Fakultät für Chemie

Room
S05 V02 E25

Functions

  • Gruppe der akademischen Mitarbeiterinnen und Mitarbeiter, Prüfungsausschuss B.Sc./M.Sc.-Studiengang Water Science

  • Wissenschaftliche/r Mitarbeiter/in, Prof. Schmidt

The following publications are listed in the online university bibliography of the University of Duisburg-Essen. Further information may also be found on the person's personal web pages.

    Journal articles

  • Marks, Robert G.H.; Rockel, Sarah P.; Kerpen, Klaus; Somnitz, Holger; Martin, Philipp R.; Jochmann, Maik A.; Schmidt, Torsten C.
    Effects of pH-dependent speciation on the photolytic degradation mechanism of phosphonates
    In: Journal of Photochemistry and Photobiology A: Chemistry Vol. 448 (2024) 115327
  • Hesse, Tobias; Nachev, Milen; Khaliq, Shaista; Jochmann, Maik A.; Franke, Frederik; Scharsack, Jörn P.; Kurtz, Joachim; Sures, Bernd; Schmidt, Torsten C.
    A new technique to study nutrient flow in host-parasite systems by carbon stable isotope analysis of amino acids and glucose
    In: Scientific Reports Vol. 13 (2023) Nr. 1, 1054
  • Tintrop, Lucie K.; Salemi, Amir; Jochmann, Maik; Engewald, Werner R.; Schmidt, Torsten Claus
    Improving greenness and sustainability of standard analytical methods by microextraction techniques : A critical review
    In: Analytica Chimica Acta Vol. 1271 (2023) 341468
  • Tintrop, Lucie K.; Lieske-Overgrand, Jana R.; Wickneswaran, Kaliyani; Abis, Rukiyye; Brunstermann, Ruth; Jochmann, Maik; Schmidt, Torsten C.
    Isotope-labeling in situ derivatization and HS-SPME arrow GC–MS/MS for simultaneous determination of fatty acids and fatty acid methyl esters in aqueous matrices
    In: Analytical and Bioanalytical Chemistry Vol. 415 (2023) Nr. 26, pp. 6525 - 6536
  • Marks, Robert G.H.; Drees, Felix; Rockel, Sarah; Kerpen, Klaus; Jochmann, Maik A.; Schmidt, Torsten C.
    Mechanistic investigation of phosphonate photolysis in aqueous solution by simultaneous LC-IRMS and HRMS analysis
    In: Journal of Photochemistry and Photobiology A: Chemistry Vol. 439 (2023) 114582
  • Vos, Matthijs; Hering, Daniel; Gessner, Mark O.; Leese, Florian; Schäfer, Ralf B.; Tollrian, Ralph; Boenigk, Jens; Haase, Peter; Meckenstock, Rainer; Baikova, Daria; Bayat, Helena; Beermann, Arne; Beißer, Daniela; Beszteri, Bánk; Birk, Sebastian; Boden, Lisa; Brauer, Verena; Brauns, Mario; Buchner, Dominik; Burfeid-Castellanos, Andrea; David, Gwendoline; Deep, Aman; Doliwa, Annemie; Dunthorn, Micah; Enß, Julian; Escobar-Sierra, Camilo; Feld, Christian K.; Fohrer, Nicola; Grabner, Daniel; Hadziomerovic, Una; Jähnig, Sonja C.; Jochmann, Maik; Khaliq, Shaista; Kiesel, Jens; Kuppels, Annabel; Lampert, Kathrin P.; Le, T.T. Yen; Lorenz, Armin