Repozitorij istraživačkih podataka Instituta Ruđer Bošković
| Naslov (engleski) | Voltammetric study of bathocuproine disulphonate/copper system |
| Autor | Elvira Bura Nakić Institut Ruđer Bošković |
| Autor | Dora Crmarić Ruđer Bošković Institute |
| Autor | Nuša Cukrov Ruđer Bošković Institute |
| Autor | Marina Mlakar Ruđer Bošković Institute |
| Znanstveno / umjetničko područje, polje i grana | PRIRODNE ZNANOSTI Interdisciplinarne prirodne znanosti Znanost o moru |
| Sažetak (engleski) | The cathodic stripping voltammetry of copper in the presence of a Cu(I) ligand probe (bathocuproine disulfonate - BCS) is investigated. The Cu(I)-BCS and Cu(II)-BCS complexes formed are reduced, at approximately -0.55 V and -0.90 V against Ag/AgCl, respectively. The reduction of Cu(I)-BCS is accompanied by disproportionation to Cu(0) and Cu(II) and Cu(II)-BCS reduction to Cu(0) at potentials of about -0.55 V and -0.90 V vs. Ag/AgCl, respectively. The reduction mechanism of both complexes was recognized as an irreversible redox reaction followed by a chemical dissociation reaction (EC mechanism). The BCS ligand shows strong adsorption on the mercury drop electrode and is a selective ligand for Cu(I) ions, especially when EDTA is added to the solution. By extending the applied accumulation time, adsorptive cathodic stripping voltammetry offers the possibility to study Cu(I) and Cu(II) redox speciation in the nmol concentration range in the environment and in biological matrices. |
| Metodologija (engleski) | The three-electrode setup was used for measurements using alternating current voltammetry (ACV), cyclic voltammetry (CV), differential pulise anodic stripping voltammetry (DP-ASV) and square-wave voltammetry (SWV). The reference electrode was Ag/AgCl (3 mol dm-3 KCl), the counter electrode was Pt and the working electrode was hanging mercury drop electrode (HMDE). The capacitive current of the double layer formed between an HMDE and electrolyte (aqueous 0.55 mol dm-3 NaCl + 0.01 mol dm-3 borate buffer) solution containing 0.66 µmol dm-3 BCS were recorded by means of phase-sensitive alternating current voltammetry (ACV) using µ-Autolab (Electrochemical Instruments Eco Chemie, The Netherlands) connected to a 663 Stand Metrohm mercury electrode (electrode surface, A=1.68 x 10-3 cm2). All other parameters used during ACV and SWV measurements (e.g. deposition potential and time, scan rate, etc.) are given in Figures description in the main manuscript and Supplementary information. All measurements using described three-electrode set up were done under the N2 atmosphere. The Cu(I) stock solution was prepared daily by dissolving CuCl in N2 degassed MQ water containing high concentrations of HCl and NaCl (0.1 and 1 mol dm-3, respectively). The Cu(II) standard solution was prepared by dissolving copper(II)-sulfate (CuSO4; VWR BDH Prolabo Chemicals, Radnor, PA, USA) in MQ water. All supporting electrolyte solutions (0.55 mol dm-3 NaClO4 or 0.55 mol dm-3 NaCl) were buffered at pH of ~8.2 by borate buffer with the final concentration of 0.01 mol dm-3. Bathocuproine sulfonate disodium salt (BCS) was purchased from Thermo Scientific (purum >97%). Cu(I)Cl salt was supplied from the Alfa Aesar (purum >97%), ortho-Boric acid from VWR, NaOH from LACH NER, NaCl and HCl were supplied from Merck. Total dissolved Cu concentration in Krka River estuary sample was measured by DP-ASV using the standard addition method. The sample was filtered (0.45 µm pore size, Sartorius) and acidified HNO3 s.p. to pH < 2 preceding UV digestion for at least 24 hours prior measurements. Each standard addition measurement was performed twice. The voltammograms were processed using the ECDSOFT (ElectroChemical Data SOFTware) software developed in our laboratory (https://sites.google.com/site/daromasoft/home/ecdsoft). The peak height was used as the signal value. |
| Ključne riječi (engleski) | |
| Jezik | engleski |
| URN:NBN | urn:nbn:hr:241:606810 |
| Datum objave | 2023-05-30 |
| Geolokacija | Martinska, Hrvatska |
| Projekt | Šifra: IPCH-2020-10-4965 Naziv (hrvatski): Razumijevanje pojavnosti kemijskih vrsta bakra i redoks transformacija u morskoj vodi Naziv (engleski): Understanding copper speciation and redox transformations in seawater Kratica: SeCuTrans Voditelj: Elvira Bura-Nakić Pravna nadležnost: Hrvatska Financijer: Hrvatska zaklada za znanost |
| Vanjski povezani objekt | Nadopuna od: URL https://fulir.irb.hr/9082/ |
| Izdavač | Institut Ruđer Bošković Ruđer Bošković Institute |
| Prava pristupa | Otvoreni pristup |
| Uvjeti korištenja |  |
| Datum i vrijeme pohrane | 2025-03-18 12:24:06 |
