【摘要】 本文提出利用氨羧络合剂自身的切口来指示滴定终点,对那些示波图上无切口或者切口迟顿难以直接滴定的金属进行直接滴定,为CO、Ni、Mn、Ca、Mg、Sr及稀土离子的简便滴定方法.更多还原

【Abstract】 Oscillopolarographic chelometric titrations usually use the disappearance of the incisions of the electrode active ions to be titrated to indicate end-points of titrations. When the titrated ion is not electro-active, an indicator is usually required. It was found that EDTA and its related compounds such as DTPA and CyDTA could complex with Hg3+ ions produced on mercury electrode and thus yield incisions of Hg2+ complexes which could be used to indicate the end-point of the chelometric titra-tion. A series of such titrations without indicators have been developed. It was shown that direct titrations of Ca3 + , Mg3 + , Sr3 + , Ni3 + , Mn2+, Co3+ and lanthanide ions could be carried out with DTPA and CyDTA and even EDTA.更多还原