【摘要】 <正> 铜的螯合滴定剂,常用氨羧络合剂。最近又提出用氮川三甲撑膦酸（NTMP）螯合滴定铜,选择性优于前者。乙二胺四甲撑膦酸（EDTMP）能与多种金属离子生成螯合物,文献用作一些金属离子的螯合滴定剂,但仅用红紫酸铵作指示剂,研究在不同pH下滴定Cu、Co、Ni及Zn的可能性,未作详细的条件试验和应用研究,更无实物分析的报导。本文拟从理论上计算Cu²⁺、Zn²⁺、Co²⁺、Ni²⁺、Cd²⁺及Mn²⁺与EDTMP螯合物的表观稳定常数,提出适宜的选择滴定铜的条件。用铬天青S作指示剂,以溴化十六烷基三甲铵更多还原

【Abstract】 The apparent stability constants for the complexes of ethylenedia minetetramethylphosphonic acid (EDTMP) with Cu, Zn, Co(Ⅱ), Ni, Cd and Mn(Ⅱ)ions in a medium of 0.1M succinic acid have been calculated.The EDTMP is found to be a selective titrant for copper when titrated at pH 6.1 using chromazurol S as an indicator in the presence of cetyltrimethylammonium bromide. The end point is very sharp, and the results are accurate enough. This method is simple and rapid for the determination of copper in some alloys.更多还原