Abstract：An analysis method of silver content by resonance scattering was established using sodium 1,2-naphthoquinone-4-sulfonate as spectral probe based on its complexation action with silver. There was no obvious scattering peak for sodium 1,2-naphthoquinone-4-sulfonate solution in Walpole (HCl-NaAc) buffer solution at pH 5.0. After adding Ag+, a complex was formed due to the complexation between Ag+ and 1,2-naphthoquinone-4-sulfonate, thus generating a strong resonance scattering peak at 294nm. Under the optimal experimental conditions, there was a good linear relationship between the resonance scattering intensity (ΔI294nm) and the mass concentration of Ag+ in range of 0.0050-4.0μg/mL. The limit of detection was 18.2ng/L. Moreover, the common metal ions and nonmetal ions had no interference with the determination of Ag+. The proposed method was applied for the determination of trace silver in waste film. The relative standard deviation (RSD, n=5) of results was 2.1%-4.8%. The recoveries were between 99% and 101%. The determination results of this method were consistent with those obtained by atomic absorption spectrometry (AAS).
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