Numéro |
J. Phys. IV France
Volume 107, May 2003
|
|
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Page(s) | 1349 - 1351 | |
DOI | https://doi.org/10.1051/jp4:20030551 |
J. Phys. IV France 107 (2003) 1349
DOI: 10.1051/jp4:20030551
Influence of liming on metal burdens in lake sediments
T. Wällstedt and H. Borglnstitute of Applied Environmental Research, Stockholm University, 10691 Stockholm, Sweden
Abstract
During the last three decades, liming has been used as a large-scale treatment of acidified lakes in Sweden. Since the
mobility of many metals decrease with increasing pH of the water, application of lime directly into the lake might increase
metal deposition to the sediments. The aim of this project is to investigate the difference in metal deposition to the sediments
in
limed and non-limed lakes. Surface sediments from 11 limed and 10 non-limed lakes were collected during the summers of
1998 and 1999 and analysed for a number of elements (Al, As, Ca, Cd, Co, Cr, Cu, Fe, Hg, Mn, Ni, P, Pb, V and Zn). With
reference to treatment method or acidification status, the lakes were divided into four sub-groups and the weighted mean areal
metal burdens were statistically compared. Generally, the highest metal burdens were found in the surface limed group and
the
lowest burdens were found in the acidified reference group. Potential factors influencing the metal deposition were also
evaluated by a multivariate analysis (PLS). The PLS indicated that liming is an important factor for the deposition of metals
to
lake sediments.
© EDP Sciences 2003