W.; Madariaga, Graciela Medina; Meyer, Benjamin; Pantel, Jelena H.; Pimentel, Iris Madge; Mayombo, Ntambwe Serge; Nguyen, Hong Hanh; Peters, Kristin; Pfeifer, Svenja M.; Prati, Sebastian; Probst, Alexander J.; Reiner, Dominik; Rolauffs, Peter; Schlenker, Alexandra; Schmidt, Torsten C.; Shah, Mana; Sieber, Guido; Stach, Tom Lennard; Tielke, Ann-Kathrin; Vermiert, Anna-Maria; Weiss, Martina; Weitere, Markus; Sures, Bernd
    The Asymmetric Response Concept explains ecological consequences of multiple stressor exposure and release
    In: Science of the Total Environment Vol. 872 (2023) 162196
  • Dobaradaran, Sina; Mutke, Xenia A.M.; Schmidt, Torsten Claus; Swiderski, Philipp; De-la-Torre, Gabriel E.; Jochmann, Maik
    Aromatic amines contents of cigarette butts : Fresh and aged cigarette butts vs unsmoked cigarette
    In: Chemosphere Vol. 301 (2022) 134735
  • Marks, Robert; Jochmann, Maik; Brand, Willi A.; Schmidt, Torsten
    How to Couple LC-IRMS with HRMS : A Proof-of-Concept Study
    In: Analytical Chemistry Vol. 94 (2022) Nr. 6, pp. 2981 - 2987
  • Kaziur-Cegla, Wiebke; Wykowski, Lena; Jochmann, Maik; Molt, Karl; Bruchmann, Andreas; Schmidt, Torsten Claus
    In-tube dynamic extraction a green solventless alternative for a sensitive headspace analysis of volatile organic compounds in olive oils
    In: Advances in Sample Preparation Vol. 1 (2022) 100002
  • Kaziur-Cegla, Wiebke; Jochmann, Maik A.; Molt, Karl; Bruchmann, Andreas; Schmidt, Torsten Claus
    In-tube dynamic extraction for analysis of volatile organic compounds in honey samples
    In: Food Chemistry: X Vol. 14 (2022) 100337
  • Hesse, Tobias; Nachev, Milen; Khaliq, Shaista; Jochmann, Maik; Franke, Frederik; Scharsack, Jörn P.; Kurtz, Joachim; Sures, Bernd; Schmidt, Torsten Claus
    Insights into amino acid fractionation and incorporation by compound-specific carbon isotope analysis of three-spined sticklebacks
    In: Scientific Reports Vol. 12 (2022) Nr. 1, 11690
  • Terhalle, Jens; Nikutta, Simon E.; Krzeciesa, Dawid L.; Lutze, Holger; Jochmann, Maik; Schmidt, Torsten C.
    Linking reaction rate constants and isotope fractionation of ozonation reactions using phenols as probes
    In: Water Research Vol. 210 (2022) 117931
  • Tintrop, Lucie K.; Jochmann, Maik; Beesley, Thomas; Küppers, Marco; Brunstermann, Ruth; Schmidt, Torsten Claus
    Optimization and automation of rapid and selective analysis of fatty acid methyl esters from aqueous samples by headspace SPME arrow extraction followed by GC–MS/MS analysis
    In: Analytical and Bioanalytical Chemistry Vol. 414 (2022) Nr. 22, pp. 6473 - 6483
  • Martin, Philipp R.; Buchner, Daniel; Jochmann, Maik; Elsner, Martin; Haderlein, Stefan B.
