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Metal speciation in rivers affected by enhanced soil erosion and acidity
KTH, School of Architecture and the Built Environment (ABE), Land and Water Resources Engineering, Environmental Geochemistry and Ecotechnology.ORCID iD: 0000-0001-8771-7941
2012 (English)In: Applied Geochemistry, ISSN 0883-2927, E-ISSN 1872-9134, Vol. 27, no 4, 906-916 p.Article in journal (Refereed) Published
Abstract [en]

Dissolved (<1 kDa), colloidal (1 kDa-0.45 mu m) and particulate (>0.45 mu m) size fractions of 30 elements were determined for four rivers (Sirppujoki, Laajoki, Mynajoki and Paimionjoki), including 12 low-order inflow streams, largely affected by soil erosion and acidity in SW Finland. In addition, geochemical modelling was used to predict the formation of free ions and complexes in these rivers. Total metal concentrations were relatively high but most of the elements occurred mainly in a colloidal or particulate form and even elements expected to be very soluble occurred to a large extent in colloidal form. According to geochemical modelling these patterns could be explained by in-stream metal complexation/adsorption only to a limited extent. Instead there were strong indications that the high metal concentrations and dominant solid fractions were largely caused by erosion of metal bearing phyllosilicates. A strong influence of acid sulphate (AS) soils, known to exist in the catchment, could be clearly distinguished in Sirppujoki river as it had very high concentrations of dissolved metals, while in the two nearby rivers (Laajoki and Myna joki) the influence of AS soils was largely masked by eroded phyllosilicates. In Paimionjoki river the colloidal and particulate fractions dominated very strongly, indicating that total metal concentrations are almost solely controlled by erosion of phyllosilicates. Consequently, rivers draining clay plains sensitive to erosion, like those in SW Finland, have generally high "background'' metal concentrations due to erosion of relatively non-toxic colloidal/particulate phyllosilicates. Thus, relying on only semi-dissolved (<0.45 mu m) concentrations obtained in routine monitoring and/or speciation modelling can lead to a great overestimation of the water toxicity in this environment.

Place, publisher, year, edition, pages
2012. Vol. 27, no 4, 906-916 p.
National Category
Environmental Engineering
URN: urn:nbn:se:kth:diva-92328DOI: 10.1016/j.apgeochem.2012.01.009ISI: 000301125400009ScopusID: 2-s2.0-84857799822OAI: diva2:516696
QC 20120419Available from: 2012-04-19 Created: 2012-04-02 Last updated: 2012-04-19Bibliographically approved

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