In situ high resolution measurements of fluxes of Ni, Cu, Fe, and Mn and concentrations of Zn and Cd in porewaters by DGT

Zhang, H.; Davison, William; Miller, Sharon K.; Tych, Włodek

doi:10.1016/0016-7037(95)00293-9

Cited by 329 publications

(211 citation statements)

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“…The MINTEQA2 code, incorporating new equilibrium constants for sphalerite, covellite, and amorphous CuS (Table l), indicates large-scale supersaturation with regard to the crystalline Zn sulfides and all the Cu(I1) sulfides (Table 2). Zhang et al (1995) measured pore-water concentrations of dissolved Cu of l-2 nmol liter -1 in July 1993, but these lower levels would have little impact on the degree of Cu(II)-sulfide supersaturation. The results indicate either that the attributed speciation is incorrect due to inadequacies in the model, including the questionable occurrence of dissolved Cu(II), or that precipitation of the pure sulfides is kinetically constrained.…”

Section: Dissolved Zn and Cu Distributions-dissolvedmentioning

confidence: 98%

The biogeochemical cycling of Zn, Cu, Fe, Mn, and dissolved organic C in a seasonally anoxic lake

Hamilton−Taylor

Davison

Morfett

1996

Limnology & Oceanography

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Detailed time-depth distributions of dissolved Zn, Cu, Fe, Mn, and dissolved organic C (DOC), together with pH, were obtained for the water column and near-surface sediment pore waters of a seasonally anoxic lake (Esthwaite Water, U.K.) over a 1 -yr period. Dissolved Fe and Mn followed well-known patterns linked to redox recycling. The variation in DOC resulted mostly from its coupling with Fe, DOC being coprecipitated with Fe oxide and released into solution on the reductive remobilization of' the oxide. This process produced a > 7-fold seasonal variation in DOC concentrations in the pore waters, with a maximum of -7 mg liter-l. Dissolved Zn and Cu exhibited coherent and similar distribution patterns unrelated in any simple way to the distributions of dissolved Fe and Mn, pH, and DOC. The most ubiquitous feature of the distribution of dissolved Zn, and to a lesser degree that of dissolved Cu, was a concentration maximum at the sedimentwater interface, which disappeared completely only when anoxia was maximal in mid-and late summer. The interfacial maxima were attributed to rapid release from freshly deposited particles allied to sulfide precipitation in the sediments. The timing of events, associated with an increase in interfacial dissolved Cu and Zn concentrations before and during a period of ice cover, indicated that the Cu was derived from Fe and possibly Mn oxides and Zn from planktonic algae. The cumulative downward diffusive fluxes of Zn and Cu from the interfacial maxima were unimportant (-1% of total) compared to total metal sedimentation rates. Chemical equilibrium calculations indicated that Zn-and Cu-sulfide complexes dominated in the pore waters under reducing conditions, with humic binding being insignificant, and that precipitation as pure sulfides or coprecipitation with FeS were likely major removal processes for Zn and Cu under anoxic conditions.It is apparent from the limited available information that trace metal distributions in lakes are complex and generally do not show the model (e.g. biologically recycled and scavenged) vertical profiles seen in the oceans (see Murray 1987;Hamilton-Taylor and Davison 1995). This complexity has been attributed to various environmental factors, including the highly dynamic nature of lakes where inputs, mixing, and removal processes can vary significantly on a variety of time scales, the greater availability of competing scavenging phases, the varied chemical composition of lake waters, and the compressed depth scales. Insight into biogeochemical processes has been afforded by considering detailed temporal changes in trace metal distributions in the water columns of lakes (e.g. Baccini and Joller 198 1;Balistrieri et al. 1992). We found no comparable temporal data for the highly active site of the sediment-water interface. This paper provides detailed time-depth distributions of dissolved Zn, Cu, Fe, and Mn, together with DOC and pH, in the water column and near-surface pore waters of a circumneutral, productive, seasonally anoxic lake. Acknowledg...

