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Pregled bibliografske jedinice broj: 589416

Revision of iron(III)-citrate speciation in aqueous solution. Voltammetric and spectrophotometric studies


Vukosav, Petra; Mlakar Marina; Tomišić, Vladislav
Revision of iron(III)-citrate speciation in aqueous solution. Voltammetric and spectrophotometric studies // Analytica chimica acta, 745 (2012), 1; 85-91 doi:10.1016/j.aca.2012.07.036 (međunarodna recenzija, članak, znanstveni)


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Naslov
Revision of iron(III)-citrate speciation in aqueous solution. Voltammetric and spectrophotometric studies

Autori
Vukosav, Petra ; Mlakar Marina ; Tomišić, Vladislav

Izvornik
Analytica chimica acta (0003-2670) 745 (2012), 1; 85-91

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

Ključne riječi
iron(III); citric acid; voltammogram; iron(III)-citrate complexes; UV-Vis spectra; stability constants

Sažetak
A detailed study of iron(III)-citrate speciation in aqueous solution (θ = 25 °C, Ic = 0.7 mol L-1) was carried out by voltammetric and UV-Vis spectrophotometric measurements and the obtained data were used for reconciled characterization of iron(III)-citrate complexes. Four different redox processes were registered in the voltammograms: at 0.1 V (pH = 5.5) which corresponded to the reduction of iron(III)-monocitrate species (Fe:cit = 1:1), at about -0.1 V (pH = 5.5) that was related to the reduction of (FeL2)5-, (FeL2H)4- and (FeL2H2)3- complexes, at -0.28 V (pH = 5.5) which corresponded to the reduction of polynuclear iron(III)-citrate complex(es), and at -0.4 V (pH = 7.5) which was probably a consequence of Fe(cit)2(OH)x species reduction. Reversible redox process at -0.1 V allowed for the determination of iron(III)-citrate species and their stability constants by analyzing Ep vs. pH and Ep vs. [L4-] dependence. The UV-Vis spectra recorded at varied pH revealed four different spectrally active species: FeLH (log β = 25.69), (FeL2H2)3- (log β = 48.06), (FeL2H)4- (log β = 44.60), and (FeL2)5- (log β = 38.85). The stability constants obtained by spectrophotometry were in agreement with those determined electrochemically. The UV-Vis spectra recorded at various citrate concentrations (pH = 2.0) supported the results of spectrophotometric- potentiometric titration.

Izvorni jezik
Engleski

Znanstvena područja
Geologija, Kemija



POVEZANOST RADA


Projekt / tema
098-0982934-2720 - MEĐUDJELOVANJA OBLIKA TRAGOVA METALA U VODENOM OKOLIŠU (Ivanka Pižeta, )
119-1191342-2960 - Elektroliti i koordinacijske reakcije u otopini (Vladislav Tomišić, )

Ustanove
Institut "Ruđer Bošković", Zagreb,
Prirodoslovno-matematički fakultet, Zagreb

Profili:

Avatar Url Marina Mlakar (autor)

Avatar Url Petra Vukosav (autor)

Avatar Url Vladislav Tomišić (autor)

Citiraj ovu publikaciju

Vukosav, Petra; Mlakar Marina; Tomišić, Vladislav
Revision of iron(III)-citrate speciation in aqueous solution. Voltammetric and spectrophotometric studies // Analytica chimica acta, 745 (2012), 1; 85-91 doi:10.1016/j.aca.2012.07.036 (međunarodna recenzija, članak, znanstveni)
Vukosav, P., Mlakar Marina & Tomišić, V. (2012) Revision of iron(III)-citrate speciation in aqueous solution. Voltammetric and spectrophotometric studies. Analytica chimica acta, 745 (1), 85-91 doi:10.1016/j.aca.2012.07.036.
@article{article, year = {2012}, pages = {85-91}, DOI = {10.1016/j.aca.2012.07.036}, keywords = {iron(III), citric acid, voltammogram, iron(III)-citrate complexes, UV-Vis spectra, stability constants}, journal = {Analytica chimica acta}, doi = {10.1016/j.aca.2012.07.036}, volume = {745}, number = {1}, issn = {0003-2670}, title = {Revision of iron(III)-citrate speciation in aqueous solution. Voltammetric and spectrophotometric studies}, keyword = {iron(III), citric acid, voltammogram, iron(III)-citrate complexes, UV-Vis spectra, stability constants} }

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


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