【摘要】 本文研究了铁（Ⅲ）－ＰＥＧ（聚乙二醇－２０００）－铬菁Ｒ－Ｎａ２ＳＯ４体系的析相光度法并应用于测定Ｆｅ（Ⅲ）。最适酸度为４．５～６．５（ＮａＡｃ－ＨＡｃ）缓冲溶液，其络合物的最大吸收位于５６０ｎｍ，表观摩尔吸光系数为５．３６×１０４Ｌｍｏｌ－１ｃｍ－１，Ｆｅ（Ⅲ）浓度在０～４０μｇ范围内服从比尔定律，铁与铬菁Ｒ形式组成为１２的稳定络合物。该方法用于茶叶中铁的测定，获得了满意结果。更多还原

【Abstract】 Spectrophotometric determination of iron by using eriochrome cyanine R as extractant and color developing agent in organic solvents was studied.The complex was extracted by PEG phase from the water solutions of pH4 5～6 5 (NaAc HAc).The maximum absorption of the complex is at 560 nm and the molar absorptivity is 5 36×10 4 L·mol -1 ·cm -1 .Beers law was obeyed in the range of 0 40 μg Fe.Iron and eriochrome cyanine R formed a stable complex with a molar ratio of 1∶2.The proposed method has been applied to the determination of copper in aluminium alloys with satisfactory results.更多还原