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Veröffentlichung Identification and Quantification of Microplastic in Sewage Systems by TED-GC-MS(2019) Altmann, Korinna; Goedecke, Caroline; Bannick, Claus GerhardThe number of publications reporting the amount of microplastic (MP) all over the world increased rapidly. Methods used so far are very time consuming and not able to provide information on total contents. As harmonised sampling, sample preparation and analysis strategies are missing different studies can hardly be compared and quantitative data, including identification and mass contents of the polymers found, are missing. This leads to a lack of comprehensive understanding of MP occurrence, source and entry pathways into the environment. We developed a method, Thermal Extraction/Desorption-Gaschromatography-Massspectrometry, as a fast screening method for MP analysis. Solid residues of water samples are heated up to 600 C under a N2 atmosphere without any sample preparation. The collected decomposition gases are separated in a gas chromatography system and detected in a mass spectrometer. Mass contents of the identified polymers can be calculated. In this presentation we will show first results from the influent of the wastewater treatment plant Kaiserslautern (Germany) and its combined sewage system as possibly entry pathway. In order to determine the relevance of wastewater split streams analysis of grey water will be conducted. Samples are fractionally filtered by a sieve cascade with mesh sizes of 500, 100, 50 Ìm. Quelle: https://opus4.kobv.de/Veröffentlichung Determination of microplastic mass content by thermal extraction desorption gas chromatography-mass spectrometry(2021) Wiesner, Yosri; Altmann, Korinna; Braun, UlrikeThe scientific and practical challenge of detecting microplastics (MPs) in the environment in a targeted and rapid manner is solved by innovative coupling of thermogravimetric analysis with mass spectrometric methods. Fast identification and quantitative determination of most thermoplastic polymers and elastomers is possible by using thermal extraction desorption gas chromatography-mass spectrometry (TED-GC-MS). © AuthorsVeröffentlichung Untersuchungsverfahren von Mikroplastikgehalten im Wasser für Praxis und Wissenschaft(2021) Altmann, Korinna; Braun, Ulrike; Heller, ClaudiaZielsetzung des vom Bundesministerium für Bildung und Forschung geförderten Projektes RUSEKU (Repräsentative Untersuchungsstrategien für ein integratives Systemverständnis von spezifischen Einträgen von Kunststoffen in die Umwelt) war es, repräsentative Untersuchungsstrategien für die Detektion von Mikroplastik mittels TED GC/MS in wässerigen Medien zu ermitteln. Dabei wurden verschiedene Probenahmekonzepte und -verfahren für unterschiedliche Fallgestaltungen und Fragestellungen untersucht, sowie neue Filtersysteme entwickelt. Bei der Detektion der Partikel lag der Fokus auf der Anwendung und Weiterentwicklung der ThermoExtraktion/Desorption-Gaschromatographie-Massenspektrometrie (TED-GC/MS) zur Bestimmung von Mikroplastikgehalten. Anwendung fanden die Methoden bei der Beprobung von Flaschenwasser, Waschmaschinenabläufen, dem urbanen Abwassersystem der Stadt Kaiserslautern, sowie in Oberflächengewässern. © AuthorsVeröffentlichung Smart filters for the analysis of microplastic in beverages filled in plastic bottles(2021) Braun, Ulrike; Altmann, Korinna; Herper, DominikThe occurrence of microplastic (MP) in food products, such as beverages in plastic bottles, is of high public concern. Existing analytical methods focus on the determination of particle numbers, requiring elaborate sampling tools, laboratory infrastructure and generally time-consuming imaging detection methods. A comprehensive routine analysis of MP in food products is still not possible. In the present work, we present the development of a smart filter crucible as sampling and detection tool. After filtration and drying of the filtered-off solids, a direct determination of the MP mass content from the crucible sample can be done by thermal extraction desorption gas chromatography mass spectroscopy (TED-GC/MS). The new filter crucible allows a filtration of MP down to particle sizes of 5 (micro)m. We determined MP contents below 0.01 (micro)g/L up to 2 (micro)g/L, depending on beverages bottle type. This may be directly related to the bottle type, especially the quality of the plastic material of the screw cap. Dependent on the plastic material, particle formation increases due to opening and closing operations during the use phase. However, we have also found that some individual determinations of samples were subjected to high errors due to random events. A conclusive quantitative evaluation of the products is therefore not possible at present. © Taylor&Francis OnlineVeröffentlichung A new concept for the ecotoxicological assessment of plastics under consideration of aging processes(2023) Kittner, Maria; Isernhinke, Lisa; Altmann, Korinna; Braun, Ulrike; Lukas, MarcusMicroplastics are widely distributed in aquatic and terrestrial environments, but up tonow less is known about (eco)toxicological impacts under realistic conditions. Researchso far has focused mainly on impacts on organisms by fresh, single-origin plasticfragments