Comparison of the partitioning of trace metals in the Humber and Mersey estuaries

Comber, Sean; Gunn, A. M.; Whalley, Caroline

doi:10.1016/0025-326x(95)00092-2

Cited by 86 publications

(29 citation statements)

References 19 publications

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“…The reduction percentages for Cu (47%) and Pb (42%) reported by Baeyens et al (2001) are of the same order of magnitude as those resulting from measurements in the dissolved (Cu is 35% and Pb is 50%) and particulate phases (Cu is 53% and Pb is 30%) at the mouth of the Scheldt estuary in the periods 1981-1983and 1995-1998 Cd the former estimate (64%) is slightly higher than the latter ones (dissolved is 55% and particulate is 58%), while for zinc the reductions measured at the mouth (dissolved is 50% and particulate is 30%), are too low compared to the 55% reduction reported by Baeyens et al (2001). The fact that zinc is analysed with the lowest accuracy (Parmentier, 2003) is perhaps a possible explanation.…”

Section: Resultssupporting

confidence: 62%

Overview of trace metal contamination in the Scheldt estuary and effect of regulatory measures

et al. 2005

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Seasonally, dissolved and particulate metal concentrations in the Scheldt estuary were assessed over a period of 4 years (1995)(1996)(1997)(1998). High quality data were obtained following stringent analytical protocols for each step: sampling, sample treatment, sample storage and analysis. Of the 5 trace metals, Ni showed the most conservative behaviour, while Cd and Cu were clearly transferred from the particulate to the dissolved phase in the middle estuary. A substantial part of the particulate metals entering the estuarine system are lost through sedimentation. General seasonal patterns are the following: lower concentrations in spring and higher ones in winter (sometimes late fall/early winter) for dissolved metals, while in summer a pronounced rise of the longitudinal concentration profile is observed for the particulate metals. A comparison of the trace metal concentrations (dissolved and particulate) at the mouth of the estuary in 1995-1998 with those from 1981 to 1983, reveal reductions between 30 and 58%. Reductions based on direct emission measurements for almost the same period suggest reductions (dissolved + particulate) between 42 and 64%. Biomagnification (BMF) is the accumulation of a compound through the foodchain. It is in our case expressed as the ratio of the metal concentration in the organism (lg g )1 , d.w.)/the metal concentration in total suspended matter (lg g )1 , d.w.). Almost all BMF-values of Periwinkle, Nereis diversicolor and Macoma balthica (3 bottom organisms in the Scheldt estuary) are negative meaning that these organisms contain less heavy metals than the particulate suspended matter. For all organisms log BMFs for Pb, respectively Ni, are around )1.8, respectively )0.7. For Cd, Periwinkle shows slight enrichment (0.05) and for Cu even more (0.45), while negative values were observed for Nereis diversicolour and Macoma balthica. The latter organisms are more enriched in Zn ()0.09) than Periwinkle ()0.43).

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Section: Resultssupporting

confidence: 62%

Overview of trace metal contamination in the Scheldt estuary and effect of regulatory measures

et al. 2005

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“…To summarize, Cd fractionation is dominated by the reducible and carbonate fractions followed by the oxidizable and residual fractions. These observations are nevertheless hardly in agreement with Cd partition studies of sediments from other polluted European rivers mainly because of the variable geochemical characteristics of the sedimentary material in which metallic pollution occurs (Comber, Gunn, & Whalley, 1995;Jones & Turki, 1997;Korfali & Davies, 2004).…”

Section: Metal Fractionationcontrasting

confidence: 40%

Environmental Impacts of Heavy Metal Discharges from a Smelter in Deûle-canal Sediments (Northern France): Concentration Levels and Chemical Fractionation

Boughriet

Proix²,

Billon

et al. 2006

Water Air Soil Pollut

106

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Heavy metal pollution in sediments derived from the Deûle canal and sampled at different sites not far from a smelting plant has been examined in the present work in order to identify the sources of these metals and to assess the sediment environmental quality. The total concentrations of lead, zinc, cadmium, thallium, indium and tin in the samples were determined using inductively coupled plasmaatomic emission spectroscopy (ICP-AES). Our investigations have revealed that metal pollution is readily apparent in the studied sediments, with metals contents largely exceeding those measured in the background soils: maximum values are obtained for sediments collected near the industrial zone. The chemical forms of Pb, Zn, Cd, Tl, In and Sn in these sediments have also been studied using a sequential extraction method in order to evaluate their possible mobility, bioavailability and toxicity in this aquatic environment. Overall, the averaged fractionation of Pb and Zn is dominated, in a decreasing order, by the easily reducible, oxidizable and carbonate fractions. The importance of oxidizable phase (which is assumed to be composed mainly of organic matter and sulphides) in the Pb and Zn fractionations has been confirmed by the detection of X-ray diffraction peaks ascribed to galena (PbS) and wurtzite (ZnS) in contaminated sediment samples. Anthropogenic Tl, In, and Cd are mainly retained in Fe-Mn oxides/ hydroxides, whereas anthropogenic Sn predominates in aluminosilicates/clays. We suspect that elevated percentage levels of Pb, Zn, Cd and In in the reducible fraction constitute a particular potential risk to this aquatic environment in case early diagenetic phenomena (that are observed in the sedimentary material) and physical disturbances (that occur in the water column) both take place strongly in the medium.

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“…Fe-Mn oxides seem to play a major role in zinc accumulation in the profile, as precipitation and co-precipitation products. The association of zinc with Fe-Mn oxides in soil has been widely recognised (Kuo et al, 1983;Comber et al, 1995;Jones and Turkie, 1997). The sorption of zinc in soil and sediments strongly imparts its mobility in the environment.…”

Section: Chemical Fractionation Of Heavy Metals In Soils Aroud Oil Inmentioning

confidence: 99%

Chemical fractionation of heavy metals in soils around oil installations, Assam

Kotoky

Bora

Baruah

et al. 2003

Chemical Speciation & Bioavailability

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Comparison of the partitioning of trace metals in the Humber and Mersey estuaries

Cited by 86 publications

References 19 publications

Overview of trace metal contamination in the Scheldt estuary and effect of regulatory measures

Overview of trace metal contamination in the Scheldt estuary and effect of regulatory measures

Environmental Impacts of Heavy Metal Discharges from a Smelter in Deûle-canal Sediments (Northern France): Concentration Levels and Chemical Fractionation

Chemical fractionation of heavy metals in soils around oil installations, Assam

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