Determination of arsenic and antimony in seawater by voltammetric and chronopotentiometric stripping using a vibrated gold microwire electrode

Salaün, Pascal; Gibbon-Walsh, Kristopher B.; Alves, Georgina M. S.; Soares, Helena; Berg, Constant M.G. van den

doi:10.1016/j.aca.2012.08.013

Cited by 58 publications

(19 citation statements)

References 60 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Overall, the As hydride technique (see Methods section) is easy to learn, simple to handle, and robust for shipboard measurements. There is also a recently developed electrochemical method (Salaun et al 2012) with sufficiently low detection limits for As 3+ that could be used.…”

Section: Discussionmentioning

confidence: 99%

Arsenic and phosphorus biogeochemistry in the ocean: Arsenic species as proxies for P‐limitation

Wurl

Zimmer

Cutter

2013

Limnology & Oceanography

View full text Add to dashboard Cite

Arsenic and phosphorus are biochemically very similar, and hence arsenate (As 5+ ) is toxic by interfering with the energy metabolism, in particular during P limitation. However, many phytoplankton detoxify As by reducing arsenate to arsenite (As 3+ ), and/or methylating it to mono and dimethyl As. Such As detoxification becomes operative in oligotrophic waters when phosphate concentrations are below those for As; therefore, we evaluated the potential use of these detoxification products as indicators of P limitation by measuring As speciation during the US GEOTRACES North Atlantic transect. The distribution of As 3+ concentrations in surface waters is similar to that of N : P ratios and alkaline phosphatase activity (APA), two conventional proxies for P-limitation. As 3+ concentrations have a very similar relationship to phosphate as APA to phosphate, and therefore indicate the potential of As 3+ as proxy for P-limitation. From the relationship to phosphate we derived threshold values of As 3+ concentration to indicate moderate and extreme P-limitation. We then applied these threshold values to assess P-limitation with high horizontal resolution in the North Atlantic, improving on the contradictory assessments using the conventional proxies. Our new evaluation is consistent with the general concept that the North Atlantic is moderately to extremely limited in phosphate.Arsenic and phosphorus are biochemically very similar, so that phytoplanktonic uptake of arsenate (As 5+ ) induces toxic effects due to its substitution in the adenotriphosphate (ATP) cycle, effectively decoupling the energy metabolism (Lehninger 1975). Many phytoplankton species evolved different strategies to ameliorate the toxic effects of As 5+ , including reduction to arsenite (As 3+ ) and methylation to monomethyl-(MMAs) and dimethylarsenic (DMAs). These detoxification products are less harmful and easier to excrete (Andreae and Klumpp 1979;Sanders and Riedel 1993;Hellweger et al. 2003). Hellweger et al. (2003) proposed a mechanistic model with a limited methylation capacity due to slower kinetics compared with the preceding reduction. Such capacity may be exceeded during luxury P uptake because the chances of taking up As 5+ increase with higher rates of P uptake. Hellweger et al. (2003) proposed that exceeding methylation capacity leads to the excretion of the reduced As 3+ . Surface waters of oligotrophic central gyres have particularly high As : P ratios, with As 5+ concentrations in a range of 10-15 nmol L 21 (Cutter et al. 2001;Cutter and Cutter 2006), while phosphate is typically within a range of 0.2-10 nmol L 21 (Wu et al.

show abstract

Section: Discussionmentioning

confidence: 99%

Arsenic and phosphorus biogeochemistry in the ocean: Arsenic species as proxies for P‐limitation

Wurl

Zimmer

Cutter

2013

Limnology & Oceanography

View full text Add to dashboard Cite

show abstract

“…On AuNPs/GCE, two sharp LSASV peaks were obtained at ca. 0.15 V and 0.85 V, because of the oxidation of preconcentrated As(0) to As(III) and then to As(V) [14][15][16]. On Au-PtNPs/GCE, the two As(0)As(III)As(V) LSASV peaks at ca.…”

Section: Accepted Manuscriptmentioning

confidence: 99%

Anodic stripping voltammetric analysis of trace arsenic(III) enhanced by mild hydrogen-evolution at a bimetallic Au–Pt nanoparticle modified glassy carbon electrode

Liu

Xie

et al. 2015

Electrochemistry Communications

View full text Add to dashboard Cite

“…Microwire electrodes of different sizes (5, 10 or 25 µm) were used for determination of traces of Zn, Cd, Pb, Cu, Hg, As, Sb in various environmental samples [19,[34][35][36][37]. Using VGME with optimized voltammetric procedure (LOD below 0.1 nM), Salaün et al were able to measure As(III) and Sb(III) at nM level in seawater samples [38].…”

Section: Progress Was Achieved In Liverpool Electrochemistry Group Bmentioning

confidence: 99%

Electroanalysis in environmental monitoring: Tracking trace metals—A mini review

Omanović

Garnier

Gibbon-Walsh

et al. 2015

Electrochemistry Communications

View full text Add to dashboard Cite

show abstract

Determination of arsenic and antimony in seawater by voltammetric and chronopotentiometric stripping using a vibrated gold microwire electrode

Cited by 58 publications

References 60 publications

Arsenic and phosphorus biogeochemistry in the ocean: Arsenic species as proxies for P‐limitation

Arsenic and phosphorus biogeochemistry in the ocean: Arsenic species as proxies for P‐limitation

Anodic stripping voltammetric analysis of trace arsenic(III) enhanced by mild hydrogen-evolution at a bimetallic Au–Pt nanoparticle modified glassy carbon electrode

Electroanalysis in environmental monitoring: Tracking trace metals—A mini review

Contact Info

Product

Resources

About