Application of Polarographic and Voltammetric Techniques in Environmental Analysis

Henze, Günter

doi:10.1007/978-3-642-74206-4_21

Cited by 6 publications

(15 citation statements)

References 24 publications

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“…Where element concentrations are lower, stripping voltammetric methods, anodic stripping voltammetry (ASV) and cathodic stripping voltammetry (CSV) are used. For a determination in the sub-ng g-' range and upper-pg g-' range only, the highest sensitive stripping technique with adsorptive accumulation, adsorptive stripping voltammetry, has to be applied (Henze, 1990). Voltammetric measurements are reproducible and can be repeated without any observable change, they are best calibrated by the standard addition procedure (Seiler, 1988).…”

Section: Electrochemical Methodsmentioning

confidence: 99%

Analytical Techniques for Plant Analysis

Farago

Mehra

1994

Plants and the Chemical Elements

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Section: Electrochemical Methodsmentioning

confidence: 99%

Analytical Techniques for Plant Analysis

Farago

Mehra

1994

Plants and the Chemical Elements

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“…The quantitative characterization of metal complexation with organic ligands is currently largely carried out via the estimation of ambient organic ligand concentrations ([L]) and conditional stability constants (logK ML cond , with M being the metal of interest) of the metal-ligand complex via electrochemical techniques, i.e. voltammetry (Henze 1990;Hirose 2006;Vraspir and Butler 2009). Conditional stability constants reflect the strength of a complex between a metal ion and an organic ligand at a specific temperature, pressure, pH, and ionic strength.…”

Section: Trace Metal Speciation Measurement Techniquesmentioning

confidence: 99%

“…The free and labile metal ion is usually defined as the ionic form of a metal, e.g. Cu 2+ for Cu and Fe 3+ and Fe 2+ for Fe, but can also include all forms of the metal which are reactive or labile and can be detected by a particular analytical method (Henze 1990). Thus, in practice, these forms often also include metals complexed by inorganic ligands (Bruland et al 2014).…”

Section: Voltammetric Techniquesmentioning

confidence: 99%

“…Thus, in practice, these forms often also include metals complexed by inorganic ligands (Bruland et al 2014). For voltammetry, the reactive species of a metal is specifically the fraction that is readily reactive at a working electrode (Henze 1990) usually a mercurybased electrode. The mercury (Hg) electrode was developed and defined by Jaroslav Heyrovsky in the early 1920s (Zuman 2001) and further refined by Matson et al (1965).…”

Section: Voltammetric Techniquesmentioning

confidence: 99%

“…However, due to Hg being a chemical of major health concern, Hg electrodes are currently being progressively replaced with other materials such as carbon or noble metals (gold, silver, platinum) which are often modified with films, nanostructured materials or reagents, to improve the selectivity and/or sensitivity of the analysis (Borrill et al 2019;Worsfold et al 2019c). Voltammetry is a method based on current(redox)potential-response measurements in a three-electrode system-the working electrode, the reference electrode and the counter electrode, which is also known as the auxiliary electrode (Han and Pan 2021;Henze 1990). The registered analytical signal is the change in the current-potential behaviour during a redox reaction of a metal of interest at the stationary working electrode, which itself is immersed into an electro-active solution, e.g.…”

Section: Voltammetric Techniquesmentioning

confidence: 99%

See 2 more Smart Citations

Trace Metals

Middag

Zitoun

Conway

2022

Marine Analytical Chemistry

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In this chapter an overview of sampling and analytical techniques for the marine trace metals (and their stable isotope ratios) is given, focusing largely on the six bio-essential transition metals (iron, manganese, copper, nickel, zinc and cobalt). The aim of this chapter is to introduce the reader to the breadth of techniques and methods currently available to study the biogeochemical cycles of trace metals and their isotopes in the ocean. We note that we do not cover all existing and historical techniques as some are no longer used, some remain immature for trace metal studies, and some are just emerging or are still being developed. A more detailed focus on the methods used by the authors is also provided. We anticipate the continuing development and refinement of methods; as with any expanding and developing scientific field, novel strategies and techniques continuously come and go. For further background reading on marine trace metal distribution and key biogeochemical processes in the ocean, the reader is referred throughout the chapter to appropriate overviews, articles and textbooks available online, including the freely available GEOTRACES electronic atlas and data products, as well as the GEOTRACES 'cookbook'. Keywords:Marine trace metal biogeochemistry • Marine trace metal sampling • Marine trace metal sample handling • Marine trace metal analysis • Marine metal stable isotope analysis • Marine trace metal speciation analysis 3.1

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Investigating the fate of copper in a laboratory‐based toxicity test with embryos of Mytilus galloprovincialis: Copper mass balance of a closed bioassay

Zitoun

Hassler²,

Clearwater

et al. 2019

Enviro Toxic and Chemistry

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The production of accurate and reliable data on metal toxicity during ecotoxicological bioassays is important for credible environmental risk assessments and management in aquatic environments. Actual measurements and reporting of contaminant concentrations in bioassays are, however, often disregarded; and potential contaminant loss attributable to adsorption processes (e.g., wall adsorption) in bioassays is widely omitted, which can have detrimental effects on calculated metal toxicity thresholds. In the present we assessed copper (Cu) mass balance during a standard 48‐h bioassay test with blue mussel (Mytilus galloprovincialis) embryos to evaluate effects on calculated toxicity endpoints. We demonstrated that measured Cu concentrations at the test conclusion need to be used to quantify the risk of Cu toxicity because nominal Cu and initial Cu concentrations underestimate overall Cu toxicity by up to 1.5‐fold, owing to Cu loss in solution attributable to adsorption and bioaccumulation processes. For the first time we provide evidence that extracellular adsorption to the biological surface of the embryos is the most important sink for total dissolved Cu in a bioassay. We also established that adsorbed extracellular Cu accumulation reduces Cu toxicity to embryos, potentially by inhibiting Cu from entering the cell of the mussel embryo. Environmental factors (e.g., salinity and dissolved organic carbon) did not influence the partitioning of Cu within the laboratory‐based bioassay. The present results 1) demonstrate the importance of differentiating extra‐ and intracellular Cu pools to improve our understanding of Cu toxicity and associated processes, 2) reveal the potential for bias with respect to calculated Cu toxicity thresholds when results are based on nominal and initial Cu concentrations, and 3) point out the need to follow current guidelines for the testing of chemicals to standardize toxicity tests and data reporting. Environ Toxicol Chem 2019;38:561–574. © 2019 SETAC

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Application of Polarographic and Voltammetric Techniques in Environmental Analysis

Cited by 6 publications

References 24 publications

Analytical Techniques for Plant Analysis

Analytical Techniques for Plant Analysis

Trace Metals

Investigating the fate of copper in a laboratory‐based toxicity test with embryos of Mytilus galloprovincialis: Copper mass balance of a closed bioassay

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