مشخصات پژوهش

A nanohybrid based on polystyrene derivatives and magnetite was introduced as a new sorbent for pretreatment and analysis of the trace silver in environmental samples. Flame atomic absorption spectrometry was used for detection of the analyte after desorption of the extracted analytes by hydrochloric acid solution. Different variables affecting the separation/preconcentration conditions of the analyte, including pH of the sample solution, buffer concentration, amount of the sorbent, sample volume, extraction and desorbtion times, and elution conditions were investigated and optimized. Under the optimized conditions, linear calibration graph was obtained in the range of 0.01–0.11 mg L‒1 silver, with the correlation coefficient of 0.998. The enrichment factor of 50 was achieved, leading to limit of quantification of 10 μg L-1. The relative standard deviation for the determination of silver was 2.37% (n=6, silver concentration; 80 μg L‒1 ).The method was successfully applied to determine silver in natural waters and satisfactory recoveries were obtained in the range of 94–105%.