ANALYTICAL APPLICATIONS OF TRIETHYLENETETRAMINEHEXAACETIC ACID .3. AMPEROMETRIC DETERMINATION OF CALCIUM IN ALKALI-METAL SALTS

被引：4

作者：

RUBEL, S

WOJCIECHOWSKI, M

机构：

[1] Institute of Fundamental Problems in Chemistry, University of Warsaw

来源：

ANALYTICA CHIMICA ACTA | 1979年 / 109卷 / 01期

关键词：

D O I：

10.1016/S0003-2670(01)84228-8

中图分类号：

O65 [分析化学];

学科分类号：

070302 ; 081704 ;

摘要：

Triethylenetetraminehexaacetic acid (TTHA) is proposed for the amperometric titration of small amounts of calcium in strongly alkaline medium. The reduction current of added lead(II) ions serves to indicate end-points; at pH 13 the Ca-TTHA complex is more stable than Pb-TTHA. Oxygen need not be removed when square-wave polarography is used to measure the indicator current. More than 10-4% of calcium can be determined in NaOH, KOH, NaClO4 and LiClO4 (analytical grade) with good precision. Atomic absorption spectrometry was used to obtain comparative results, but the amperometric method was more satisfactory. © 1979.

引用

页码：67 / 72

页数：6

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