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Pibil等人的研究发现,在pH超过4的溶液中,1-羟基乙叉-1,1-二膦酸(HEDP)与钍的EDTA(或DCTA)络合物能生成无色可溶性的双核三元络合物,由于反应具有很高的选择性,故可作为钍的高选择性滴定剂。本文基于该络合物在pH5～6溶液中较Th~(4+)、EDTA与二甲酚橙三元络合物ThY-XO稳定这一性质,以硝酸钍为标准溶液,二甲酚橙为指示剂,对HEDP产品及镀铜溶液中的HEDP分析方法进行了试验。
The Pibil et al. Study found that EDTA (or DCTA) complex of 1-hydroxyethylidene-1,1-diphosphonic acid (HEDP) with thorium can form a colorless, soluble Binuclear ternary complexes, as the reaction has a high selectivity, it can be used as a high selectivity of thorium titrant. In this paper, based on the stability of this complex at pH5 ~ 6 compared with Th ~ (4 +), EDTA and xylenol orange ternary complex ThY-XO, with thorium nitrate as a standard solution, xylenol orange As indicators, HEDP products and copper plating solution HEDP analysis method was tested.