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提出了“等色染料离子对萃取光度法”，该方法由于萃取液中等色染料离子对ＴＢＦＢＲＢ２和三元缔合物［Ｃｕ（ＣＮ）２］ＢＲＢ两者的吸光作用，因而具有较高的灵敏度，ε＝２．４５×１０５Ｌ．ｍｏｌ－１．ｃｍ－１。铜含量在０～２．５４μｇ／１０ｍｌ范围内遵从比尔定律。对含铜１０－８ｇ／ｍｌ的水样进行测定，变异系数为３．６％。并且本方法用铜的特效试剂分离铜，选择性也好。
In this paper, a new method called “isochroic dye ion pair extraction spectrophotometry” is proposed. This method has high sensitivity due to the absorption of TBFBRB2 and Cu (CN) 2] BRB in the extract by the leuco dye ions. , Ε = 2.45 × 105L. mol-1. cm-1. Beer’s law is obeyed in the range of 0 ~ 2.54μg / 10ml. Water samples containing 10-8g / ml of copper were measured with a coefficient of variation of 3.6%. And the method of separation of copper copper special reagents, the selectivity is good.