Metal speciation in rivers affected by enhanced soil erosion and acidity

Nystrand, Miriam; Österholm, Peter; Nyberg, Maria E.; Gustafsson, Jon Petter

doi:10.1016/j.apgeochem.2012.01.009

Cited by 52 publications

(30 citation statements)

References 61 publications

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“…Both Fe and Pb modelling have been shown by others to produce robust predictions that agree well with measurements in several types of river systems, including acidic (e.g. Tonkin et al 2002;Wällstedt et al 2010;Nystrand et al 2012) and non-acidic conditions (e.g. Tonkin et al 2002;SanchesEspana et al 2006;Balistrieri et al 2007;Hayzoun et al 2015).…”

Section: Metals Governed By Equilibrium Processesmentioning

confidence: 71%

“…In contrast, certain model studies for Al have found good correlations with the measured concentrations (Cory et al 2007;Sjöstedt et al 2010;Nystrand et al 2012), but only under acidic pH conditions. Previous reports of weak modelmeasurement correlations have mainly focused on systems characterized by low dissolved concentrations (e.g.…”

Section: Metals Showing Weak Correlations Between Predictions and Meamentioning

confidence: 81%

“…Comparisons between speciation predictions and observations have been made for different metals in various types of natural systems (Butler et al 2009;Gustafsson et al 2009;Wällstedt et al 2010;Nystrand et al 2012). However, most of these studies have focused on the behaviour of limited number of metals, in acidic waters.…”

Section: Materials Mobilization Via Bank and Bed Erosion Undermentioning

confidence: 99%

“…Even in wellinvestigated acidic systems, reproducing As measurements is more difficult than other metals (e.g. Tonkin et al 2002;Wällstedt et al 2010;Nystrand et al 2012). This difficulty may arise from this metal's complex and potentially multiple interactions with oxides and humic materials (e.g.…”

Section: Metals Showing Weak Correlations Between Predictions and Meamentioning

confidence: 99%

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Speciation and hydrological transport of metals in non-acidic river systems of the Lake Baikal basin: Field data and model predictions

et al. 2016

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The speciation of metals in aqueous systems is central to understanding their mobility, bioavailability, toxicity and fate. Although several geochemical speciation models exist for metals, the equilibrium conditions assumed by many of them may not prevail in field-scale hydrological systems with flowing water. Furthermore, the dominant processes and/or process rates in non-acidic systems might differ from well-studied acidic systems. We here aim to increase knowledge on geochemical processes controlling speciation and transport of metals under nonacidic river conditions. Specifically, we evaluate the predictive capacity of a speciation model to novel measurements of multiple metals and their partitioning, under highpH conditions in mining zones within the Lake Baikal basin. The mining zones are potential hotspots for increasing metal loads to downstream river systems. Metals released from such upstream regions may be transported all the way to Lake Baikal, where increasing metal contamination of sediments and biota has been reported. Our results show clear agreement between speciation predictions and field measurements of Fe, V, Pb and Zn, suggesting that the partitioning of these metals mainly was governed by equilibrium geochemistry under the studied conditions. Systematic over-predictions of dissolved Cr, Cu and Mo by the model were observed, which might be corrected by improving the adsorption database for hydroxyapatite because that mineral likely controls the solubility of these metals. Additionally, metal complexation by dissolved organic matter is a key parameter that needs continued monitoring in the Lake Baikal basin because dependable predictions could not be made without considering its variability. Finally, our investigation indicates that further model development is needed for accurate As speciation predictions under non-acidic conditions, which is crucial for improved health risk assessments on this contaminant.

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Section: Metals Governed By Equilibrium Processesmentioning

confidence: 71%

Section: Metals Showing Weak Correlations Between Predictions and Meamentioning

confidence: 81%

Section: Materials Mobilization Via Bank and Bed Erosion Undermentioning

confidence: 99%

Section: Metals Showing Weak Correlations Between Predictions and Meamentioning

confidence: 99%

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Speciation and hydrological transport of metals in non-acidic river systems of the Lake Baikal basin: Field data and model predictions

et al. 2016

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“…was much lower in comparison with the simple ionic forms, the high proportion of Mn 2? in the total Mn concentration was also observed in the forested catchments of Finland (Nystrand et al 2012). In the Arctic Revelva catchment, a further pH decrease would induce the increase in toxicity of the dissolved Al, while the influence of pH on Pb and Mn toxicity is limited.…”

Section: Heavy Metal Speciationmentioning

confidence: 74%

Arctic catchment as a sensitive indicator of the environmental changes: distribution and migration of metals (Svalbard)

Kozak

Polkowska

Stachnik

et al. 2016

Int. J. Environ. Sci. Technol.

