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Pregled bibliografske jedinice broj: 195911

Electrochemical characterisation of Iron(III)-Glycine-Nitrilotriacetate mixed ligand complexes and their stability in aqueous solution


Cuculić, Vlado; Pižeta, Ivanka
Electrochemical characterisation of Iron(III)-Glycine-Nitrilotriacetate mixed ligand complexes and their stability in aqueous solution // Croatica chemica acta, 79 (2006), 1; 41-48 (međunarodna recenzija, članak, znanstveni)


Naslov
Electrochemical characterisation of Iron(III)-Glycine-Nitrilotriacetate mixed ligand complexes and their stability in aqueous solution

Autori
Cuculić, Vlado ; Pižeta, Ivanka

Izvornik
Croatica chemica acta (0011-1643) 79 (2006), 1; 41-48

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
Iron(III); mixed ligand complexes; nitrilotriacetate (NTA); glycine; stability constants; voltammetry; aqueous solution

Sažetak
Electrochemical characterisation of iron(III)-glycine-nitrilotriacetate (iron(III)-Gly-NTA) mixed ligand complexes and determination of their stability constants and retention time in aqueous solution (I = 0.1 mol dm-3 in NaClO4, pH = 8.0+-0.1 at 25+-1 oC) using differential pulse cathodic voltammetry (DPCV), cyclic voltammetry (CV) and direct current (d.c.) polarography with a static mercury drop electrode (SMDE), were performed. Iron(III) concentrations were varied from 5×10-6 to 6×10-4 mol dm-3, NTA total concentrations varied from 2×10-5 to 1×10-3 mol dm-3 and glycine total concentrations were 0.2, 0.02 and 0.002 mol dm-3. Iron(III) redox reaction in the mixed ligand system (with the techniques employed) was found to be the one-electron reversible process. For the total concentration ratios of 1 : 800 : 2 for iron(III), glycine and NTA, respectively, the iron(III)-Gly-NTA mixed ligand complexes are dissolved and stable (>18 hours) in the aqueous solution. The complexes were formed either by the addition of NTA into the iron(III) and glycine aqueous solution or by the addition of iron(III) to the mixture of glycine and NTA. Under these conditions, iron(III) hydrolysis was suppressed to the great extent. By fitting of experimental data following stability constants for mixed ligand complexes, not found in the literature so far, in 0.1 mol dm-3 NaClO4 aqueous solution were calculated: for iron(III) log beta1([FeGlyNTA]-) = 27.23+-0.69, log beta2([Fe(Gly)2NTA]2-) = 30.29+-0.77 ; for iron(II) log beta1([FeGlyNTA]2-) = 14.13+-0.43 and log beta2([Fe(Gly)2NTA]3-) = 18.51+-0.51.

Izvorni jezik
Engleski

Znanstvena područja
Geologija, Kemija



POVEZANOST RADA


Projekt / tema
0098121

Ustanove
Institut "Ruđer Bošković", Zagreb

Časopis indeksira:


  • Current Contents Connect (CCC)
  • Web of Science Core Collection (WoSCC)
    • Science Citation Index Expanded (SCI-EXP)
    • SCI-EXP, SSCI i/ili A&HCI
  • Scopus


Uključenost u ostale bibliografske baze podataka:


  • Chemical Abstracts