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The samples of lake sediments are either the uppermost sediment (Richardvatn) or a sediment core (Ellasjøen). At Ellasjøen, 4 sediment cores were taken at the same station, one for each of the tasks, dating, organic pollutants, metals and organic carbon. The cores are divided into 1cm thick slices in the field and each of these was frozen immediately. Since the core contains material that fell to the bottom in different datable periods, it contains a natural archive of the pollution status and can be brought up and analysed whenever required.
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