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Storjuktan – Rekonstruktion av ett sekels kvicksilverbelastning.: En undersökning av kvicksilverkoncentrationer i daterat bottensediment.
Umeå University, Faculty of Science and Technology, Department of Ecology and Environmental Sciences.
2015 (Swedish)Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesisAlternative title
Storjuktan – A reconstruction of the mercury load of a century. : A study of mercury concentration in dated sediments. (English)
Abstract [en]

The aim of this study was to examine the current and historic mercury(Hg) load of the lake Storjuktan due to its recent exposure to a local potential source of Hg in form of the Sulphide mine Blaikengruvan(2006) and an earlier potential sources of Hg-load, the damming of the lake(1960s). Sediments were extracted using a HTH-sampler, freeze-dried, and analyzed for tot-Hg, LOI and activity of 210Pb and compared to samples extracted prior to the opening of the mine(2006). Constant initial concentration (CIC)-dating model was used for dating the samples. Low levels of Hg (100ng/g) were found throughout the lakes sediment. The highest levels of Hg(220ng/g) was detected at a depth of 4-5cm dating back to the mid 1970:s, suggesting that increased levels of atmospheric Hg rather than damming of the lake has caused the increase of Hg. No strong evidence for a release of Hg from the local mine was found. However an unexpected layer of anthropogenic sediment with low Hg-levels was found in close proximity to the metal enrichment plant, further supporting that the mine constituted a weak source of Hg. However, the anthropogenic sediment itself covered a large area (ca 22 ha) and its chemical composition calls for further investigation of its extent, properties and ecological impact in Lake Storjuktan.

Keywords: Mercury; Sediment; contamination; Damming; Sweden    

Place, publisher, year, edition, pages
2015. , 13 p.
National Category
Earth and Related Environmental Sciences
URN: urn:nbn:se:umu:diva-104224OAI: diva2:818477
Subject / course
Examensarbete i miljö och hälsoskydd
Educational program
Bachelor of Science in Environmental Health
2015-06-04, NC 250, Umeå, 16:00 (Swedish)
Available from: 2015-06-08 Created: 2015-06-08 Last updated: 2015-06-08Bibliographically approved

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