68 research outputs found
Sediment contamination of an urban canalβa case study approach for an integrated assessment of organic sediment contamination
Purpose:
The pesticide DDT and its metabolites represent a contamination risk for the aquatic environment, especially the polar metabolite DDA. The study provides a quantitative assessment of long-term pollution risks from sedimentary DDT residues with a special focus on DDA. It presents an overview of the contamination range of different DDX compounds in the sediments of a canal in Berlin (Germany), resulting from a former industrial point source that has implications for drinking water resources in the nearby area. The comprehensive analysis scheme provides information on free accessible and potentially metabolized precursors also in the non-extractable residues. This allows a quantitative assessment of the DDA pollution potential derived from the sedimentary DDT residues.Materials and methods;
The area was investigated for fine-grained sediment by means of a geo-electric mapping. Twelve sediment cores were taken in four areas (three in each section). A wider range of precursor metabolites has been included due to their transformation potential to the polar metabolite DDA. The sediments were analysed quantitatively for extractable and easily releasable fractions by application of a variety of degradation techniques as well as a dispersion extraction procedure on the sediment samples. These extracts were fractionated and subsequently analysed by GC-MS.Results and discussion:
Concentrations were obtained for extractable and bound metabolites. Different scenarios for the calculation of the amount of contaminated sediment are displayed as a tool for contamination assessment. The formation potential of DDA as the water-soluble metabolite is presented. Several precursor metabolites, e.g. DDD and DDMS, extractable from the sediment organic matter, revealed a high potential for a long-term formation of DDA, especially in the easily releasable fraction (via hydrolysis) with a mean concentration of up to 11,000Β ΞΌgΒ gβ1 dry sediment. The resulting DDA contamination potential represents a significant pollution risk for the groundwater from a downstream waterworks area and by remobilisation into the whole ecosystem and adjacent rivers.Conclusions:
The application of the presented methods provides a tool for a quantitative assessment of the long-term release potential of DDA under different scenarios by a comprehensive analysis of contaminated sediments (and soils). This approach can be transferred to pollutants that are also characterized by a complex metabolism accompanied by bound residue formation.DF
Molecular markers of anthropogenic activity in Sediments of the Havel and Spree-Rivers (Germany)
The Effect of Environmental Processes on the Isomeric Composition of DDT-related Compounds
Occurrence and fate of organic pollutants incorporated into macromolecular organic matter of riverine sediments
Occurrence and fate of organic pollutants incorporated into macromolecular organic matter of riverine sediments
DDT-Metabolite im nichtextrahierbaren organischen Material von belasteten Sedimenten des Teltowkanals
ΠΠΈΠ°Π³Π½ΠΎΡΡΠΈΠΊΠ° ΠΏΠΎΠΏΠ΅ΡΠ΅ΡΠ½ΡΡ ΠΏΡΠΎΡΠΈΠ»Π΅ΠΉ ΡΠ»Π΅ΠΊΡΡΠΎΠ½Π½ΡΡ ΠΈ Π³Π°ΠΌΠΌΠ° ΠΏΡΡΠΊΠΎΠ² ΠΎΠΏΡΠΈΡΠ΅ΡΠΊΠΈΠΌΠΈ ΠΌΠ΅ΡΠΎΠ΄Π°ΠΌΠΈ: Π΄ΠΈΡΡΠ΅ΡΡΠ°ΡΠΈΡ Π½Π° ΡΠΎΠΈΡΠΊΠ°Π½ΠΈΠ΅ ΡΡΡΠ½ΠΎΠΉ ΡΡΠ΅ΠΏΠ΅Π½ΠΈ ΠΊΠ°Π½Π΄ΠΈΠ΄Π°ΡΠ° ΡΠΈΠ·ΠΈΠΊΠΎ-ΠΌΠ°ΡΠ΅ΠΌΠ°ΡΠΈΡΠ΅ΡΠΊΠΈΡ Π½Π°ΡΠΊ: ΡΠΏΠ΅Ρ. 01.04.20
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