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Pregled bibliografske jedinice broj: 210302

Voltammetric determination of stability constants of lead complexes with C-vitamin


Branica, Gina; Metikoš-Huković, Mirjana; Omanović, Dario
Voltammetric determination of stability constants of lead complexes with C-vitamin // Croatica chemica acta, 79 (2006), 1; 77-83 (međunarodna recenzija, članak, znanstveni)


Naslov
Voltammetric determination of stability constants of lead complexes with C-vitamin

Autori
Branica, Gina ; Metikoš-Huković, Mirjana ; Omanović, Dario

Izvornik
Croatica chemica acta (0011-1643) 79 (2006), 1; 77-83

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

Ključne riječi
Lead; L-ascorbic acid; voltammetry; stability constants

Sažetak
Interactions between lead and ascorbic acid were investigated by polarography and voltammetry. Applied techniques were: sampled polarography, differential pulse anodic stripping voltammetry, and square-wave voltammetry. The measurements were performed in perchlorate aqueous solutions under physiological ionic strength (0.15 mol dm^3). The electrochemical redox reaction of Pb(II) is reversible (without adsorption effects or interactions of other lead complexes e.g. hydroxides) under the following conditions: [Pb^2+] = 4x10^-7 mol dm^-3 and pH = 5.5. Ascorbic acid was gradually added from 10^-5 to 10^-1 mol dm^-3. After each increment of ascorbic acid, the signal of lead was recorded by square wave voltammetry. Stability constants were computed by applying a DeFord-Hume non-linear regression function F0 and after have performed a Levenberg-Marquardt fit with the Sigma Plot software. The apparent stability constants were calculated assuming a series of mononuclear complexes (MLn, n = 1, 2...) and yielding the following values for Pb(II)-ascorbate complexes: logβ _1=9.3&plusmn ; ; 0.2 and logβ _2=18.0&plusmn ; ; 0.1.

Izvorni jezik
Engleski

Znanstvena područja
Geologija, Kemija, Temeljne medicinske znanosti



POVEZANOST RADA


Projekt / tema
0022017
0098121
0125011

Ustanove
Institut za medicinska istraživanja i medicinu rada, Zagreb,
Institut "Ruđer Bošković", Zagreb,
Fakultet kemijskog inženjerstva i tehnologije, 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