Butyltins in Sediments of the St.Lawrence River

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Butyltins are organometallic compounds that have been used as biocides in antifouling paints for ship hulls; as fungicides, insecticides and wood preservation products; and as stabilizers in polyvinyl chloride since 1960. Butyltins can be measured in sediments in the form of tributyltin (TBT) and its degradation products, dibutyltin (DBT) and monobutyltin (MBT). Sediments in the three fluvial lakes and the fluvial section, with the exception of the Contrecoeur Islands sector, show little or no butyltin contamination. The Contrecoeur Islands sector is a special case; it has very high concentrations of butyltins. Sediments collected within the port (Port of Montreal) and navigation (channel and locks) infrastructure and in recreational activity areas such as marinas show much higher levels of butyltin contamination than in the river.

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  • Author: Government of Canada, Environment Canada
  • Language of Document: Separate English/French
  • Document Type: Fact sheet
  • Cat. No.: En14-111/2013E-PDF
  • ISBN: 978-1-100-22950-8
  • Size: 21.6 x 28 cm
  • Pages: 7
  • Year: 2014
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