Search Results - "Kümmel, Steffen"

Continuous-Flow Stable Sulfur Isotope Analysis of Organic and Inorganic Compounds by EA-MC-ICPMS by Horst, Axel, Gehre, Matthias, Fahle, Marcus, Kümmel, Steffen

“…Elemental analysis (EA) coupled to isotope ratio mass spectrometry (IRMS) is a well-established method to derive stable isotope ratios of sulfur (34S/32S)…”
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Soil from a Hexachlorocyclohexane Contaminated Field Site Inoculates Wheat in a Pot Experiment to Facilitate the Microbial Transformation of β‑Hexachlorocyclohexane Examined by Compound-Specific Isotope Analysis by Liu, Xiao, Li, Wang, Kümmel, Steffen, Merbach, Ines, Sood, Utkarsh, Gupta, Vipin, Lal, Rup, Richnow, Hans H

“…β-Hexachlorocyclohexane (β-HCH) is a remnant from former HCH pesticide production. Its removal from the environment gained attention in the last few years…”
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Humic Substance Photosensitized Degradation of Phthalate Esters Characterized by 2H and 13C Isotope Fractionation by Min, Ning, Yao, Jun, Li, Hao, Chen, Zhihui, Pang, Wancheng, Zhu, Junjie, Kümmel, Steffen, Schaefer, Thomas, Herrmann, Hartmut, Richnow, Hans Hermann

“…The photosensitized transformation of organic chemicals is an important degradation mechanism in natural surface waters, aerosols, and water films on surfaces…”
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Uptake and Transformation of Hexachlorocyclohexane Isomers (HCHs) in Tree Growth Rings at a Contaminated Field Site by Liu, Xiao, Kümmel, Steffen, Trapp, Stefan, Richnow, Hans Hermann

“…The potential transformation of hexachlorocyclohexane isomers (HCHs) within tree trunks could have a significant impact on the use of phytoscreening. However,…”
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Tracking the transformation of persistent organic pollutants in food webs using multi element isotope and enantiomer fractionation by Liu, Xiao, Kümmel, Steffen, Wu, Langping, Richnow, Hans H.

“…In order to track the transformation of persistent organic pollutants (POPs) in food webs, field experiments were conducted at two sites using stable isotope…”
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Determination of Stable Hydrogen Isotopic Composition and Isotope Enrichment Factor at Low Hydrogen Concentration by Liu, Xiao, Wu, Langping, Kümmel, Steffen, Gehre, Matthias, Richnow, Hans Hermann

“…Determination of stable hydrogen isotopic compositions (δ2H) is currently challenged to achieve a high detection limit for reaching the linear range where δ2H…”
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Uptake and Metabolization of HCH Isomers in Trees Examined over an Annual Growth Period by Compound-Specific Isotope Analysis and Enantiomer Fractionation by Liu, Xiao, Yang, Ahyung, Kümmel, Steffen, Richnow, Hans H.

“…To understand the role of plants for natural attenuation, a field study was conducted to characterize the fate of HCH in trees over an annual growth period…”
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Compound-Specific Isotope Analysis and Enantiomer Fractionation to Characterize the Transformation of Hexachlorocyclohexane Isomers in a Soil–Wheat Pot System by Liu, Xiao, Wu, Langping, Kümmel, Steffen, Merbach, Ines, Lal, Rup, Richnow, Hans H

“…The uptake by plants from soil is one of the first steps for hexachlorocyclohexane (HCH) isomers to enter the food web. However, the HCH transformation…”
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Characterization of Hexachlorocyclohexane Isomer Dehydrochlorination by LinA1 and LinA2 Using Multi-element Compound-Specific Stable Isotope Analysis by Liu, Yaqing, Fu, Juan, Wu, Langping, Kümmel, Steffen, Nijenhuis, Ivonne, Richnow, Hans H.

“…Dehydrochlorination is one of the main (thus far discovered) processes for aerobic microbial transformation of hexachlorocyclohexane (HCH) which is mainly…”
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Direct Phototransformation of Sulfamethoxazole Characterized by Four-Dimensional Element Compound Specific Isotope Analysis by Liu, Xiao, Akay, Caglar, Köpke, Jimmy, Kümmel, Steffen, Richnow, Hans Hermann, Imfeld, Gwenaël

“…The antibiotic sulfamethoxazole (SMX) undergoes direct phototransformation by sunlight, constituting a notable dissipation process in the environment. SMX…”
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Compound-Specific Hydrogen Isotope Analysis of Heteroatom-Bearing Compounds via Gas Chromatography–Chromium-Based High-Temperature Conversion (Cr/HTC)–Isotope Ratio Mass Spectrometry by Renpenning, Julian, Kümmel, Steffen, Hitzfeld, Kristina L, Schimmelmann, Arndt, Gehre, Matthias