    Two Pathways Compete in the Mn(II)-Catalyzed Oxidation of Aminotrismethylene Phosphonate (ATMP)
    In: Environmental Science & Technology Vol. 56 (2022) Nr. 7, pp. 4091 - 4100
  • Dobaradaran, Sina; Schmidt, Torsten Claus; Kaziur-Cegla, Wiebke; Jochmann, Maik
    BTEX compounds leachates from cigarette butts into water environment : A primary study
    In: Environmental Pollution Vol. 269 (2021) pp. 116185
  • Khademi, Seyed Mohammad; Salemi, Amir; Jochmann, Maik; Joksimoski, Sasho; Telgheder, Ursula
    Development and comparison of direct immersion solid phase micro extraction Arrow-GC-MS for the determination of selected pesticides in water
    In: Microchemical Journal Vol. 164 (2021) 106006
  • Vivas Muñoz, Jenny C.; Feld, Christian; Hilt, Sabine; Manfrin, Alessandro; Nachev, Milen; Köster, Daniel; Jochmann, Maik; Schmidt, Torsten Claus; Sures, Bernd; Ziková, Andrea; Knopf, Klaus
    Eye fluke infection changes diet composition in juvenile European perch (Perca fluviatilis)
    In: Scientific Reports Vol. 11 (2021) Nr. 1, 3440
  • Becker, Christian; Jochmann, Maik; Teutenberg, Thorsten; Schmidt, Torsten Claus
    A nebulizer interface for liquid chromatography - Flame ionization detection : Development and validation
    In: Talanta: The International Journal of Pure and Applied Analytical Chemistry Vol. 206 (2020) 120229
  • Willach, Sarah; Lutze, Holger V.; Somnitz, Holger; Terhalle, Jens; Stojanovic, Nenad; Lüling, Michelle; Jochmann, Maik A.; Hofstetter, Thomas B.; Schmidt, Torsten Claus
    Carbon Isotope Fractionation of Substituted Benzene Analogs during Oxidation with Ozone and Hydroxyl Radicals : How Should Experimental Data Be Interpreted?
    In: Environmental Science & Technology Vol. 54 (2020) Nr. 11, pp. 6713 - 6722
  • Becker, Christian; Deeb, Ahmad A.; Teutenberg, Thorsten; Jochmann, Maik; Schmidt, Torsten Claus
    Determination of liquid chromatography/flame ionization detection response factors for N-heterocycles, carboxylic acids, halogenated compounds, and others
    In: Analytical and Bioanalytical Chemistry Vol. 412 (2020) Nr. 1, pp. 171 - 179
  • Kaziur-Cegla, Wiebke; Salemi, Amir; Jochmann, Maik; Schmidt, Torsten Claus
    Optimization and validation of automated solid-phase microextraction arrow technique for determination of phosphorus flame retardants in water
    In: Journal of Chromatography A Vol. 1626 (2020) pp. 461349
  • Dobaradaran, Sina; Schmidt, Torsten Claus; Lorenzo-Parodi, Nerea; Kaziur-Cegla, Wiebke; Jochmann, Maik; Nabipour, Iraj; Lutze, Holger; Telgheder, Ursula
    Polycyclic aromatic hydrocarbons (PAHs) leachates from cigarette butts into water
    In: Environmental Pollution Vol. 259 (2020) pp. 113916
  • Martin, Philipp R.; Buchner, Daniel; Jochmann, Maik; Haderlein, Stefan B.
    Stable carbon isotope analysis of polyphosphonate complexing agents by anion chromatography coupled to isotope ratio mass spectrometry : Method development and application
    In: Analytical and Bioanalytical Chemistry Vol. 412 (2020) Nr. 20, pp. 4827 - 4835
  • Gilbert, Beric M.; Nachev, Milen; Jochmann, Maik A.; Schmidt, Torsten Claus; Köster, Daniel; Sures, Bernd; Avenant-Oldewage, Annemariè
    Stable isotope analysis spills the beans about spatial variance in trophic structure in a fish host – parasite system from the Vaal River System, South Africa
    In: International Journal for Parasitology: Parasites and Wildlife Vol. 12 (2020) pp. 134 - 141
  • Gilbert, Beric M.; Nachev, Milen; Jochmann, Maik; Schmidt, Torsten Claus; Köster, Daniel; Sures, Bernd; Avenant-Oldewage, Annemariè
    You are how you eat : Differences in trophic position of two parasite species infecting a single host according to stable isotopes
    In: Parasitology Research Vol. 119 (2020) Nr. 4, pp. 1393 - 1400
  • Schulte, S.M.; Jochmann, Maik; Wolbert, Jens-Benjamin; Gehrke, Tilman; Schmidt, Torsten Claus
    A centrifuge tube reactor for the determination of bacterial methane oxidation enrichment factors without influence of diffusion related isotope fractionation
    In: Science of the Total Environment Vol. 659 (2019) pp. 1382 - 1386
  • Akinlua, Akinsehinwa; Jochmann, Maik; Lorenzo-Parodi, Nerea; Stojanovic, Nenad; Kaziur, Wiebke; Schmidt, Torsten C.
