Significance of oxides and particulate organic matter in controlling trace metal partitioning in a contaminated estuary

Turner, Andrew; Millward, G.E.; Roux, Sophie M. Le

doi:10.1016/j.marchem.2004.03.008

Cited by 114 publications

(41 citation statements)

References 43 publications

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“…2 Total (P) and bioavailable (P A ) phosphorus in the river bed sediments, where BS1 is the most upstream sample and BS14 is the most downstream sample. Error bars indicate standard deviations coatings, formed by Fe and Mn oxides, as well as organic matter, can suppose until a 50% of the total superficial area of the sediments (Turner et al 2004). The importance of coatings is also important by the fact that, in many rivers, a high percentage of the contaminants are associated to the organic matter (Förstner and Wittmann 1983;Mendiguchía et al 2005).…”

Section: Evaluation Of Total Phosphorus Concentrations In the Soil Smentioning

confidence: 99%

Phosphorus transfer across boundaries: from basin soils to river bed sediments

et al. 2011

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Purpose The study of phosphorus (P) transfer from soils to rivers is a subject of interest as there is a clear relation between land use and water quality. P transfer in the soil/sediment system was evaluated by comparing the concentrations of total (P T ) and bioavailable P (P A ). Materials and methods Phosphorus concentrations were measured in three different compartments following the natural transport route in a basin: soils, suspended and riverbed sediments. Soils were sampled from five different types of land cover: cropped land, forest, pasture, river banks and road taluses (roadside open earthen ditches). Samples were taken from two different sub-basins: the Grande and the upper Anllóns sub-basins. Results and discussion The highest concentrations of P were found in the suspended sediments, followed by the riverbed sediments and the soils. The cropped and pasture soils contained the highest amounts of P. The P A /P ratio was very low in the soils (<0.3), but was significantly higher in the sediments, particularly in the suspended sediments (0.67). The concentration of P A was also significantly higher in the suspended sediments and riverbed sediments than in the river basin soils, with concentration factors of 300% for P and 2,600% for P A , either in suspended and bed sediments being slightly higher in the suspended than in the bed sediments , which suggests the potential environmental risk of P transfer to the river courses via soil. Conclusions Comprehensive studies involving P transfer across soils-suspended sediments-bed sediments are scarce, highlighting the innovative nature of the present study. The results obtained will allow the evaluation of the impact of different types of land use on the sustainability of the aquatic ecosystem at a catchment scale.

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Section: Evaluation Of Total Phosphorus Concentrations In the Soil Smentioning

confidence: 99%

Phosphorus transfer across boundaries: from basin soils to river bed sediments

et al. 2011

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“…These results show that association of mercury to organic matter is more important than the increase in surface area; other important bearing phases for mercury like iron and manganese oxyhydroxides can also disturb the expected relationship with sediment fine fraction. However, in estuaries, sediment organic matter can be considerably more important than Fe-Mn oxides in mercury sorption (Turner et al 2004). Although most of the sampling stations are located in areas with low hydrodynamics, they have, as most depositional areas do, a higher percentage of sediment fine fractions.…”

Section: Mercury Concentration In Sediments and Water Columnmentioning

confidence: 99%

Assessment of Mercury in Water, Sediments and Biota of a Southern European Estuary (Sado Estuary, Portugal)

Lillebø

Coelho

Pato

et al. 2010

Water Air Soil Pollut

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“…In fact, the particulate organic matter and the coatings formed by Fe and Mn oxides can account for up to 50% of the total surface area of the sediments (Turner et al 2004). It has been observed that although the secondary Fe oxides, considered of high reactivity, are present mainly in the <63 μm fraction, high proportions of these oxides can be found in the coarse fraction of bed sediments and, as a result, they highly influence its reactivity (Al-Sewailem et al 1999;Ewais et al 2000;Poulton and Raiswell 2005).…”

Section: Introductionmentioning

confidence: 99%

Assessment of enrichment factors and grain size influence on the metal distribution in riverbed sediments (Anllóns River, NW Spain)

Rey¹,

Dı́az-Fierros²,

Barral³

2010

Environ Monit Assess

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The metals distribution in the bed sediments of the Anllóns River was studied, with special emphasis on the evaluation of the metal distribution as a function of the granulometric fraction chosen for the analysis. Statistical significant differences between the distribution of K, Ca, Cr, Mn, As, Rb, Sr and Nb in the bulk (<2 mm) and fine fraction (<63 μm) were not found. Fe, Ni, Cu, Ga, Zr, Zn and Pb commonly appear in higher concentrations in the fine fraction, whereas Ti appears in higher concentrations in the bulk fraction. In general, it was observed that contamination phenomena tend to equalise the concentrations of both fractions, and this was mainly explained as the result of two processes. First, the formation of coatings over sands and, second, the formation of large aggregates (pseudo-sands) at sites located over basic rocks, whose chemical behaviour is closer to that of clays and could be responsible for significant adsorption processes. Normalisation techniques to evaluate contamination were applied by testing Nb, Sr, Rb or Ga as normaliser elements and by using crustal or shale average values for background concentrations. The most satisfactory result was obtained when using shale average values and Ga as the normaliser element. Arsenic was identified as the main contaminant of the basin, exceeding in all cases the low-effect reference values proposed by sediment quality guidelines and in two cases the medium-effect reference values. These sites were identified by multivariate techniques, which allow differentiating site 10 as affected by anthropogenic inputs related to past mining activities.

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Significance of oxides and particulate organic matter in controlling trace metal partitioning in a contaminated estuary

Cited by 114 publications

References 43 publications

Phosphorus transfer across boundaries: from basin soils to river bed sediments

Phosphorus transfer across boundaries: from basin soils to river bed sediments

Assessment of Mercury in Water, Sediments and Biota of a Southern European Estuary (Sado Estuary, Portugal)

Assessment of enrichment factors and grain size influence on the metal distribution in riverbed sediments (Anllóns River, NW Spain)

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