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Arctic regions experience metal pollution, despite their remote location, and the distribution and migration of those metals determine their potential impact on the local environment. Here, a High-Arctic catchment (Revelva, Svalbard) located remotely from human-induced pollution sources is studied with respect to the distribution and migration of chosen trace elements (Ag, Al, As, B, Ba , the highest mean-weighted concentration noted for Sr (42.5 lg L -1 ). The concentrations in the river water were likely influenced by both natural and human-activity-related processes. These factors can produce substances of the same chemical composition (e.g. carbon dioxide, sulphur dioxide and metals may be emitted both by a volcanic eruption and by industrial sources). Therefore, chemometric techniques were used in the current paper to distinguish the multiple sources of pollution in the Revelva catchment. The authors were seeking to determine whether there is indeed evidence for contamination, sufficient to cause environmental damage in polar region. As a result, it was shown that the long-range transport could play an important role in shaping the metal concentration profile of this Arctic tundra environment, capturing both the influence of volcanic eruptions within the region and the human activity in a range of distances from the study site.

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Predicting Metal Bioavailability and Risk of Toxicity in Nigerian Surface Waters: Are the Existing User‐Friendly Bioavailability Tools Applicable?

Bawa-Allah

Bulama

Hamzat

et al. 2022

Enviro Toxic and Chemistry

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In the present study, we assessed the use of existing user‐friendly bioavailability tools to predict metal bioavailability and the risk of toxicity in a typical Nigerian surface water. The effect of prevailing water chemistry on toxicity of metals was also assessed in laboratory studies. Surface water samples were collected at four locations downstream in the Ogun River in Lagos State, and water chemistry analysis was carried out using standard methods. Relevant parameters were inputted into the Bio‐Met software and Metal Bioavailability Assessment Tool (M‐Bat), which are run on a Microsoft Excel spreadsheet, to obtain the site‐specific hazardous concentrations affecting 5% of the population (HC5)/predicted‐no‐effect concentrations (PNECs) for selected metals and risk characterization ratios (RCRs) at locations downstream in the river. Assessments using the bioavailability tools showed that two locations, Owode‐Onirin and Kara, were more sensitive to Zn and Pb inputs compared to the other locations. The RCRs for Cu, Zn, and Pb, respectively, were >1 at all locations, indicating a potential risk of toxicity to aquatic life. Results from laboratory studies conformed with predictions from the bioavailability tools because Zn and Pb were more toxic to aquatic organisms in surface water collected from Owode‐Onirin and Kara locations, respectively, compared to toxicity in surface water from other locations. The issue of bioavailability in metal pollution control is widely accepted and has been incorporated into water quality guidelines (WQGs) in the United States, the United Kingdom, and Europe. In the absence of regulations incorporating bioavailability in developing countries including Nigeria, it is essential to assess the applicability of existing methods incorporating bioavailability to surface waters in this region. Findings from such studies will facilitate the development of region‐specific WQGs for metals which will be protective of locally relevant aquatic life. Environ Toxicol Chem 2022;41:2537–2547. © 2022 SETAC

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Metal speciation in rivers affected by enhanced soil erosion and acidity

Cited by 52 publications

References 61 publications

Speciation and hydrological transport of metals in non-acidic river systems of the Lake Baikal basin: Field data and model predictions

Speciation and hydrological transport of metals in non-acidic river systems of the Lake Baikal basin: Field data and model predictions

Arctic catchment as a sensitive indicator of the environmental changes: distribution and migration of metals (Svalbard)

Predicting Metal Bioavailability and Risk of Toxicity in Nigerian Surface Waters: Are the Existing User‐Friendly Bioavailability Tools Applicable?

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