TY - JOUR
T1 - Estuarine behaviour of metal loads leached from coastal lowland acid sulphate soils
AU - Nordmyr, Linda
AU - Österholm, Peter
AU - Åström, Mats
PY - 2008/9
Y1 - 2008/9
N2 - 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.
AB - 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.
KW - Acid sulphate soils
KW - Baltic Sea
KW - Estuarine sediments
KW - Metal load
KW - Sediment-trap material
KW - Vörå River
KW - Acid sulfate soil
KW - Metals/chemistry
KW - Estuary
UR - http://www.scopus.com/inward/record.url?scp=48149110132&partnerID=8YFLogxK
U2 - 10.1016/j.marenvres.2008.06.001
DO - 10.1016/j.marenvres.2008.06.001
M3 - Article
C2 - 18657315
AN - SCOPUS:48149110132
SN - 0141-1136
VL - 66
SP - 378
EP - 393
JO - Marine Environmental Research
JF - Marine Environmental Research
IS - 3
ER -