摘要
在HAc-NaAc（pH=5.0）酸性溶液中,以邻菲罗啉为活化剂,以银催化过硫酸钾氧化亚甲基蓝的反应,建立了一种催化动力学光度法测定痕量银的新方法,并尝试应用于氯化银溶度积和黑白照相纸中的痕量银的测定试验.实验结果表明：在实验确定的最佳条件下,该方法对银的最低检出限为1.12×10^-6g/L,相对标准偏差为2.3%,测定的线性范围为0.01-0.12 mg/L,回收率高.对银的测定试验结果令人满意.
A new catalytic kinetics spectrophotometric method for the determination of trace silver has been developed in HAc-NaAc（pH = 5.0） buffer medium, basing on the catalytic oxidation of methylene blue by potassium persulfate in the presence of 1,10-phenanthroline as an activator. This method has been applied to determine the solubility product of silver chloride, and the trace silver in the solution of the black ＆ white photographical paper. The results show that under the best conditions, the detection limit is 1.12×10^-6g/L, the relative standard deviation is 2.3%, the linear range of determination is 0.02- 0.12 mg/L for Ag（ Ⅰ ）. It could get the high reclaim rate and the results of determination were very good.
出处
《延边大学学报（自然科学版）》
CAS
2007年第2期114-119,共6页
Journal of Yanbian University（Natural Science Edition）
关键词
痕量银
测定
催化光度法
trace silver
determination
catalytic kinetics spectrophotometric method
