Estuarine behaviour of metal loads leached from coastal lowland acid sulphate soils

Linda Nordmyr*, Peter Österholm, Mats Åström

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

58 Citations (Scopus)


The estuarine behaviour of the metal load leaching from acid sulphate (AS) soils was studied in a selected river system (the Vörå River), in western Finland. Large amounts of metals were transported with the river and deposited within the estuary, causing highly elevated metal concentrations in both the sediment traps and in the underlying bottom sediments. Among the metals, there was a diverging deposition pattern where Al, Cu, La and U demonstrated a strong association with organic matter and were deposited within approximately 4 km from the river mouth. In contrast, the deposition of Co, Mn, Ni and Zn occurred when pH reached circumneutral conditions further out in the estuary. Yet other metals were not abundantly leached from the AS soils and thus not elevated in the river and estuary (Fe, Ti, Cr, V). Five separate chemical extractions indicated the geochemical speciation of the metals.

Original languageEnglish
Pages (from-to)378-393
Number of pages16
JournalMarine Environmental Research
Issue number3
Publication statusPublished - Sept 2008
MoE publication typeA1 Journal article-refereed


  • Acid sulphate soils
  • Baltic Sea
  • Estuarine sediments
  • Metal load
  • Sediment-trap material
  • Vörå River


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