过硫酸钾氧化偶氮荧光桃红催化光度法测定痕量银

Catalytic Spectrometric Determination of Trace Silver Via Using Oxidation of Azophloxine with Potassium Persulfate

以过硫酸盐氧化偶氮类试剂催化动力学法测定银,多数线性范围较窄、选择性欠佳。本文建立了以偶氮荧光桃红作指示物质、α,α′-联吡啶作活化剂的催化光度法,测定痕量银检出限为1.0×10-4μg/mL,线性范围2.0×10-4～4.0×10-2μg/mL,灵敏度高,选择性好。用于测定鄂铜矿中银,结果满意。采用自装的微机动力学数据处理系统,测试简便、准确。

Based on the catalytic effect of Ag(Ⅰ) on the oxidation of azophloxine with potassium per-sulfate in the presence ofα,α' -bipyridyl as an activator, a new catalytic spectrophotometric method for determining trace amounts of Ag(Ⅰ) is studied. The limit of detection for Ag is 1. 0×10-4μg/ mL. The linear range of determination of silver is 2. 0×10-4~4. 0×102 μg/mL. The method has been used to determine trace Ag in ores with satisfactory results.