Occurrence in Sediments and Biosludges

In a study of dated sediment layers of Central Finland 236 CYMS and 236CYMD were measured and found most abundant in the near recipients of bleaching pulp mills. They were measured as significant contaminants with decreasing gradient in bottoms of the recipient watercourse lakes tens of kilometers downstream from the mill discharge points [24]. An example of the contents is shown in Fig. 1. 

Contents of surface sediments showed a slight decreasing gradient in a marine recipient at the west coast of Finland but increasing gradient in a fastflowing recipient river in South-East Finland (Fig. 2). The latter virtual paradox was explained by deposition of pure particles from upstream [17,23]. 

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