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Section: Dissolved Zn and Cu Distributions-dissolvedmentioning

confidence: 98%

The biogeochemical cycling of Zn, Cu, Fe, Mn, and dissolved organic C in a seasonally anoxic lake

Hamilton−Taylor

Davison

Morfett

1996

Limnology & Oceanography

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“…This hypothesis of greater concentrations of free Ni 2+ , compared to free Pb , was supported by experimental characterization of pore water metal speciation in selected VT sediments (SC2, WF3, BF4) during the 2004 sediment toxicity tests . This study used metals sequestered into 'diffusion gradient thin-film' (DGT) samplers (Zhang et al, 1995) to indicate the relative availability of free metal ions in pore waters. DGT samplers accumulated more Ni than Pb from all three sediments, despite consistently greater concentrations of Pb measured in filtered pore waters.…”

Section: Article In Pressmentioning

confidence: 99%

Ecological impacts of lead mining on Ozark streams: Toxicity of sediment and pore water

Besser

Brumbaugh

Allert

et al. 2009

Ecotoxicology and Environmental Safety

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a b s t r a c tWe studied the toxicity of sediments downstream of lead-zinc mining areas in southeast Missouri, using chronic sediment toxicity tests with the amphipod, Hyalella azteca, and pore-water toxicity tests with the daphnid, Ceriodaphnia dubia. Tests conducted in 2002 documented reduced survival of amphipods in stream sediments collected near mining areas and reduced survival and reproduction of daphnids in most pore waters tested. Additional amphipod tests conducted in 2004 documented significant toxic effects of sediments from three streams downstream of mining areas: Strother Creek, West Fork Black River, and Bee Fork. Greatest toxicity occurred in sediments from a 6-km reach of upper Strother Creek, but significant toxic effects occurred in sediments collected at least 14 km downstream of mining in all three watersheds. Toxic effects were significantly correlated with metal concentrations (nickel, zinc, cadmium, and lead) in sediments and pore waters and were generally consistent with predictions of metal toxicity risks based on sediment quality guidelines, although ammonia and manganese may also have contributed to toxicity at a few sites. Responses of amphipods in sediment toxicity tests were significantly correlated with characteristics of benthic invertebrate communities in study streams. These results indicate that toxicity of metals associated with sediments contributes to adverse ecological effects in streams draining the Viburnum Trend mining district.Published by Elsevier Inc.

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“…The pore water concentration was then derived from the estimated diffusive flux through the gel following the established procedure (e.g. Zhang et al, 1995;Naylor et al, 2004).…”

Section: Pore Water Analysesmentioning

confidence: 99%

“…These phases are frequently intimately associated with one another (Perret et al, 2000;Taillefert et al, 2002), making it difficult to separate them by physical and chemical techniques. Decomposition of OM and reductive dissolution of Fe and Mn-oxides, which tend to be highest near the sediment water interface (SWI; Canavan et al, 2006;Douglas and Adeney, 2000), may lead to release of trace metals to the pore waters (Zhang et al, 1995).…”

Section: Introductionmentioning

confidence: 99%

Geochemistry of trace metals in a fresh water sediment: Field results and diagenetic modeling

Canavan¹,

Cappellen²,

Zwolsman³

et al. 2007

Science of The Total Environment

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Concentrations of Fe, Mn, Cd, Co, Ni, Pb, and Zn were determined in pore water and sediment of a coastal fresh water lake (Haringvliet Lake, The Netherlands). Elevated sediment trace metal concentrations reflect anthropogenic inputs from the Rhine and Meuse Rivers. Pore water and sediment analyses, together with thermodynamic calculations, indicate a shift in trace metal speciation from oxide-bound to sulfide-bound over the upper 20 cm of the sediment. Concentrations of reducible Fe and Mn decline with increasing depth, but do not reach zero values at 20 cm depth. The reducible phases are relatively more important for the binding of Co, Ni, and Zn than for Pb and Cd. Pore waters exhibit supersaturation with respect to Zn, Pb, Co, and Cd monosulfides, while significant fractions of Ni and Co are bound to pyrite. A multi-component, diagenetic model developed for organic matter degradation was expanded to include Zn and Ni dynamics. Pore water transport of trace metals is primarily diffusive, with a lesser contribution of bioirrigation. Reactions affecting trace metal mobility near the sediment-water interface, especially sulfide oxidation and sorption to newly formed oxides, strongly influence the modeled estimates of the diffusive effluxes to the overlying water. Model results imply less efficient sediment retention of Ni than Zn. Sensitivity analyses show that increased bioturbation and sulfate availability, which are expected upon restoration of estuarine conditions in the lake, should increase the sulfide bound fractions of Zn and Ni in the sediments.

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In situ high resolution measurements of fluxes of Ni, Cu, Fe, and Mn and concentrations of Zn and Cd in porewaters by DGT

Cited by 329 publications

References 23 publications

The biogeochemical cycling of Zn, Cu, Fe, Mn, and dissolved organic C in a seasonally anoxic lake

The biogeochemical cycling of Zn, Cu, Fe, Mn, and dissolved organic C in a seasonally anoxic lake

Ecological impacts of lead mining on Ozark streams: Toxicity of sediment and pore water

Geochemistry of trace metals in a fresh water sediment: Field results and diagenetic modeling

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