Intercomparison of voltammetric techniques to determine the chemical speciation of dissolved copper in a coastal seawater sample

Bruland, Kenneth W.; Rue, Eden L.; Donat, John R.; Skrabal, Stephen A.; Moffett, James W.

doi:10.1016/s0003-2670(99)00675-3

Cited by 153 publications

(172 citation statements)

References 39 publications

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“…The influence of analytical window on speciation results has long been established for copper speciation analyses (Bruland et al, 2000;Buck and Bruland, 2005), where higher analytical windows measure lower concentrations of stronger (i.e., higher conditional stability constant) ligands than lower analytical windows (Bruland et al, 2000). In the Fe speciation measurements at BATS, however, comparable concentrations of the strongest ligand class were determined by both analytical windows while an additional weaker ligand class was determined in the lower analytical window.…”

Section: Sa Tac Suwannee River Fulvic Acid-type Dfe-binding Ligandsmentioning

confidence: 99%

An Intercomparison of Dissolved Iron Speciation at the Bermuda Atlantic Time-series Study (BATS) Site: Results from GEOTRACES Crossover Station A

2016

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Section: Sa Tac Suwannee River Fulvic Acid-type Dfe-binding Ligandsmentioning

confidence: 99%

An Intercomparison of Dissolved Iron Speciation at the Bermuda Atlantic Time-series Study (BATS) Site: Results from GEOTRACES Crossover Station A

2016

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“…Great strides have been made in the last two decades in appreciating trace metal complexation, particularly through the application of the techniques of anodic stripping voltammetry (ASV) [1] and competitive ligand exchange, including cathodic stripping voltammetry [2,3]. Yet, as understanding has advanced and the true complexity of the distribution of ligand binding strengths has been recognized, our ability to quantify fully the chemistry of natural waters has apparently receded [4].…”

Section: Introductionmentioning

confidence: 99%

In situ speciation measurements. Using diffusive gradients in thin films (DGT) to determine inorganically and organically complexed metals

Zhang

Davison

2001

Pure and Applied Chemistry

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The possibilities of using diffusive gradients in thin films (DGT) and anodic stripping voltammetry (ASV) to perform speciation measurements in natural waters are discussed. Both techniques measure labile species, but different approaches have been used to discriminate organic (C org ) and inorganic (C inorg ) metal complexes. In DGT, metals are bound to a resin after passing through a hydrogel that serves as a well-defined diffusion layer. DGT devices with different hydrogels that impede the diffusion of humic substances by different amounts were deployed in solutions of copper and humic substances. Devices with a gel composition that greatly restricted the diffusion of humic substances, but only retarded the diffusion of Cu ions slightly, could be used directly to determine C inorg . By using different, more open pored gels, which allowed some passage of humic substances, it was possible to determine both C org and C inorg . The two separate measurements of C inorg obtained using the two DGT approaches agreed well. At the high concentrations of Cu used there was good agreement with the predicted distribution from the speciation code WHAM. At the lowest Cu concentration, the proportion of C inorg estimated using DGT was higher than with WHAM. Possibilities of errors in the DGT or modeling approaches are discussed.

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“…[2,4,9] However, for a greater understanding of the behavior and the interactions of trace metals with other constituents (including biota), specific techniques were developed and widely applied, providing valuable information on the trace metal speciation. [6,[10][11][12][13][14][15][16][17] Bioavailability of trace metals is of primary concern when considering if trace metals serve as nutrients or as toxicants. [10,11,18] According to European Water Framework Directive [19] some trace metals (Cd, Pb, Hg and Ni) are considered as of priority concern and measurement of their bioavailability is suggested either indirectly by modeling of their speciation or directly by utilizing specific measurement methodology.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of Discrete and Passive Sampling (Diffusive Gradients in Thin-films – DGT) Approach for the Assessment of Trace Metal Dynamics in Marine Waters – a Case Study in a Small Harbor

Cindrić¹,

Cukrov²,

Durrieu³

et al. 2017

Croat. Chem. Acta

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Two complementary approaches, based on discrete and passive samplings (diffusive gradients in thin-films -DGT), supported by the speciation modeling, were evaluated for the assessment of distribution and operational speciation of trace metals (Zn, Cd, Pb, Cu, Ni and Co) within a small marine harbor (Rijeka, Croatia). Concentrations of dissolved metals were relatively low and comparable to, or slightly above those found in coastal Adriatic region. Compared to higher variability of dissolved metal concentrations due to the discrete sampling, smoother temporal distribution was recorded for DGT-labile metals. The percentages of DGT-labile metal concentrations, which reflect their affinity to organic matter, varied among metals with the following order: Cu < Zn ≈ Co < Ni < Cd ≈ Pb. DGT-labile metal concentrations predicted by speciation modeling were in a good agreement with the measured ones for Zn, Cd and Ni, while they are underestimated for Pb and Cu, and overestimated for Co. In-situ DGT technique is recommended for the assessment of the water quality status in marine environment.

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Intercomparison of voltammetric techniques to determine the chemical speciation of dissolved copper in a coastal seawater sample

Cited by 153 publications

References 39 publications

An Intercomparison of Dissolved Iron Speciation at the Bermuda Atlantic Time-series Study (BATS) Site: Results from GEOTRACES Crossover Station A

An Intercomparison of Dissolved Iron Speciation at the Bermuda Atlantic Time-series Study (BATS) Site: Results from GEOTRACES Crossover Station A

In situ speciation measurements. Using diffusive gradients in thin films (DGT) to determine inorganically and organically complexed metals

Evaluation of Discrete and Passive Sampling (Diffusive Gradients in Thin-films – DGT) Approach for the Assessment of Trace Metal Dynamics in Marine Waters – a Case Study in a Small Harbor

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