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Metallindikatoren VII. Ein auf Erdalkaliionen ansprechendes Phtalein und seine analytische Verwendung
Author(s) -
Anderegg G.,
Flaschka H.,
Sallmann R.,
Schwarzenbach G.
Publication year - 1954
Publication title -
helvetica chimica acta
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.74
H-Index - 82
eISSN - 1522-2675
pISSN - 0018-019X
DOI - 10.1002/hlca.19540370114
Subject(s) - chemistry , complexometric titration , iminodiacetic acid , titration , sulfate , metal , inorganic chemistry , derivative (finance) , nuclear chemistry , strontium , chelation , organic chemistry , economics , financial economics
A derivative of phenolphtalein, carrying two iminodiacetic acid groups, which enable the substance to bind metal cations, is described. Complex formation with Mg +2 , Ca +2 , Sr +2 , Ba +2 and Zn +2 has been investigated quantitatively and the absorption spectra of the different complexes are given. The new substance, called Phtalein‐Complexone, is an excellent indicator for the complexometric titration of alcaline earth metals. A method for the titration of sulfate is also given.