【摘要】 <正>镍(Ⅱ)—邻菲啰啉—酸性染料三元离子缔合物萃取分光光度法测定镍的研究已有一些报导,所用的酸性染料均属氧蒽酮染料,如曙红、赤藓红、萤光桃红等。我们发现用溴甲酚绿作酸性染料,所形成的三元离子缔合物对镍亦有很高的灵敏度,其摩尔吸光系数可达6.0×10~4,且试剂空白低,选择性亦较好。本文研究了镍(Ⅱ)—邻菲啰啉(Phen)—溴甲酚绿(BCG)三元络合物形成和萃取条件,以及它的分光光度特性和络合物的组成,并拟定了铝中微量镍的测定方法。更多还原

【Abstract】 The complex formation in the Ni( n )-1,10-phenanthroline-bromocresol green system was studied spectrophotometrically in aq. and org. phases.Two complexes were formed in the ag. phase with the ratio Ni:phen :BCG = 1:3:1 and 1:2:2The 1:3:1 complex was extracted into CHC13 and used for the spec-trophotometric determination of Ni. The absorbance of the complex was measured against reagent blank at 620nm. The optimum pH for the extraction is 9-9.5 the molar absorptivity of the complex is 6.0×104 in CHCl3. Beer’s law was obeyed for 1-5μg Ni/5ml.An extraction-photometric method is described for determination of Ni in Al.更多还原