title: DDT-related compounds bound to the nonextractable particulate matter in sediments of the Teltow Canal, Germany.
abstract: Sediment samples of the Teltow Canal (Berlin, Germany) were analyzed with respect to extractable and nonextractable organic compounds. The study focused on the identification and quantitation of bound 2,2-bis(chlorophenyl)-1,1,1-trichlorethane (DDT) residues in order to obtain further information about the fate of DDT-derived compounds within the particulate matter of the aquatic environment. Various chemical degradation techniques and a complementary online pyrolysis-GC/MS method were applied to the pre-extracted sediment residues. Generally, the distribution of the bound DDT-related compounds was found to differ distinctly from the substances distribution within the extractable fraction. The main metabolite of the anaerobic degradation pathway (2,2-bis(chlorophenyl)-1,1-dichlorethane, DDD) is most abundant in the sediment extracts but occurred only in insignificant concentrations in the degradation products of all procedures applied. The most abundant DDT-metabolites released after the degradation procedures were 4,4'-DBP, 4,4'-DDA, and 4,4'-DDM. In addition, 4,4'-DDM was detected at rather high concentrations by pyrolytic analysis. The results imply a weak association to the nonextractable particulate matter based on noncovalent interactions for the observed DDT-related contaminants. The release of these compounds was initiated by the modification and degradation of the organic macromolecular matrix as well as of the inorganic material. Furthermore, numerous methoxychlor-related compounds were detected not only in the extracts but also in parts of the hydrolysis products.
authors.affiliation: Institute of Geology and Chemistry of Petroleum and Coal, Aachen University of Technology, Lochnerstrasse 4-20, D-52056 Aachen, Germany. schwarzbauer@lek.rwth-aachen.de
authors.forename: Jan
authors.initials: J
authors.lastname: Schwarzbauer
authors.forename: Mathias
authors.initials: M
authors.lastname: Ricking
authors.forename: Ralf
authors.initials: R
authors.lastname: Littke
mesh_terms: D003634:DDT / Q000032:analysis* / Q000737:chemistry; D004784:Environmental Monitoring; D019015:Geologic Sediments / Q000737:chemistry*; D005858:Germany; D006868:Hydrolysis; D007306:Insecticides / Q000032:analysis* / Q000737:chemistry; D014874:Water Pollutants, Chemical / Q000032:analysis*
chemical_list: D007306:Insecticides; D014874:Water Pollutants, Chemical; D003634:DDT