Temporal variations of colloidal carrier phases and associated trace elements in a boreal river

Elemental size distributions, from truly dissolved through colloidal to particulate, have been studied in a subarctic boreal river. The measurements, carried out during 2002, ranged from winter to summer conditions, including an intense spring flood event. Results are reported for a total of 42 elem...

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Bibliographic Details
Published in:Geochimica et cosmochimica acta 2007, Vol.71 (22), p.5339-5354
Main Authors: Dahlqvist, Ralf, Andersson, Karen, Ingri, Johan, Larsson, Tobias, Stolpe, Björn, Turner, David
Format: Article
Language:English
Subjects:
Applied Geology
Chemical Sciences
diffusive gradients
Earth sciences
field-flow fractionation
Freshwater
Geovetenskap
isotopic composition
kalix river
Kemi
NATURAL SCIENCES
natural-waters
NATURVETENSKAP
northern sweden
rare-earth-elements
size distributions
thin-films
Tillämpad geologi
weathering rates
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Summary:Elemental size distributions, from truly dissolved through colloidal to particulate, have been studied in a subarctic boreal river. The measurements, carried out during 2002, ranged from winter to summer conditions, including an intense spring flood event. Results are reported for a total of 42 elements. Size distributions were characterised using a combination of cross-flow (ultra)filtration (CFF), flow field-flow fractionation (FlFFF), and diffusive gradients in thin-films (DGT). The three techniques showed similar trends, but quantitative comparisons reveal some important differences that warrant further investigation. Previous work has identified two colloidal carrier phases in fresh waters, dominated by iron and carbon, respectively. The majority of the elements studied are associated with one or both of these colloidal carrier phases. The exceptions are the alkali metals and several anions that are only very weakly associated with colloidal material, and which therefore occur mainly as truly dissolved material (
ISSN:0016-7037
1872-9533
1872-9533
DOI:10.1016/j.gca.2007.09.016