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在ｐＨ４．５的 ０．０１５ ｍｏｌ／Ｌ ＨＡｃ－ＮａＡｃ介质中，Ｉｎ铟（Ⅲ）－７－（１－苯偶氮）－８－羟基喹啉－５－磺酸钠（ＢＱ）在滴汞电极上于－０．６６５－０．７０ Ｖ（ｖｓ．ＳＣＥ）电位处得到络合物的吸附还原波，其一阶导数峰电流Ｉ＇ｐ与Ｉｎ（Ⅲ）浓度在４．０× １０~（－８）～３．５ × １０~（－６）ｍｏｌ／Ｌ范围内呈良好的线性关系，检测限为１．６ × １０~（－８）ｍｏｌ／Ｌ Ｉｎ（Ⅲ）．应用该法测定了铅粉和氢氧化铝样品中的微量铟，结果令人满意。对电极反应机理进行了探讨。
In the 0.015 mol / L HAc-NaAc medium at pH 4.5, sodium indium (III) -7- (1-phenylazo) -8-hydroxyquinoline-5-sulfonate (BQ) The adsorption reduction of the complex was obtained at the potential of -0.665-0.70 V (vs.SCE). The first derivative peak currents I’p and In (Ⅲ) were in the range of 4.0 × 10 ~ (-8) ~ 3.5 × 10 -6 mol / L, the detection limit was 1.6 × 10 -8 mol / L In (Ⅲ). The method was applied to the determination of trace indium in lead and aluminum hydroxide samples with satisfactory results. The electrode reaction mechanism was discussed.