    A green approach for the extraction of diamondoids from petroleum source rock
    In: Analytica Chimica Acta Vol. 1091 (2019) pp. 23 - 29
  • Becker, Christian; Jochmann, Maik; Schmidt, Torsten Claus
    An overview of approaches in liquid chromatography flame ionization detection
    In: Trends in Analytical Chemistry (TrAC) Vol. 110 (2019) pp. 143 - 149
  • Schulte, Simone M.; Köster, Daniel; Jochmann, Maik; Meckenstock, Rainer
    Applying reverse stable isotope labeling analysis by mid-infrared laser spectroscopy to monitor BDOC in recycled wastewater
    In: Science of the Total Environment Vol. 665 (2019) pp. 1064 - 1072
  • Kaziur, Wiebke; Salemi, Amir; Jochmann, Maik; Schmidt, Torsten Claus
    Automated determination of picogram-per-liter level of water taste and odor compounds using solid-phase microextraction arrow coupled with gas chromatography-mass spectrometry
    In: Analytical and Bioanalytical Chemistry (2019)
  • Dobaradaran, Sina; Schmidt, Torsten Claus; Lorenzo-Parodi, Nerea; Jochmann, Maik; Nabipour, Iraj; Raeisi, Alireza; Stojanovic, Nenad; Mahmoodi, Marzieh
    Cigarette butts: An overlooked source of PAHs in the environment?
    In: Environmental Pollution Vol. 249 (2019) pp. 932 - 939
  • Kalus, Mark; Lanyumba, Riskyanti; Lorenzo-Parodi, Nerea; Jochmann, Maik; Kerpen, Klaus; Hagemann, Ulrich; Schmidt, Torsten Claus; Barcikowski, Stephan; Gökce, Bilal
    Correction : Determining the role of redox-active materials during laser-induced water decomposition
    In: Physical Chemistry, Chemical Physics (PCCP) Vol. 21 (2019) Nr. 43, pp. 24239
  • Becker, Christian; Jochmann, Maik; Schmidt, Torsten Claus
    Determination of liquid chromatography/flame ionization detection response factors for alcohols, ketones, and sugars
    In: Analytical and Bioanalytical Chemistry Vol. 411 (2019) Nr. 12, pp. 2635 - 2644
  • Kalus, Mark; Lanyumba, Riskyanti; Lorenzo-Parodi, Nerea; Jochmann, Maik; Kerpen, Klaus; Hagemann, Ulrich; Schmidt, Torsten Claus; Barcikowski, Stephan; Gökce, Bilal; Lorenzo Parodi, Nerea
    Determining the role of redox-active materials during laser-induced water decomposition
    In: Physical Chemistry, Chemical Physics (PCCP) Vol. 21 (2019) Nr. 34, pp. 18636 - 18651
  • Köster, Daniel; Jochmann, Maik; Lutze, Holger; Schmidt, Torsten Claus
    Monitoring of the total carbon and nitrogen balance during the mineralization of nitrogen containing compounds by heat activated persulfate
    In: Chemical Engineering Journal Vol. 367 (2019) pp. 160 - 168
  • Köster, Daniel; Sanchez Villalobos, Irene M.; Jochmann, Maik; Brand, Willi A.; Schmidt, Torsten Claus
    New Concepts for the Determination of Oxidation Efficiencies in Liquid Chromatography-Isotope Ratio Mass Spectrometry
    In: Analytical Chemistry Vol. 91 (2019) Nr. 8, pp. 5067 - 5073
  • Lorenzo-Parodi, Nerea; Kaziur, Wiebke; Stojanovic, Nenad; Jochmann, Maik; Schmidt, Torsten Claus
