FAAS determination of Ag(I) in water, anode slime, rock and cream samples by solid phase extraction method based on sepabeads SP207/5 (p Dimethylaminobenzylidene) rhodanine combination

摘要

A simple and reliable method for separation/preconcentration of Ag(I) by using 5-(p-dimethylaminobenzylidene) rhodanine reagent and Sepabeads SP207 adsorbent prior to its determination by flame atomic absorption spectrometry (FAAS) was developed. The optimum pH of the method for separation/ preconcentration of Ag(I) was found to be 4.0. The preconcentration factor was 200. The limits of detection and quantification of the method were 0.13 and 0.44 μg L~(-1), respectively. Relative standard deviation and adsorption capacity were 1.0% and 5.40 mg g~(-1), respectively. The recovery of Ag(I) at pH 4.0 with 50 mg resin was quantitative without interferences caused by alkaline and alkaline earth cations, presenting concentrations of up to 10000 μg mL~(-1), except for K~+. The accuracy of the method was checked by analysing TMDA-70 lake water certified reference material and by addition-recovery experiments. The method was applied for the determination of Ag(I) in tap water, mineral water, sea water, anode slime, rock and cream samples.