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提出了Ｃｕ（Ⅱ）－茜素红Ｓ－甲基紫－聚乙烯醇三元配合物体系光度法测定Ｃｕ（Ⅱ）的新方法。该方法灵敏度高（ε＝１．１２×１０４Ｌ·ｍｏｌ－１·ｃｍ－１），选择性好，精密度可靠，用于测定化学试剂中的痕量Ｃｕ（Ⅱ），结果满意。
A new method for the determination of Cu (Ⅱ) with Cu (Ⅱ) -Alizarin red S-methyl violet-polyvinyl alcohol ternary complex was proposed. The method has high sensitivity (ε = 1.12 × 104L · mol-1 · cm-1), good selectivity and precision, and is used to determine the trace amount of Cu (Ⅱ) in chemical reagents. The results are satisfactory.