In situ speciation measurements of trace components in natural waters using thin-film gels

Davison, William; Zhang, H.

doi:10.1038/367546a0

Cited by 1,107 publications

(697 citation statements)

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“…They facilitate determination of the time-integrated average metal concentrations after long-term deployment in natural waters (Zhang and Davison 1995). They also provide an advantage of determining exclusively the labile metal species in natural waters (Davison and Zhang 1994) which are very often associated to the biological response in aquatic organisms (Campbell 1995). DGT method is based on the diffusion of dissolved metal species through a polyacrylamide gel and their immobilization in a chelating (Chelex) resin (Zhang and Davison 1995).The kinetically inert organic species are excluded by this method, as well as large colloids, because the pore size of 2-5 nm in diffusive gel does not enable their diffusion (Zhang and Davison 1995).…”

Section: Labile Metal Concentrations In the Sava River Water Measuredmentioning

confidence: 99%

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 Measuredmentioning

confidence: 99%

Metal Bioavailability in the Sava River Water

Dragun

Marijić

Vuković³

et al. 2014

The Handbook of Environmental Chemistry

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“…In such particular conditions [19], the speciation and bioavailability of TM must be considered at two different time scales: (i) the time scale of the bio-uptake flux, as determined by diffusion of the bioactive free metal, dissociation of the bioinactive complex species, and the internalization rate; and (ii) the time scale of depletion of the bulk medium. Donnan Membrane Technique (DMT) [35] as well as Diffusive Gradient in Thin film (DGT) [36] could provide such type of information provided that the analytical approach allows to work at very low TM concentrations levels as well as in anaerobic conditions. Also a link between TM bioavailability and the microbial community response should be better understood [37].…”

Section: Trace Metals Speciation Fractioning and Bioavailabilitymentioning

confidence: 99%

Fate of Trace Metals in Anaerobic Digestion

Fermoso

Hullebusch²,

Guibaud

et al. 2015

Biogas Science and Technology

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A challenging, and largely uncharted, area of research in the field of anaerobic digestion science and technology is in understanding the roles of trace metals in enabling biogas production. This is a major knowledge gap and a multifaceted problem involving metal chemistry; physical interactions of metal and solids; microbiology; and technology optimization. Moreover, the fate of trace metals, and the chemical speciation and transport of trace metals in environmentsoften agricultural lands receiving discharge waters from anaerobic digestion processes -is completely unknown but simultaneously represents challenges for environmental protection and opportunities to close process loops in anaerobic biotechnologies. Affiliation 1.

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“…Labile metal concentrations in both the seawater and the sediment porewater from the study sites were determined using the diffusive gradients in thinfilms (DGT) technique (Davidson & Zhang, 1994;Zhang & Davidson, 1995;Zhang, Zhao, Sun, Davidson & McGrath, 2001). As only copper concentrations showed a strong association with the distribution of the tailings (Lee et al, 2002), the information presented in this report is restricted to this metal.…”

Section: Metal Analysesmentioning

confidence: 99%

An assessment of the impact of copper mine tailings disposal on meiofaunal assemblages using microcosm bioassays

Lee

Correa

2007

Marine Environmental Research

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Microcosms were used to assess the impact of copper mine tailings disposal on the littoral meiofaunal assemblages of the Atacama region of northern Chile. The specific purpose was to establish a cause and effect relationship between the elevated copper concentrations and altered meiofaunal assemblages observed at the study sites. Meiofaunal assemblages were exposed to a series of copper concentrations to assess general toxicity, both densities and taxa diversities decreased with increasing copper. Natural coarse sediments were mixed with a tailings substitute to assess the physical impact of the tailings dumping on meiofaunal assemblages. Meiofaunal assemblage densities increased with increasing amounts of tailings substitute, entirely due to an increase in surface utilising foraminiferans. However, taxa diversities decreased as the interstitial spaces became blocked. Finally, the microcosms were used to conduct bioassays of sediments and seawaters from the impacted sites. The sediments from the impacted sites proved to be toxic resulting in reduced meiofau- Preprint submitted to Elsevier Science 1 November 2006ACCEPTED MANUSCRIPT nal densities and taxa diversities. Seawater samples did not prove to be significantly toxic. The use of microcosms has allowed the effects of the physical and chemical components of tailings to be assessed individually, which was not possible in the field. Additionally, it allowed a cause and effect relationship to be established between elevated concentrations of porewater copper observed in the field and the reduced densities and taxa diversities of the meiofaunal assemblages observed at the same sites.

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In situ speciation measurements of trace components in natural waters using thin-film gels

Cited by 1,107 publications

References 8 publications

Metal Bioavailability in the Sava River Water

Metal Bioavailability in the Sava River Water

Fate of Trace Metals in Anaerobic Digestion

An assessment of the impact of copper mine tailings disposal on meiofaunal assemblages using microcosm bioassays

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