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本文研究了Cu（Ⅱ）－PEG（聚乙二醇-2000）－DDTC（铜试剂）－（NH4）2SO4体系的析相光度法并应用于测定Cu（Ⅱ）。最宜酸度为3．6—9．0（NaAc－HAc，NH4Cl－NH3·H2O）缓冲溶液，其络合物的最大吸收位于450nm，表观摩尔吸光系数为9．05×103L·mol－1·cm-1，Cu（Ⅱ）浓度在0—30μg／L范围内服从比耳定律，铜与DDTC形式组成为1：2的稳定络合物。该方法用于铝合金中铜的测定，获得了满意结果。
In this paper, the spectrophotometric method for the determination of Cu (Ⅱ) -PEG (polyethylene glycol-2000) -DTC (copper reagent) - (NH4) 2SO4 was studied. The best acidity is 3.6-9.0 (NaAc-HAc, NH4Cl-NH3 · H2O) buffer solution, the maximum absorption of the complex at 450nm, the apparent molar absorptivity of 9.05 × 103L · mol-1 · Cm-1, the Cu (Ⅱ) concentration in the range of 0-30μg / L obeys Beer’s law, the composition of copper and DDTC forms a stable complex of 1: 2. The method is used for the determination of copper in aluminum alloy and obtains satisfactory results.