Abstract
SINCE the publication by Schwarzenbach et al.1 of the relatively high degree of calcium binding by N-methylene-phosphonic-imino-diacetic acid, it seems that the phosphonate group may be quite as effective as the carboxylate group in chelating agents. An attempt to prepare ethylene-diamine-tetra-methylene-phosphonic acid (EDPA) was therefore indicated because of its similarity to ethylene-diamine-tetra-acetic acid (EDTA). Although the preparation of this and similar compounds has been reported by Bersworth2, the present communication gives quantitative information of the affinity of the ethylene-diamine-tetra-methylene-phosphonic acid anion for hydrogen ions and metal ions.
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