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Metallkoncentrationer i sediment: Jämförelse mellan en fjällsjö och sjöar påverkad av gruvdrift
Umeå University, Faculty of Science and Technology, Department of Ecology and Environmental Sciences.
2012 (Swedish)Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
Abstract [en]

Metal concentration (Pb,Cu, Zn and As) in alpine lake sediments in comparison to sediment affected by sulfidemining

Many companies are prospecting for sulfide minerals in northern Sweden and mining activities in this area are likely to increase within the near future. The aim of this report was to estimate to what extent the metal concentration in lake sediments are expected to be altered by mining activities, by comparing the sediment concentrations in a pristine alpine lake sediment with that of sediment deposited in lakes near sulfide mines. Pristine lake sediments was collected from Lake Vuolep Silbbajávrre using a HTH sediment corer and analyzed using the X-ray fluorescence (XRF) while published metal concentrations from six mining lakes were used as a reference for the geochemical conditions in sulfide mining lakes. I found that sediment concentrations were typically hundred to thousand times higher in mining lakes compare to that in Vuolep Silbbajávrre. My results suggest that the metal loading in alpine lakes is expected to increase when sulfide mines are opening in Swedish sub-arctic alpine regions. The increase was especially high for As and Zn that showed the highest enrichments in the mining lakes in comparison to the alpine lake sediment. Higher concentrations of the metals are likely to have negative consequences for the benthic fauna having the sediment as habitat, considering that concentrations in the mining lakes sometimes exceed levels where negative biotic effects are expected. If the mineral exploration becomes a reality and new sulfide mines are opened in the Swedish alpine region, it will most likely result in a considerably increase in metal concentrations in nearby lakes.

Place, publisher, year, edition, pages
Keyword [en]
sulfide minerals, lake sediment, X-ray fluorescence, Swedish mountains, mining activities
National Category
Natural Sciences
URN: urn:nbn:se:umu:diva-58979OAI: diva2:550477
Subject / course
Examensarbete i miljö och hälsoskydd
Educational program
Bachelor of Science in Environmental Health
Life Earth Science
Available from: 2012-09-07 Created: 2012-09-07 Last updated: 2012-09-07Bibliographically approved

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