DDT-Related Compounds Bound to the Nonextractable Particulate Matter in Sediments of the Teltow Canal, Germany

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• 作者：Jan Schwarzbauer ; Mathias Ricking ; and Ralf Littke
• 刊名：Environmental Science & Technology
• 出版年：2003
• 出版时间：February 1, 2003
• 年：2003
• 卷：37
• 期：3
• 页码：488 - 495
• 全文大小：223K
• 年卷期：v.37,no.3(February 1, 2003)
• ISSN：1520-5851

文摘

Sediment samples of the Teltow Canal (Berlin, Germany)were analyzed with respect to extractable and nonextractableorganic compounds. The study focused on the identificationand quantitation of bound 2,2-bis(chlorophenyl)-1,1,1-trichlorethane (DDT) residues in order to obtain furtherinformation about the fate of DDT-derived compounds withinthe particulate matter of the aquatic environment. Variouschemical degradation techniques and a complementary on-line pyrolysis-GC/MS method were applied to the pre-extracted sediment residues. Generally, the distribution ofthe bound DDT-related compounds was found to differdistinctly from the substances distribution within theextractable fraction. The main metabolite of the anaerobicdegradation pathway (2,2-bis(chlorophenyl)-1,1-dichlorethane, DDD) is most abundant in the sediment extracts butoccurred only in insignificant concentrations in thedegradation products of all procedures applied. The mostabundant DDT-metabolites released after the degradationprocedures were 4,4'-DBP, 4,4'-DDA, and 4,4'-DDM. Inaddition, 4,4'-DDM was detected at rather high concentrationsby pyrolytic analysis. The results imply a weak associationto the nonextractable particulate matter based onnoncovalent interactions for the observed DDT-relatedcontaminants. The release of these compounds was initiatedby the modification and degradation of the organicmacromolecular matrix as well as of the inorganic material.Furthermore, numerous methoxychlor-related compoundswere detected not only in the extracts but also in parts ofthe hydrolysis products.