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研究了Ｃｕ（Ⅱ）－ＰＥＧ（聚乙二醇－２０００）－ＢＣＯ（新铜试剂）－（ＮＨ４）２ＳＯ４体系的萃取光度法并应用于测定Ｃｕ（Ⅱ）。结果表明最适宜酸度为ｐＨ８～９．５（ＮＨ４Ｃｌ－ＮＨ３·Ｈ２Ｏ缓冲溶液），络合物最大吸收波长位于６００ｎｍ，表观摩尔吸光系数为２．７４×１０４，Ｃｕ（Ⅱ）浓度在０～６４μｇ／１０ｍｌ服从比尔定律，铜与ＢＣＯ组成了１：３的稳定蓝色络合物。该方法用于铝合金中铜的测定，获得了满意的结果。
The extraction spectrophotometry of Cu (Ⅱ) -PEG (polyethylene glycol-2000) -BCO (new copper reagent) - (NH4) 2SO4 was studied and applied to the determination of Cu (Ⅱ). The results showed that the most suitable acidity was pH8 ~ 9.5 (NH4Cl-NH3 · H2O buffer solution), the maximum absorption wavelength of the complex was at 600nm, the apparent molar absorptivity was 2.74 × 104 and the Cu (Ⅱ) 64μg / 10ml subject to Beer’s Law, copper and BCO formed a stable blue complex 1: 3. The method is applied to the determination of copper in aluminum alloy and obtains satisfactory results.