9966. Versenol (Dow)

Nomenclature

CAS number: 139-89-9
N-[2-[Bis(carboxymethyl)amino]ethyl]-N-(2-hydroxyethyl)glycine trisodium salt; N-(carboxymethyl)-N′-(2-hydroxyethyl)-N,N′-ethylenediglycine trisodium salt; N-hydroxyethylethylenediaminetriacetic acid trisodium salt; trisodium N-hydroxyethylethylenediaminetriacetate; HEDTA.
C10H15N2Na3O7; mol wt 344.20.
C 34.89%, H 4.39%, N 8.14%, Na 20.04%, O 32.54%.

Description and references

Prepn: Young, US 2811550 (1957 to Refined Prod.); Kroll, Dexter, US 2845457 (1958 to Geigy).

Chemical structure

Use

As chelating agent for trivalent iron from pH 7 to pH 10. Forms strong 1:1 ferric chelates. The iron chelates formed will then chelate other heavy metal or alkaline earth ions.