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Natural formation of chlorinated phenols, dibenzo-P-dioxins and dibenzofurans in soil of a douglas fir forest

Funded under: FP5


The natural formation of 4-MCP, 24/25- and 26-DCP, and 245-TrCP was detected in four selected areas of a rural Douglas fir forest where the humic layer was spiked in situ with a solution of Na37Cl and covered by an enclosure, after one year of incubation. Chlorinated phenols (CP) can be formed naturally from organic matter and inorganic chloride by either de novo synthesis or chloroperoxidase (CPO)-catalyzed chlorination. This study did not reveal which source, natural or anthropogenic, caused the observed concentrations.

Some twenty chlorinated dibenzo-p-dioxins and dibenzofurans (CDD/F) were found to be formed naturally in soil of the Douglas fir forest; the formation of three 2, 3, 7, 8-substituted congeners, 2378-TeCDD, 12378-PeCDD and 123789-HxCDD deserves special attention. A formation mechanism has been proposed which starts from naturally formed CP congeners and which probably involves peroxidase mediation. Chlorination of CDD/F congeners by the CPO-mediated reaction cannot be excluded also to occur, but seems to be less likely due to the absence of several predicted congeners. .

Additional information

Authors: HOEKSTRA E J, TNO Environment, Energy and Process Development, Apeldoorn (NL);DE WEERD H, TNO Environment, Energy and Process Development, Apeldoorn (NL);DE LEER E W B, NMi Van Swinden Laboratory, Delft (NL);BRINKMAN U A T, Free University, Department of Analytical Chemistry, Amsterdam (NL)
Bibliographic Reference: Paper presented: DIOXIN 2000 Conference, Monterey, California (US) 14-17 August 2000
Availability: Available from European Commission, Joint Research Centre, Ispra (IT)
Record Number: 200012282 / Last updated on: 2000-08-10
Original language: en
Available languages: en
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