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本文提出了Ｃｕ（Ⅱ）－茜素红－甲基紫－聚乙烯醇三元配合物体系分光光度法测定Ｃｕ（Ⅱ）的新方法．该方法的灵敏度高（ε＝１．１２×１０４Ｌ·ｍｏｌ－１·ｃｍ－１）选择性强，准确度好，用于测定铝合金中痕量Ｃｕ（Ⅱ）结果满意．
In this paper, a new method for the spectrophotometric determination of Cu (Ⅱ) with Cu (Ⅱ) -Alizarin red-methyl violet-polyvinyl alcohol ternary complex was proposed. The method has high sensitivity (ε = 1.12 × 104L · mol-1 · cm-1) and good selectivity. It is satisfactory for the determination of trace Cu (Ⅱ) in aluminum alloy.