Metals in small Norwegian lakes: Relation to atmospheric deposition of pollutants |
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| Authors: | E Steinnes A Henriksen |
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| Institution: | 1. Department of Chemistry, University of Trondheim, A.V.H., N-7055, Dragvoll, Norway
2. Norwegian Institute for Water Research, Blindern, P.O. Box 33, N-0313, Oslo 3, Norway
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| Abstract: | Water chemistry data from 165 lakes in Norway are discussed in relation to contribution from long-range transported air pollutants. Concentrations of lead and antimony in terrestrial mosses are used to express the relative contribution from long range transport to each lake. The contents of Al and Zn in lake water and of ‘excess’ SO4 in low Ca lakes show high correlations with the relative heavy metal deposition values from moss analysis. The ‘excess’ SO4 in low Ca lakes correlates strongly with Al and too a lesser extent with Mn and Fe. It is suggested that the lake water levels of Al and Mn, and even to some extent Fe, are significantly affected by acidic precipitation enhancing the leaching of these metals from mineral matter in soils and sediments. In the case of Zn, airborne supply to the lakes and their catchments appears to strongly affect the water content. |
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