    Solventless microextraction techniques for water analysis
    In: Trends in Analytical Chemistry (TrAC) Vol. 113 (2019) pp. 321 - 331
  • Sures, Bernd; Nachev, Milen; Gilbert, Beric M.; Dos Santos, Quinton Marco; Jochmann, Maik; Köster, Daniel; Schmidt, Torsten Claus; Avenant-Oldewage, Annemarié
    The monogenean Paradiplozoon ichthyoxanthon behaves like a micropredator on two of its hosts, as indicated by stable isotopes
    In: Journal of Helminthology Vol. 93 (2019) Nr. 1, pp. 71 - 75
  • Schulte, Marcel; Jochmann, Maik; Gehrke, Tilman; Denecke, Martin; Schmidt, Torsten Claus
    Carbon Isotopic Fractionation via Diffusion in a Coarse Material
    In: Geochemistry, Geophysics, Geosystems Vol. 19 (2018) Nr. 9, pp. 3246 - 3253
  • Willach, Sarah; Lutze, Holger; Eckey, Kevin; Löppenberg, Katja; Lüling, Michelle; Wolbert, Jens-Benjamin; Kujawinski, Dorothea M.; Jochmann, Maik; Karst, Uwe; Schmidt, Torsten Claus
    Direct Photolysis of Sulfamethoxazole Using Various Irradiation Sources and Wavelength Ranges - Insights from Degradation Product Analysis and Compound-Specific Stable Isotope Analysis
    In: Environmental Science & Technology Vol. 52 (2018) Nr. 3, pp. 1225 - 1233
  • Köster, Daniel; Wolbert, Jens-Benjamin; Schulte, Marcel; Jochmann, Maik; Schmidt, Torsten Claus
    Origin of Xylitol in Chewing Gum : A Compound-Specific Isotope Technique for the Differentiation of Corn- and Wood-Based Xylitol by LC-IRMS
    In: Journal of Agricultural and Food Chemistry Vol. 66 (2018) Nr. 8, pp. 2015 - 2020
  • Schulte, Marcel; Jochmann, Maik; Gehrke, Tobias; Thom, Andrea; Ricken, Tim; Denecke, Martin; Schmidt, Torsten Claus
    Characterization of methane oxidation in a simulated landfill cover system by comparing molecular and stable isotope mass balances
    In: Waste Management Vol. 69 (2017) pp. 281 - 288
  • Willach, Sarah; Lutze, Holger; Eckey, Kevin; Löppenberg, Katja; Lüling, Michelle; Terhalle, Jens; Wolbert, Jens-Benjamin; Jochmann, Maik; Karst, Uwe; Schmidt, Torsten Claus
    Degradation of sulfamethoxazole using ozone and chlorine dioxide : Compound-specific stable isotope analysis, transformation product analysis and mechanistic aspects
    In: Water Research Vol. 122 (2017) pp. 280 - 289
  • Osorio Barajas, Xochitli L.; Hüffer, Thorsten; Mettig, Pascal; Schilling, Beat; Jochmann, Maik; Schmidt, Torsten Claus
    Investigation of carbon-based nanomaterials as sorbents for headspace in-tube extraction of polycyclic aromatic hydrocarbons
    In: Analytical and Bioanalytical Chemistry Vol. 409 (2017) Nr. 15, pp. 3861 - 3870
  • Dong, Xiyang; Jochmann, Maik; Elsner, Martin; Meyer, Armin H.; Bäcker, Leonard E.; Rahmatullah, Mona; Schunk, Daniel; Lens, Guido; Meckenstock, Rainer
    Monitoring Microbial Mineralization Using Reverse Stable Isotope Labeling Analysis by Mid-Infrared Laser Spectroscopy
    In: Environmental Science & Technology Vol. 51 (2017) Nr. 20, pp. 11876 - 11883
  • Barajas, Xochitli L. Osorio; