Comparison of metal release from recent and aged Fe-rich sediments

Cappuyns, Valérie; Swennen, Rudy

doi:10.1016/j.geoderma.2006.08.013

Cited by 24 publications

(7 citation statements)

References 20 publications

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“…Petroleum operations reportedly elevate soil salinity and pH in adjacent soils and sediments, potentially increasing erosion as well as the mobility and availability of forms of heavy metals and metallic salts (Hahne and Kroontje 1973;Guo et al 1997;Neal 2003). Removal of overburden in regions with elevated Fe and manganese (Mn), such as Canada's oil sands region, can also increase the mobility of metals and metalloids like As (Cappuyns and Swennen 2006). These findings, together with previous studies of the effects of land clearing and changes in soil pH/salinity on metal leaching (e.g., Hahne and Kroontje 1973;Fujii et al 1988;Masscheleyn et al 1991;Hobbs 1993;Guo et al 1997;Neal 2003), suggest that land clearing and early development are the predominant contributor to increasing concentrations of elements in seven tributaries of the Athabasca and Clearwater rivers.…”

Section: Effects Of Stage Of Mining Operationsmentioning

confidence: 99%

Assessment of seven Canadian rivers in relation to stages in oil sands industrial development, 1972–2010

Alexander

Chambers

2016

Environ. Rev.

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Abstract:We compiled a 38 year dataset (1972 to 2010) to evaluate changes in water chemistry over time in relation to oil sands mining activities. We examined patterns in three focal elements (dissolved selenium, dissolved arsenic, total vanadium) at 96 sites along seven tributaries of the Athabasca and Clearwater Rivers. Concentrations of the three focal elements did not differ between sites sampled upstream versus downstream of future development, between sites upstream versus downstream of the primary bitumen-bearing geologic formation, or at an upstream site over a 33 year period on the Muskeg River . Hence, longitudinal patterns observed in water chemistry following mine development cannot be attributed to natural background variation. In contrast, concentrations and loads of the three focal elements were greater post-development compared to reference values (p ≤ 0.01), and were typically greatest during the early exploration and land clearing stage of mine development (p < 0.01). Positive correlations between our three focal elements and 17 other variables either associated with bitumen or considered priority pollutants (r ≥ 0.13, p ≤ 0.04) suggest that the historical impacts of oil sands development on water quality extend beyond our three focal parameters. These results indicate that erosion and subsequent runoff associated with land clearing, construction, and early operational activities have affected water quality in the oil sands region. Key words:McMurray Formation, Alberta oil sands, oil sands mining, oil sands processing, trace metals, water quality.Résumé : Afin d'évaluer les changements dans les propriétés chimiques de l'eau au fil du temps en lien avec les activités minières des sables bitumineux, nous avons compilé un ensemble de données sur 38 ans (1972 à 2010) et l'avons utilisé pour examiner les tendances de trois éléments ciblés (le sélénium dissous, l'arsenic dissous, vanadium total) à 96 sites le long de sept affluents des rivières Athabasca et Clearwater. Les concentrations des trois éléments ciblés ne différaient pas entre les sites échantillonnés en amont par rapport à ceux en aval du développement futur, entre les sites en amont par rapport à ceux en aval de la formation géologique primaire de bitume, ou à un site en amont sur une période de 33 ans sur la rivière Muskeg (1976Muskeg ( -2009. Par conséquent, les tendances longitudinales observées dans la chimie de l'eau à la suite du développement minier ne peuvent pas être attribuées à la variation naturelle du milieu. Les concentrations et les charges des trois éléments ciblés, en revanche, étaient plus grandes (p ≤ 0,01) après le développement comparées aux valeurs de référence et étaient typiquement les plus grandes (p < 0,01) pendant la première étape du développement minier, soit l'exploration et le dégagement du terrain. Des corrélations positives (r ≥ 0,13, p ≤ 0,04) entre nos trois éléments ciblés et 17 autres variables liées au bitume ou considérées des polluants en priorité suggèrent que les impacts historiques du développe...

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Section: Effects Of Stage Of Mining Operationsmentioning

confidence: 99%

Assessment of seven Canadian rivers in relation to stages in oil sands industrial development, 1972–2010

Alexander

Chambers

2016

Environ. Rev.

