Comparison of Analytical Techniques for Dynamic Trace Metal Speciation in Natural Freshwaters

Sigg, Laura; Black, Frank; Buffle, Jacques; Cao, Jun; Cleven, R.F.M.J.; Davison, William; Galceran, Josep; Gunkel, Peggy; Kalis, E.J.J.; Kistler, David; Martin, Michel; Noël, Stéphane; Nur, Yusuf; Odžak, Nikša; Puy, Jaume; Riemsdijk, Willem van; Temminghoff, E.J.M.; Tercier‐Waeber, Mary‐Lou; Toepperwien, Stefanie; Town, Raewyn M.; Unsworth, Emily R.; Warnken, Kent W.; Weng, Liping; Xue, Hanbin; Zhang, Hao

doi:10.1021/es051245k

Cited by 181 publications

(155 citation statements)

References 34 publications

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“…Fe and Mn) during the dry mid-autumn season, the average DGT-labile concentrations of nine analyzed metals in the surface water of the selected section of the Sava River were comparable to the concentrations previously reported for the rivers regarded as unpolluted (e.g. river Wyre, Sigg et al 2006;Dragun et al 2008). …”

Section: Labile Metal Concentrations In the Sava River Water Measuredsupporting

confidence: 83%

Metal Bioavailability in the Sava River Water

Dragun

Marijić

Vuković³

et al. 2014

The Handbook of Environmental Chemistry

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Metals present one of the major contamination problems for freshwater systems, such as the Sava River, due to their high toxicity, persistence, and tendency to accumulate in sediment and living organisms. The comprehensive assessment of the metal bioavailability in the Sava River encompassed the analyses of dissolved and DGT-labile metal species of nine metals (Cd, Co, Cr, Cu, Fe, Mn, Ni, Pb, and Zn) in the river water, as well as evaluation of accumulation of five metals (Cd, Cu, Fe, Mn, and Zn) in three organs (liver, gills and gastrointestinal tissue) of bioindicator organism, fish species European chub (Squalius cephalus L.). This survey was conducted mainly during the year 2006, in two sampling campaigns, in April/May and September, as periods representative for chub spawning and postspawning. Additionally, metal concentrations were determined in the intestinal parasites acanthocephalans, which are known for their high affinity for metal accumulation. Metallothionein concentrations were also determined in three chub organs, as a commonly applied biomarker of metal exposure. Based on the metal concentrations in the river water, the Sava River was defined as weakly contaminated and mainly comparable with unpolluted rivers, which enabled the analyses of physiological variability of metal and metallothionein concentrations in the chub organs, as well as establishment of their constitutive levels.

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Section: Labile Metal Concentrations In the Sava River Water Measuredsupporting

confidence: 83%

Metal Bioavailability in the Sava River Water

Dragun

Marijić

Vuković³

et al. 2014

The Handbook of Environmental Chemistry

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“…As noted above, there may theoretical reasons for this. [47] A way forward would be a concerted effort to compare techniques, building on previous work and ideas, [13,[53][54][55] but covering a wider and more representative range of conditions and metals.…”

Section: Future Researchmentioning

confidence: 99%

Metal speciation from stream to open ocean: modelling v. measurement

Tipping¹,

Lofts²,

Stockdale³

2016

Environ. Chem.

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Environmental context. The chemical speciation of metals strongly influences their transport, fate and bioavailability in natural waters. Analytical measurement and modelling both play important roles in understanding speciation, while modelling is also needed for prediction. Here, we analyse a large set of data for fresh waters, estuarine and coastal waters, and open ocean water, to examine how well measurements and modelling predictions agree.Abstract. We compiled a data set of ,2000 published metal speciation measurements made on samples of fresh waters, estuarine and coastal waters, and open ocean waters. For each sample, we applied the chemical speciation model WHAM7 to calculate the equilibrium free metal ion concentrations, [M] (mol L À1 ), amounts of metal bound by dissolved organic matter (DOM), n (mol g À1 ), and their ratio n/[M] (L g À1 ), which is a kind of 'local' partition coefficient. Comparison of the measured and predicted speciation variables for the whole data set showed that agreements are best for fresh waters,

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“…Thus, equilibration times of about 12 h or below, as often found in experiments of CLE-AdCSV, are completely inadequate for Ni with K ML ∼ 10 12 , and an overestimated stability constant will be found from CLE-AdCSV measurements compared to real values. For equilibration times of about 12 h, the stability constant K ML of Ni should be lower than 10 9 .…”

Section: Stripping Chronopotentiometry (Scp)mentioning

confidence: 99%

“…1,8 The species measured are those that are both mobile and labile for the given technique, and will include free metal ions and labile complexes in the size range up to a few hundreds of nanometers. 9 Due to the importance of the dynamic considerations in the interpretation of the electrochemical signal, the development of the kinetic features in the interconversion of metal complex species will be reviewed in the next paragraphs.…”

Section: Dynamic Speciation By Electrochemicalmentioning

confidence: 99%

Electrochemical Methods for Speciation of Trace Elements in Marine Waters. Dynamic Aspects

2012

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The contribution of electrochemical methods to the knowledge of dynamic speciation of toxic trace elements in marine waters is critically reviewed. Due to the importance of dynamic considerations in the interpretation of the electrochemical signal, the principles and recent developments of kinetic features in the interconversion of metal complex species will be presented. As dynamic electrochemical methods, only stripping techniques (anodic stripping voltammetry and stripping chronopotentiometry) will be used because they are the most important for the determination of trace elements. Competitive ligand exchange-adsorptive cathodic stripping voltammetry, which should be considered an equilibrium technique rather than a dynamic method, will be also discussed because the complexing parameters may be affected by some kinetic limitations if equilibrium before analysis is not attained and/or the flux of the adsorbed complex is influenced by the lability of the natural complexes in the water sample. For a correct data interpretation and system characterization the comparison of results obtained from different techniques seems essential in the articulation of a serious discussion of their meaning.

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Comparison of Analytical Techniques for Dynamic Trace Metal Speciation in Natural Freshwaters

Cited by 181 publications

References 34 publications

Metal Bioavailability in the Sava River Water

Metal Bioavailability in the Sava River Water

Metal speciation from stream to open ocean: modelling v. measurement

Electrochemical Methods for Speciation of Trace Elements in Marine Waters. Dynamic Aspects

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