Zinc speciation is considered to be an important determinant of the biological availability of zinc. Yet in oceanic surface waters, characterization of zinc speciation is difficult due to the low concentrations of this essential micronutrient. In this study, an anodic stripping voltammetry method previously developed for the total determination of cadmium and lead was successfully adapted to the measurement of zinc speciation. The method differs from previous zinc speciation anodic stripping voltammetry methods in that a fresh mercury film is plated with each sample aliquot. The fresh film anodic stripping voltammetry method was compared to competitive ligand exchange cathodic stripping voltammetry in a profile from the North Atlantic Ocean. Results using the fresh film anodic stripping voltammetry method were similar to those determined using the cathodic stripping voltammetry method, though ligand concentrations determined by fresh film anodic stripping voltammetry were generally slightly higher than those determined by cathodic stripping voltammetry. There did not seem to be a systematic difference between methods for the estimates of conditional stability constants. The ligand concentration in the North Atlantic profile ranged from 0.9 to 1.5 nmol L(-1) as determined by fresh film anodic stripping voltammetry and 0.6 to 1.3 nmol L(-1) as determined by cathodic stripping voltammetry. The conditional stability constants determined by fresh film anodic stripping voltammetry were 10(9.8)-10(10.5) and by cathodic stripping voltammetry were 10(9.8)-10(11.3).
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1016/j.aca.2008.03.006 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
rGO/HfO nanocomposite-enabled electrochemical sensor for high-performance pesticide detection.
Talanta
January 2025
Department of Chemical and Biomolecular Engineering, University of Connecticut, CT, 06269, United States. Electronic address:
This study applies a periodic table-guided approach to select and investigate hafnium oxide (HfO), in conjunction with reduced graphene oxide (rGO), for the electrochemical determination of methyl parathion (MP), an organophosphate insecticide. MP poses significant ecological and health risks due to its high toxicity, and despite bans, illegal use has been reported, especially in the global south. To address these challenges, an electrode modified with a nanocomposite of rGO/HfO was first constructed for MP detection.
View Article and Find Full Text PDFEnhanced simultaneous voltammetric detection of lead, copper, and mercury using a MIL-101(Cr)-(COOH)@MWCNTs modified glassy carbon electrode.
Anal Chim Acta
February 2025
Chemistry Department, Faculty of Science, Ain-Shams University, Cairo, 11566, Egypt; Department of Chemistry, Faculty of Science, Galala University, New Galala City, Suez, Egypt. Electronic address:
Background: Electrochemical methods, particularly those utilizing sensors, offer distinct advantages over classical analytical methods. They are cost-effective, compatible with mass fabrication, suitable for remote sensing, and can be designed as handheld analyzers. In this context, MIL-101(Cr)-(COOH)₂@MWCNTs was utilized for the first time as a modifier for GCE for the sensitive voltammetric detection of Pb(II), Cu(II), and Hg(II).
View Article and Find Full Text PDFOptimizing the Construction and Activation of 3D-Printed Electrochemical Sensors: An Experimental Design Approach for Simultaneous Electroanalysis of Paracetamol and Caffeine.
ACS Omega
January 2025
Laboratory of Carbon and Ceramic Materials (LMC), Department of Physics, Center of Exact Sciences, Federal University of Espírito Santo, Vitória 29075-910, Espírito Santo, Brazil.
This work presents an optimization of the construction, treatment, and activation of 3D-printed electrochemical sensors (E-3D). For this, was used a 2-full factorial design examining three key variables at two levels: electrode height, electrode diameter, and printing speed. Moreover, it evaluates various physical, chemical, and electrochemical methods to treat and activate the E-3D surface.
View Article and Find Full Text PDFQuantifying of thallium in Shilajit and its supplements to unveil the potential risk of consumption of this popular traditional medicine.
BMC Chem
January 2025
Department of Chemistry, Faculty of Sciences, University of Sistan and Baluchestan, Zahedan, 98135-674, Iran.
Shilajit, a natural substance used in traditional and modern medicine, has gained prominence as a vital component in dietary supplements. Concerns regarding its use in complementary medicine have arisen due to limited information regarding its composition. Considering thallium's well-known toxicity, this study employs flow - injection differential-pulse anodic stripping voltammetry to accurately quantify thallium in natural Shilajit and Shilajit-based commercial supplements from various regions.
View Article and Find Full Text PDFSimultaneous quantification of Hg(II) and Pb(II) by square wave anodic stripping voltammetry using Bi/graphite electrode.
Heliyon
July 2024
Engineering Faculty, Department of Environmental and Chemical Engineering, Universidad Nacional de Colombia, Colombia.
In the present work, we report the synthesis and evaluation of a graphite-supported bismuth film working electrode (BiFE) in the simultaneous quantification of Hg(II) and Pb(II) at ppb levels. The BiFE was synthesized in-situ by electrodeposition in 1 M HNO as the supporting electrolyte at -0.5 V potential.
View Article and Find Full Text PDFWant AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!