析相光度法测定铜（Ⅱ）的研究

Study on Spectrophotometric Determina-tion of Copper by Using Zincon as Extractantwith Phase-separation

本文研究了Ｃｕ（Ⅱ）－ＰＥＧ（聚乙二醇－２０００）－Ｚｉｎｃｏｎ（锌试剂）－（ＮＨ＿４）＿２ＳＯ＿４体系的析相光度法并应用于测定Ｃｕ（Ⅱ）。最宜酸度为ｐＨ５．５～８．５（ＫＨ＿２ＰＯ＿４－Ｋ＿２ＨＰＯ＿４缓冲溶液），其络合物的最大吸收位于６１０ｎｍ，表观摩尔吸光系数为４．０×１０￣４Ｌ·ｍｏｌ￣（－１）·ｃｍ￣（－１），Ｃｕ（Ⅱ）浓度在０～１．５ｍｇ／Ｌ范围内服从比尔定律，铜与Ｚｉｎｃｏｎ形式组成为１：２的稳定的蓝色络合物。该方法用于铝合金中的铜的测定，获得了满意结果。

In PEG-zincon-(NH_4)_2SO_4 System,thespectrophotometric determination of copper byusing zincon as extractant and color-develop-ing agent with non-organic solvents was stud-ied.The complex was extracted by PEG phasefrom the water solutions of pH 5.5～8.5(KH_2PO_4-K_2HPO_4).The maximum absorptionof the complex is at 610nm and the molar ab-sorptirity is 4.0×10￣4L·mol￣(-1)·cm￣(-1),Beer’slaw is obeyed in the range of 0～1.5mg/L Cu,Copper and zincon form a stable blue complexwith a molar ratio of 1:2,The proposedmethod has been applied to the determinationof copper in aluminium alloys with satisfactoryresults.