. In this method 1-(2–Pyridylazo)-2-naphthol (PAN) and 1-octanol were used as chelating agent and extraction solvent. Effective parameters on extraction efficiency such as pH of sample solution, type and volume of extraction solvent, amount of ligand, extraction time, and ion strength were investigated and optimized. Under the optimum conditions, calibration curve was linear in the range of 2-250 μg L-1 with correlation of coefficient r2=0.997. Detection limit, relative standard deviation and the enrichment factor were 0.251 μg L-1, 4% (n=7,
C=80 μg L-1) and 135, respectively. The proposed procedure was successfully applied for the preconcentration and determination of trace amount of silver in water samples with good accuracy and good validity.