Synthesis/characterization of a new chelating resin and on-line solid phase extraction for the determination of Ag(I) and Pd(II) from water, cream, anode slime and converter samples by flow injection flame atomic absorption spectrometry

On-line preconcentration procedures for the determination of Ag(I) and Pd(II) by flame atomic absorption spectrometry have been described. A new chelating resin, poly (N,N′-dipropionitrilemethacrylamide-co-divinylbenzene-co-2-acrylamido-2-methyl-1-propane sulfonic acid) was synthesized and used as a new adsorbent material. The resin was characterized by Fourier transform infrared spectroscopy and elemental analysis. Ag(I) was adsorbed on the chelating resin at pH 5.0 and eluted with 1.0molL−1 HNO3. Pd(II) was retained at pH 9.5 and eluted with 1.5molL−1 HCl. The experimental parameters (pH, type and concentration of eluent, flow rates of sample and eluent solutions, elution time and the effect of interfering ions) for both Ag(I) and Pd(II) were investigated in detail. The detection limit for Ag(I) was 2.4μgL−1 and the relative standard deviation was 2.9% for 0.2μgmL−1 Ag(I). The detection limit for Pd(II) was 1.7μgL−1 and the relative standard deviation was 2.8% for 0.3μgmL−1 Pd(II). Accuracy was confirmed by analyzing a certified reference material (TMDA-70), recovery studies on real samples and comparison with electrothermal atomic absorption analysis. The proposed methods were successfully applied to the on-line determination of Ag(I) in bottled water, pharmaceutical cream and anode slime samples and Pd(II) in bottled water and catalytic converter samples. ► A new chelating resin was synthesized. ► The resin was characterized by FTIR and elemental analysis. ► Overall time required for on-line preconcentration of both Ag(I) and Pd(II) was 3.76min. ► The high preconcentration factors of 43 for Ag(I) and of 57 for Pd(II) were obtained. ► On-line determination of Ag(I) and Pd(II) in bottled water, cream, anode slime and converters.