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von der Ohe, Peter C.

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Peter C.
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2017 - 20194
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Enddatum: 2019 × Anfangsdatum: 2017 ×

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    Prediction of acute toxicity of emerging contaminants on the water flea daphnia magna by ant colony optimization
    (2017) Aalizadeh, Reza; Thomaidis, Nikolaos S.; von der Ohe, Peter C.
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    Recommendations for reducing micropollutants in waters
    (2018) Ahting, Maren; Brauer, Frank; Duffek, Anja; Ebert, Ina; Eckhardt, Alexander; Hassold, Enken; Helmecke, Manuela; Kirst, Ingo; Krause, Bernd; Lepom, Peter; Leuthold, Sandra; Mathan, Cindy; Mohaupt, Volker; Moltmann, Johann F.; Müller, Alexandra; Nöh, Ingrid; Pickl, Christina; Pirntke, Ulrike; Pohl, Korinna; Rechenberg, Jörg; Suhr, Michael; Thierbach, Claudia; Tietjen, Lars; von der Ohe, Peter C.; Winde, Christine; Deutschland. Umweltbundesamt
    Residues of medicinal products, pesticides, biozides and other chemicals can adversely affect the environment and human health already in low concentrations. These micropollutants are increasingly detected in our waters not least due to improved analytics. Precautionary measures are needed to prevent future stresses on our waterbodies. Therefore, the German Environment Agency (⁠UBA⁠) has analysed entry pathways, named critical substance characteristics and proposed a combination of measures consisting of measures at the source, in use and for wastewater treatment serving the objective of comprehensive water protection.
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    Occurrence and potential environmental risk of surfactants and their transformation products discharged by wastewater treatment plants
    (2019) Freeling, Finnian; Alygizakis, Nikiforos A.; von der Ohe, Peter C.
    Seven-day composite effluent samples from a German monitoring campaign including 33 conventional wastewater treatment plants (WWTP) were analyzed for linear alkylbenzene sulfonates (LAS) and alkyl ethoxysulfates (AES) and were screened by wide-scope suspect screening for 1564 surfactants and their transformation products (TPs) by UHPLC-ESI-QTOF-MS. Corresponding seven-day composite influent samples of selected WWTPs showed high influent concentrations as well as very high removal rates for LAS and AES. However, average total LAS and AES effluent concentrations were still 14.4 ng/L and 0.57 ng/L, respectively. The LAS-byproducts di-alkyl tetralin sulfonates (DATSs), the TPs sulfophenyl alkyl carboxylic acids (SPACs) and sulfo-tetralin alkyl carboxylic acids (STACs) reached maximum effluent concentrations of 19 ng/L, 17 ng/L and 5.3 ng/L, respectively. In many cases the sum of the concentration of all LAS-related byproducts and TPs surpassed the concentration of the precursors. High concentrations of up to 7.4 ng/L were found for 41 polyethylenoglycol homologs. Quantified surfactants and their TPs and by-products together accounted for concentrations up to 82 ng/L in WWTP effluents. To determine the risk of individual surfactants and their mixtures, single homologs were grouped by a "weighted carbon number approach" to derive normalized Predicted No-Effect Concentrations (PNEC), based on experimental ecotoxicity data from existing risk assessments, complemented by suitable Quantitative Structure-Activity Relationships (QSAR) predictions. Predicted Environmental Concentrations (PEC) were derived by dividing effluent concentrations of surfactants by local dilution factors. Risks for all analyzed surfactants were below the commonly accepted PEC/PNEC ratio of 1 for single compounds, while contributions to mixture toxicity effects from background levels of LAS and DATS cannot be excluded. Maximum LAS concentrations exceeded half of its PNEC, which may trigger country-wide screening to investigate potential environmental risks. © 2019 Elsevier B.V. All rights reserved.