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Research article2001Peer reviewedOpen access

Sediment Evidence of Early Eutrophication and Heavy Metal Pollution of Lake Mälaren, Central Sweden

Renberg, Ingemar; Bindler, Richard, Bradshaw, Emily; et al.

Abstract

Lake Mälaren is the water supply and recreation area for more than 1 million people in central Sweden and subject to considerable environmental concern. To establish background data for assessments of contemporary levels of trophy and heavy metal pollution, sediment cores from the lake were analyzed. Diatom–inferred lake–water phosphorus concentrations suggest that pre-20th century nutrient levels in Södra Björkfjärden, a basin in the eastern part of Mälaren, were higher (c. 10–20 µg TP L–1) than previously assumed (c. 6 µg TP L–1). Stable lead isotope and lead concentration analyses from 3 basins (S. Björkfjärden, Gisselfjärden and Asköfjärden) show that the lake was polluted in the 19th century and earlier from extensive metal production and processing in the catchment, particularly in the Bergslagen region. The lake has experienced a substantial improvement of the lead pollution situation in the 20th century following closure of the mining and metal industry. The lead pollution from the old mining industry was large compared to late-20th century pollution from car emissions, burning of fossil fuels and modern industries.

Published in

AMBIO: A Journal of the Human Environment
2001, Volume: 30, number: 8, pages: 496-502

      SLU Authors

    • Emteryd, Ove

      • Department of Forest Ecology, Swedish University of Agricultural Sciences

    UKÄ Subject classification

    Environmental Sciences
    Oceanography, Hydrology, Water Resources

    Publication identifier

    DOI: https://doi.org/10.1579/0044-7447-30.8.496

    Permanent link to this page (URI)

    https://res.slu.se/id/publ/131605