or beads. However, plastics found in the environment are complex incomposition, this means different polymer types and sources, with and withoutadditives and in all stages of age, and therefore, in a more or less advanced stage ofdegradation. For oxidized degradation products that might be released from plasticmaterials during aging, there is a lack of information on potentially adverse effects onaquatic biota. The latter is of particular interest as oxidized degradation products mightbecome more water soluble due to higher polarity and are more bioavailable, therefore.The present study focused on plastic leachates of polystyrene (PS) and polylactic acid(PLA), which were derived from alternating stress by hydrolysis and ultraviolet (UV)radiation-representing a realistic scenario in the environment. Test specimens of PS,PLA, or a PLA/PS layer (each 50%) were alternately exposed to UV radiation for 5 daysfollowed by hydrolysis for 2 days, for several weeks alternating. Ecotoxicological effectsof the storage water (artificial freshwater) of the test specimens and additionally, in asecond experimental setup, the effects of five potential polymer degradation productswere detected by 72 h algae growth inhibition tests withDesmodesmus subspicatus.Results clearly indicate inhibitory effects on algae growth by contaminants in thestorage water of stressed plastics with increasing growth inhibition of proceedinghydrolysis and UV stress times. Different polymers caused variable inhibitions of algaegrowth with stronger inhibitions by PS and less effects by PLA and the mixed layer ofboth. Moreover, not microplastic particles but the resulting dissolved degradationproducts after aging caused theecotoxicological effectsââą Ìwith strong effects by theoxidized degradation products. The existing data highlight the relevance of plastic agingas a framework for microplastic ecotoxicity evaluation and allow a proof of concept. © 2023 The Authors.Veröffentlichung Garment ageing in a Laundry care process under household-like conditions(2023) Heller, Claudia; Altmann, Korinna; Bannick, Claus Gerhard; Braun, Ulrike; Kerndorff, AlexanderThis study reflects typical consumer textile washing behaviour while taking into account existing standards in the household appliance and garment industries. Two garments were washed repeatedly with artificial dirt and detergent 30 times. The collected washing water was separated using fractional filtration. Textile physical tests were used to follow property changes of the garments, the microplastic release is determined using thermoextraction/desorbtionâ€Ìgas chromatography/mass spectrometry and the total organic carbon was measured as a sum parameter for the organic bonded carbon. This article shows the importance of a reality-based approach when investigating microplastics of textile origin in the laundry care process. Deposits of detergent and dirt on the textiles were detected. The total mass of sieve residues was much higher than the release of synthetic polymers. The cotton content of the garments causes a much higher fibre release than synthetic fibres. Both will lead to false results by purely gravimetric analysis because nonpolymer fibres will be included microplastic mass. The results cannot be generalised only by the main polymer type, knowledge of the textile construction must be included for final evaluation. © 2023 Wiley-VCH GmbH.Veröffentlichung Identification of microplastic pathways within a typical European urban wastewater(2022) Altmann, Korinna; Goedecke, Caroline; Bannick, Claus-Gerhard; Braun, Ulriken recent years, thermoextraction/desorption-gas chromatography/mass spec-trometry (TED-GC/MS) has been developed as a rapid detection method for thedetermination of microplastics (MP) mass contents in numerous environmen-tally relevant matrices and, in particular, for the measurement of polymers inwater samples without time-consuming sample preparation. The TED-GC/MSmethod was applied to investigate a typical European municipal wastewatersystem for possible MP masses. Such investigations are important in view of therecent revision of the Urban WastewaterTreatment Directive. Four differentrepresentative sampling sites were selected: greywater (domestic wastewaterwithout toilet), combined sewer, andinfluent and effluent of a wastewatertreatment plant (WWTP). All samples were collected by fractional filtration.Filtration was carried out over mesh sizes of 500, 100, 50, and in some cases,5 ÎÌm. Polyethylene (PE), polypropylene (PP), and polystyrene (PS) weredetected in all samples, with the PE fraction dominating in all cases. Styrene-butadiene rubber which serves as an indication of tire abrasion, was only foundin the influent of the WWTP. The highest MP mass contents were found in thecombined sewer, so MP can become a source of pollution during heavy rainevents when the capacity limits of the effluent are reached, and the pollutedeffluent is released uncontrolled into the environment. Based on the studies,MP retention from the WWTP could be estimated to be approximately 96%.Few trends in polymer type or mass contents were detected within the differentfractions of the samples or when comparing samples to each other. © 2023 The Authors.Applied Researchpublished by Wiley-VCH GmbH.