Pregled bibliografske jedinice broj: 1048096
Electrochemical Characterization of Cobalt(II)-Complexes Involved in Marine Biogeochemical Processes. I. Co(II)-4-Nitrocatechol and Co(II)-Humate
Electrochemical Characterization of Cobalt(II)-Complexes Involved in Marine Biogeochemical Processes. I. Co(II)-4-Nitrocatechol and Co(II)-Humate // Electrochimica acta, 337 (2020), 135797, 7 doi:10.1016/j.electacta.2020.135797 (međunarodna recenzija, članak, znanstveni)
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Naslov
Electrochemical Characterization of Cobalt(II)-Complexes Involved in Marine Biogeochemical Processes. I. Co(II)-4-Nitrocatechol and Co(II)-Humate
Autori
Bačinić, Anđela ; Tumir, Lidija-Marija ; Mlakar, Marina
Izvornik
Electrochimica acta (0013-4686) 337
(2020);
135797, 7
Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni
Ključne riječi
cobalt(ii) ; 4-nitrocatechol ; humic acid ; voltammetry ; speciation
Sažetak
Cobalt (II) as an important micronutrient for numerous biological processes in marine environment, has been tested in model aqueous solutions with naturally occurring ligands 4-nitrocatecol (4NC) and humic acid (HA) by voltammetry and spectrophotometry. Irreversible, two-electron reduction processes of Co(II)–4NC and Co(II)-HA complexes adsorbed on the mercury drop surface, depending on accumulation time and composition of the solution (cCo, c4NC, cHA and pH), were detected. Complexes Co:L = 1:1 stability constants formed only in the solution, were determined by spectrophotometry and amout to log KCo(II)4NC = 3.98 (pH = 8.2) and log KCo(II)4NC = 5.76 (pH = 6.5), and log KCo(II)HA = 3.80 (pH = 8.2). Co:L = 1:2 complexes Co(II)-(4NC)2 at pH 6.5 and 8.2 and Co(II)-(HA)2 at pH 8.2, formed at the mercury drop electrode surface as hydrophobic specia, were detected only by voltammetric measurements. Conditional stability constants were calculated by the CLE/ACSV method: log KCo(II) (4NC)2 = 21.86 (pH = 8.2), log KCo(II) (4NC)2 = 21.11 (pH = 6.5) and log KCo(II) (HA)2 = 11.32 (pH = 8.2).
Izvorni jezik
Engleski
Znanstvena područja
Interdisciplinarne prirodne znanosti
POVEZANOST RADA
Projekti:
HRZZ-IP-2014-09-7530 - Novi metodološki pristup biogeokemijskim istraživanjima specijacije metala u tragovima u obalnim vodenim ekosustavima (MEBTRACE) (Omanović, Dario, HRZZ - 2014-09) ( CroRIS)
Ustanove:
Institut "Ruđer Bošković", Zagreb
Poveznice na cjeloviti tekst rada:
Pristup cjelovitom tekstu rada doi www.sciencedirect.com fulir.irb.hrCitiraj ovu publikaciju:
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
