polyelectrolyte multilayers on magnetic silica as a new sorbent for the separation of trace silver in the leaching solutions of antibacterial products and determination by flame atomic absorption spectrometry

a novel, magnetic silica sorbent with polyelectrolyte multilayers (pems) on its surface was prepared, and was used for magnetic solid phase extraction (mspe) of trace a+ via flame atomic absorption spectrometry (faas). the experimental parameters for the mspe procedure, such as the ph, type, and concentration of eluent, ultrasonic time and effects of co-existing ions were investigated. the detection limit of the developed method was 0.17 ng/ml for ag+ with an enrichment factor of 35. this method was also successfully applied to the determination of trace ag+ in the leaching solution of different antibacterial products with satisfactory results.