Accumulation of heavy metals in Oostriku peat bog, Estonia: site description, conceptual modelling and geochemical modelling of the source of the metals
2004 (English)In: Environmental Geology, ISSN 0943-0105, E-ISSN 1432-0495, Vol. 45, 731-742 p.Article in journal (Refereed) Published
Oxidation of sulphides leads to the dissolution of metals, which are transported with water and accumulate at geochemical barriers. Such barriers can form in peat bogs. This paper gives an introduction into the long-term processes in Oostriku peat bog where high accumulations of heavy metals are observed. Peat and water samples are analysed for Fe, As and heavy metals (Cd, Cu, Mn, Ni, Pb and Zn) using different methods. A concept is based on the observations. Metals are leached by sulphide oxidation in the carbonate rocks upstream of the peat. The water feeds the peat from below. The metals are sorbed and precipitated in the peat. The sulphide oxidation is simulated to examine the origin and metal speciation in the water. The simulated solution is compared with the groundwater entering the peat. The results showed a fair agreement for the major constituents. There were considerable differences for species with low concentrations.
Place, publisher, year, edition, pages
2004. Vol. 45, 731-742 p.
peat bog, heavy metals, sulphide oxidation, model
IdentifiersURN: urn:nbn:se:kth:diva-7877DOI: 10.1007/s00254-003-0931-xISI: 000220519700014ScopusID: 2-s2.0-1642367508OAI: oai:DiVA.org:kth-7877DiVA: diva2:13035
QC 201010012005-10-212005-10-212010-10-01Bibliographically approved