“…The traditional high-temperature conversion (HTC) approach toward compound-specific stable isotope analysis (CSIA) of hydrogen for heteroatom-bearing (i.e., N,…”
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Simultaneous Compound-Specific Analysis of δ33S and δ34S in Organic Compounds by GC-MC-ICPMS Using Medium- and Low-Mass-Resolution Modes by Kümmel, Steffen, Horst, Axel, Gelman, Faina, Strauss, Harald, Richnow, Hans H, Gehre, Matthias

“…Compound-specific isotope analysis of sulfur (δ34S-CSIA) in organic compounds was established in the last decade employing gas chromatography connected to…”
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The deep-subsurface sulfate reducer Desulfotomaculum kuznetsovii employs two methanol-degrading pathways by Sousa, Diana Zita Machado, Visser, Michael, van Gelder, Antonie H., Boeren, Sjef, Pieterse, Mervin M., Pinkse, Martijn W. H., Verhaert, Peter D. E. M., Vogt, Carsten, Franke, Steffi, Kümmel,Steffen, Stams, Alfons Johannes Maria

“…Methanol is generally metabolized through a pathway initiated by a cobalamine-containing methanol methyltransferase by anaerobic methylotrophs (such as…”
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Dual C and Cl compound-specific isotope analysis and metagenomic insights into the degradation of the pesticide methoxychlor by Vinyes-Nadal, Martí, Kümmel, Steffen, Espín, Yolanda, Gómez-Alday, Juan José, Gehre, Matthias, Otero, Neus, Torrentó, Clara

“…This study investigates the use of multi-element compound-specific isotope analysis (ME-CSIA) to monitor degradation processes of methoxychlor, a persistent…”
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Photosynthesis-driven methane production in oxic lake water as an important contributor to methane emission by Günthel, Marco, Klawonn, Isabell, Woodhouse, Jason, Bižic, Mina, Ionescu, Danny, Ganzert, Lars, Kümmel, Steffen, Nijenhuis, Ivonne, Zoccarato, Luca, Grossart, Hans-Peter, Tang, Kam W.

“…Recent discovery of methane (CH₄) production in oxic waters challenges the conventional understanding of strict anoxic requirement for biological CH₄…”
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Hydrogen isotope labeling unravels origin of soil-bound organic contaminant residues in biodegradability testing by Lennartz, Sophie, Byrne, Harriet A., Kümmel, Steffen, Krauss, Martin, Nowak, Karolina M.

“…Biodegradability testing in soil helps to identify safe synthetic organic chemicals but is still obscured by the formation of soil-bound ‘non-extractable’…”
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Requirements for Chromium Reactors for Use in the Determination of H Isotopes in Compound-Specific Stable Isotope Analysis of Chlorinated Compounds by Gilevska, Tetyana, Sullivan Ojeda, Ann, Renpenning, Julian, Kümmel, Steffen, Gehre, Matthias, Nijenhuis, Ivonne, Sherwood Lollar, Barbara

“…There is a strong need for careful quality control in hydrogen compound-specific stable isotope analysis (CSIA) of halogenated compounds. This arises in part…”
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Back flux during anaerobic oxidation of butane support archaea-mediated alkanogenesis by Chen, Song-Can, Chen, Sheng, Musat, Niculina, Kümmel, Steffen, Ji, Jiaheng, Lund, Marie Braad, Gilbert, Alexis, Lechtenfeld, Oliver J., Richnow, Hans-Hermann, Musat, Florin

“…Microbial formation and oxidation of volatile alkanes in anoxic environments significantly impacts biogeochemical cycles on Earth. The discovery of archaea…”
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Hydrogen Isotope Fractionation As a Tool to Identify Aerobic and Anaerobic PAH Biodegradation by Kümmel, Steffen, Starke, Robert, Chen, Gao, Musat, Florin, Richnow, Hans H, Vogt, Carsten

“…Aerobic and anaerobic polycyclic aromatic hydrocarbon (PAH) biodegradation was characterized by compound specific stable isotope analysis (CSIA) of the carbon…”
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Tracking deuterium uptake in hydroponically grown maize roots using correlative helium ion microscopy and Raman micro-spectroscopy by Davoudpour, Yalda, Kümmel, Steffen, Musat, Niculina, Richnow, Hans Hermann, Schmidt, Matthias

“…Investigations into the growth and self-organization of plant roots is subject to fundamental and applied research in various areas such as botany,…”
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