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本文将某些有机多膦酸螯合剂与 Cu~(2+)、Zn~(2+)、Co~(2+)、Ni~(2+)、Cd~(2+)及 Mn~(2+)形成的螯合物的稳定常数,与 EDTA 或 NTA 等氨羧络合剂的相应螯合物的稳定常数进行了比较,发现有机多膦酸螯合剂,特别是氮川三甲撑磷酸(NTMP),是 Cu~(2+)的最优选择螯合滴定剂。用公式 PM+ΔlogK=8判断几种金属离子对螯合滴定铜的干扰程度,与实验结果基本一致。选用的三种不同有机多膦酸,采用铬天青 S 作指示剂,螯合滴定合金或矿石中的铜,可以获得满意的结果。
In this paper, some organic polyphosphonic acid chelating agents and Cu2 +, Zn2 +, Co2 +, Ni2 +, Cd2 + and Mn2 +), And the stability constants of the corresponding chelates of the ammonia-carboxyl complexing agent such as EDTA or NTA were compared, and it was found that the organic polyphosphonic acid chelating agent, in particular, nitrilotriacetic acid (NTMP ), Is the best choice of Cu ~ (2+) chelating titrant. Using the formula PM + ΔlogK = 8 to determine the degree of interference of several metal ions chelating titration of copper, and the experimental results are basically the same. Selected three different organic polyphosphonic acid, chrome azure S as an indicator, chelation titration alloy or copper ore, you can get satisfactory results.