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基于在HAc-NaAc介质中,以2,2’-联吡啶为活化剂,银(Ⅰ)可灵敏地催化过硫酸铵与邻甲氧基酚的氧化还原显色反应,研究了反应的最佳条件及动力学参数,并对反应机理作了探讨,从而实现了痕量银的催化动力学光度法测定.方法的线性范围为0～1.2mg/L,检测限为8.08×10~(-8)g/L.用于铅锌矿废渣中银的测定,结果满意.
Based on the redox chromogenic reaction of ammonium persulfate with o-methoxyphenol catalyzed by silver (Ⅰ) in HAc-NaAc medium with 2,2’-dipyridyl as activator, the best reaction Conditions and kinetic parameters were discussed, and the reaction mechanism was discussed to achieve the determination of trace silver by catalytic kinetic spectrophotometry.The linear range of the method was 0 ~ 1.2 mg / L with the detection limit of 8.08 × 10 -8 ) g / L. For the determination of silver in lead-zinc ore waste residue, the results are satisfactory.