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Temporal variations in dissolved and suspended iron and manganese in the Kalix River, northern Sweden
Luleå University of Technology.
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Geosciences and Environmental Engineering.ORCID iD: 0000-0003-2276-0564
Luleå University of Technology.
1990 (English)In: Chemical Geology, ISSN 0009-2541, E-ISSN 1872-6836, Vol. 81, no 1-2, p. 121-131Article in journal (Refereed) Published
Abstract [en]

Particulate and dissolved Fe and Mn were measured once a week from May to September 1982 in the Kalix River, north Sweden. During winter baseflow the dissolved Fe concentration was 450 mu g 1 super(-1). Early snow-melt discharge increased the concentration slightly but during springflood maximum the concentration decreased to a minimum value of 60 mu g 1 super(-1) in mid-July. Particulate matter in the Kalix River is dominated by Fe which ranges between 14% and 38% of the ashed suspended load, similar to 70-80% of the total Fe load being retained by 0.45- mu m filters. Approximately 10% of particulate Fe can be accounted for by a detrital phase. The particulate Fe/Al ratio showed a mean value of 6.5 which is more than ten times the ratio in mean world river. Particulate Fe showed a peak during early snowmelt and decreased during maximum discharge similar to dissolved Fe. Dissolved Mn concentrations ranged from 1.1 to 53.4 mu m 1 super(-1) with a mean value of 11.2 plus or minus 12.4 mu g 1 super(-1), whereas particulate Mn ranged from 3.1 ti 18.2 mu g 1 super(-1), with a mean concentration of 10.6 plus or minus 4.9 mu g 1 super(-1). During May and June most Mn was transported in the dissolved phase whereas in July and August the particulate fraction dominated. There was a drastic increase in non-detrital particulate Mn with a concomitant decrease in the dissolved fraction in early July with peak values in mid-July and early August. The decrease in dissolved Mn and increase of particulate Mn is probably the consequence of two processes, namely addition of non-detrital particulate Mn to the river, possibly from lakes, and transformation of dissolved Mn to a particulate phase within the river. A combination of increased pH, temperature and particulate Mn triggered the precipitation of dissolved Mn, although the significance of each factor can not be evaluated from this study.

Place, publisher, year, edition, pages
1990. Vol. 81, no 1-2, p. 121-131
National Category
Geochemistry
Research subject
Applied Geology
Identifiers
URN: urn:nbn:se:ltu:diva-7039DOI: 10.1016/0009-2541(90)90042-6ISI: A1990CR12000008Scopus ID: 2-s2.0-0025114310Local ID: 55c515b0-d7ba-11db-a1bf-000ea68e967bOAI: oai:DiVA.org:ltu-7039DiVA, id: diva2:979926
Note

Godkänd; 1990; 20070321 (pafi)

Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-07-10Bibliographically approved

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Ingri, JohanBurman, Jan-Ola

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