Complexation of [S,S] and mixed stereoisomers of N,N′-ethylenediaminedisuccinic acid (EDDS) with Fe(iii), Cu(ii), Zn(ii) and Mn(ii) ions in aqueous solution

Chelating Agents of a New Generation as an Alternative to Conventional Chelators for Heavy Metal Ions Removal from Different Waste Waters

“…The obtained complexes are mostly not biodegradable (Loonen, et al 1999;Vandevivere, et al 2001). For example, Pb(II) and Zn(II) complexes with EDDS (Kos & Lěstan, 2003;Neal & Roshe, 1973) have practically the same stability constants but the Pb(II)-EDDS complex is much more readily biodegradable than Zn(II) one (Orama, et al 2002). For M(II) complexes with EDDS the stability constants are presented in Table 3 (Vandevivere, et al 2001) and compared to IDS, DS, GLDA and MGDA.…”

Effect of Extraction Variables on the Biodegradable Chelant-Assisted Removal of Toxic Metals from Artificially Contaminated European Reference Soils

“…A chelant is considered suitable for practical use having the logK′ ML > 6 (Orama et al 2002) and, accordingly, the biodegradable chelants are unsuitable for the separation of the target metals other than Cu at the pH < 5. Therefore, the metal extraction performance perceived at pH 4 for EDDS, GLDA, HIDS cannot be associated with the stability of ML complexes (M = Cd 2+ , Pb 2+ , Zn 2+ ) in solution (Fig.…”

A voltammetric study on the speciation and stability constants for iminodisuccinic acid with selected transition metal ions

“…In the case of Cu 2 þ and Pb 2 þ , similar effective application ranges are found if H 4 EDDS is the chelant, while for the remaining metals H 4 EDDS has a larger effective range, usually commencing at 2 pH units lower than analogous H 4 IDS -metal complexes (Orama et al, 2002). However, the effective range of H 4 IDS with the metal ions studied here do indicate that H 4 IDS is suitable for application in many industrial processes, even if it is not as efficient a chelator as are H 4 EDDS, H 4 EDTA and H 5 DTPA.…”