Abstract
Abstract The use of ignited lake sediments rich in organic matter for monitoring S and heavy metal pollution was studied. In 1990,140 lake sediment samples were collected from four test areas in Finland and analysed, together with samples collected from the same sites 8–10 a earlier. In the Siilinjarvi test area which is exposed to strong SO 2 emissions, the concentrations of all heavy metals studied had increased. The median of the S values increased by 121%. The concentrations of Mn (84%), Pb (68%) and Ba (57%) also rose markedly. The test areas located in a background region of low pollution showed no systematic increase in concentration. Lake sediment samples whose organic content is dominantly in the range of 10–70% LOI form the most effective sample media. The monitoring should always be based on several samples (here 23–37 samples/100 km 2 ). Mixed lake sediments taken from the upper part of the sediment layer can be used in the pollution monitoring, but only rough conclusions can be drawn from the concentration variation.
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