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2,9-二甲基-1,10-菲啰啉(DMP,新亚铜灵)对铜(Ⅰ)的选择性极好,用它作铜(Ⅰ)的显色剂已有30年历史,但文献中均言DMP与Cu(Ⅰ)形成难溶于水的络合物,因此都用于萃取光度法中,虽然有些文献介绍加入少量乙醇可以增加它在水中的溶解度,但是还未见到用于水相(特别是不加乙醇)光度法测定铜(Ⅰ)。我们从理论上进行分析研究,Cu(Ⅰ)与DMP形成正一价螯合阳离子,照理是水溶性的,其所以难溶于水而能被氯仿等萃取是由于此螯合阳离子与NO_3~-、Cl~-、SO_4~(2-)等形成缔合物之故。但从上述阴离子的水化能力来看,由于SO_4~(2-)带有两个负电荷,故其水化能力要比前两者为强,因此[Cu(DMP)_2]_2SO_4的水溶
2,9-Dimethyl-1,10-phenanthroline (DMP, Neocuproine) is extremely selective for copper (I) and has been used for 30 years as a copper (I) developer , But in the literature, DMP and Cu (I) form insoluble complexes in water and are therefore all used in the extraction spectrophotometry. Although some references describe the addition of a small amount of ethanol to increase its solubility in water, To the aqueous phase (especially without ethanol) spectrophotometric determination of copper (Ⅰ). We theoretically analyzed that Cu (Ⅰ) and DMP form positive monovalent chelating cations, which are water-soluble and insoluble in water and can be extracted by chloroform. Because of the interaction between chelating cation and NO_3 ~ , Cl ~ -, SO_4 ~ (2-) formation of associative objects so it. However, due to the hydration ability of the above-mentioned anions, the hydration capacity of SO 4 2- is stronger than that of the former two due to the two negative charges of SO 4 2-. Therefore, the solubility of [Cu (DMP) 2] 2 SO 4