Analysis of non-extractable DDT-related compounds in riverine sediments of the Teltow Canal, Berlin, by pyrolysis and thermochemolysis.
Eighteen pre-extracted samples derived from a subaquatic riverine sediment core taken from the Teltow Canal, Berlin (Germany), were treated by off-line TMAH-thermochemolysis and subsequently analyzed by GC-MS to investigate release and thermodegradation of non-extractable anthropogenic organic compounds (bound residues). Furthermore, six selected samples from the lower core section were additionally treated by off-line pyrolysis. Due to former investigations of the extractable fraction of Teltow Canal sediments, high amounts of compounds structurally related to the pesticide DDT (1,1,1-trichloro-2,2-bis(4-chlorophenyl)ethane) were anticipated within the nonextractable fraction. It has been shown that DDT-related bound residues can be gathered by pyrolysis and TMAH-thermochemolysis. Among other compounds, the experiments revealed two DDT-related degradation products (DDPU (3,3-bis(4-chlorphenyl)-1-propene) and DDPS (1,1-bis(4-chlorophenyl)propane)) which were detected for the first time in the environment. The latter compounds may represent formerly unknown metabolites or hints for the existence of carbon-carbon incorporated DDT-metabolites. Both methods tend to produce artifacts which complicate the interpretation of the results. With more knowledge on mechanisms occurring during application of pyrolysis and thermochemolysis, both methods can serve as valuable tools for analyzing bound residues in sediments.
Kronimus
Alexander
A
Institute of Geology and Geochemistry of Petroleum and Coal, RWTH Aachen University, Germany.
Schwarzbauer
Jan
J
Ricking
Mathias
M
D001604:Berlin; D003634:DDT / Q000737:chemistry*; D004784:Environmental Monitoring; D008401:Gas Chromatography-Mass Spectrometry; D019015:Geologic Sediments / Q000032:analysis*; D006358:Hot Temperature; D007220:Industrial Waste; D000644:Quaternary Ammonium Compounds / Q000737:chemistry*; D045483:Rivers; D014874:Water Pollutants, Chemical / Q000032:analysis / Q000737:chemistry*
D007220:Industrial Waste; D000644:Quaternary Ammonium Compounds; D014874:Water Pollutants, Chemical; D003634:DDT; C027917:tetramethylammonium