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“…The element release results obtained using this model have been considered useful for predicting the risk of species release from sediments. Cappuyns and Swennen (2006) modified this model in order to fit experimental results considering an additional sediment fraction consisting of the element not released during the pH-static assay; this new fraction can be defined as the difference between the total concentration of the element under study and the concentration released from the two considered fractions according to the model of Schwarz et al (1999). Ho et al (2012) summarises the four types of leaching behaviour that fit to the model of two independent kinetic reactions proposed by Schwarz et al (1999): a very rapid element release at the beginning of the experiment, with equilibrium nearly reached after some hours; an initial rapid release followed by a slow release in the final stage of the assay; an initial rapid release followed by a slow but substantial increase until the end of the leaching test; a slow release with equilibrium not achieved at the end of the experiment, but equilibrium conditions would be achieved at longer times.…”

Section: Introductionmentioning

confidence: 99%

Generalised mathematical model to estimate Zn, Pb, Cd, Ni, Cu, Cr and As release from contaminated estuarine sediment using pH-static leaching tests

Martín-Torre

Ruiz

Galán

et al. 2015

Chemical Engineering Science

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Highlights (3 to 5 bullet points, maximum 85 characters, including spaces)  Trace element time-dependent release based on first order series reactions.  The model fits initial delay of Zn, Pb, Cd and Cu and adsorption of As and Cr.  The model is valid when applied to sediments with different levels of oxidation.  Prediction of time-dependent leaching behaviour in scenarios of acidification.

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“…In this period of time, the initially anoxic sediment was oxidised leading to a pH reduction and an increase in redox potential. Upon oxidation, among other changes in the speciation and binding of metals, sulphides were partially converted to sulphate and to intermediary oxidised sulphur compounds (Calmano et al, 1993;Cappuyns and Swennen, 2006;Tack et al, 1997). Therefore, the colour of the sediment also changed (from very dark brown to brownish).…”

Section: Experimental Methodologymentioning

confidence: 99%

Estuarine sediment resuspension and acidification: Release behaviour of contaminants under different oxidation levels and acid sources

Martín-Torre

Cifrián

Ruiz

et al. 2017

Journal of Environmental Management

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Carbon dioxide (CO) Capture and Storage (CCS) is a technology to reduce the emissions of this gas to the atmosphere by sequestering it in geological formations. In the case of offshore storage, unexpected CO leakages will acidify the marine environment. Reductions of the pH might be also caused by anthropogenic activities or natural events such as acid spills and dredging operations or storms and floods. Changes in the pH of the marine environment will trigger the mobilisation of elements trapped in contaminated shallow sediments with unclear redox boundary. Trace element (As, Cd, Cr, Cu, Ni, Pb and Zn) release from anoxic and oxic estuarine sediment is analysed and modelled under different laboratory acidification conditions using HNO (l) and CO (g): acidification at pH = 6.5 as worst-case scenario in events of CO leakages and acid spills, and acidification at pH = 7.0 as a seawater scenario under CO leakages, acid spills, as well as sediment resuspension. The prediction of metal leaching behaviour appear to require sediment specific and site specific tools. In the present work it is demonstrated that the proposed three in-series reactions model predicts the process kinetics of the studied elements under different simulated environmental conditions (oxidation levels and acid sources). Differences between HNO and CO acidification are analysed through the influence of the CO gas on the ionic competition of the medium. The acidification with CO provokes higher released concentrations from the oxic sediment than from the anoxic sediment, except in the case of Zn, which influences the release of the other studied elements. Slight acidification can endanger the aquatic environment through an important mobilisation of contaminants. The obtained prediction of the contaminant release from sediment (kinetic parameters and maximum concentrations) can contribute to the exposure assessment stage for risk management and preincidental planning in accidental CO leakages and chemical spills scenarios.

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Comparison of metal release from recent and aged Fe-rich sediments

Cited by 24 publications

References 20 publications

Assessment of seven Canadian rivers in relation to stages in oil sands industrial development, 1972–2010

Assessment of seven Canadian rivers in relation to stages in oil sands industrial development, 1972–2010

Generalised mathematical model to estimate Zn, Pb, Cd, Ni, Cu, Cr and As release from contaminated estuarine sediment using pH-static leaching tests

Estuarine sediment resuspension and acidification: Release behaviour of contaminants under different oxidation levels and acid sources

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