Hydroxyethylethylenediaminetriacetic acid HEDTA

Wood and Higginson " have made a detailed study of the kinetics of oxidation of Fe(ll) by a number of complexes of Co(IIl) with ethylenediaminetetraacetic acid (H4Y = EDTA) and hydroxyethylethylenediaminetriacetic acid (H3YOH = HEDTA). Rate data and activation parameters are quoted (Table 21) for the... 

N-Hydroxyethyl-1,2-ethanediamine. See Aminoethylethanolamine Hydroxyethyl ether cellulose. See Hydroxyethylcellulose N-(2-Hydroxyethyl)-N-ethylaniline. See Phenylethylethanolamine Hydroxyethyl ethylcellulose (INCI). See Ethyl hydroxyethyl cellulose Hydroxyethylethylenediamine N-(2-Hydroxyethyl) ethylenediamine N-(P-Hydroxyethyl) ethylenediamine. See Aminoethylethanolamine Hydroxyethyl ethylenediamine triacetic acid N-(2-Hydroxyethyl) ethylenediamine triacetic acid N-(P-Hydroxyethylethylenediamine)-N,N, N -triacetic acid. See HEDTA Hydroxyethylethylenediaminetriacetic acid, trisodium salt. See Trisodium HEDTA (N-Hydroxyethylethylenedinitrilo) triacetic acid. See HEDTA... 

The electrochemical properties of the W /V -NTA (nitrilotriacetic acid) system have been studied [1]. From the Ei/j value and Nernst equation, Meier et al. evaluated the formation constant for V(II)NTA(H20). Kato et al. [2] studied the polarographic behaviour of V(III)-HEDTA (N-hydroxyethylethylenediaminetriacetic acid). They proposed the electrode mechanisms for V(III)-HEDTA and calculated the equilibrium constants by a curve fitting method. Jung et al. [3] studied reduction mechanism of VO" -DTPA (diethylenetrlaminepentaacetlc acid) at a mercury electrode in aqueous solution. They proposed that reduction reactions of the VO " -DTPA system occurred through an ECE reaction sequence. 

HsiHEDTA), hydroxyethylethylenediaminetriacetic acid, and the lighter Ln(HEDTA) chelate species are more soluble in water than H4(EDTA) and the HLa(EDTA)-7H20, HLa(EDTA) H20, HCe(EDTA) H20 and HPr(EDTA) H20 species. This permits ammonium HEDTA to be used as the eluant with H -ion retaining beds at all temperatures and greatly simplifies reagent recovery. Even the effluent water can be reused. Table 22.6 lists the separation factors available with HEDTA at 92°C, as well as at 25°C. 

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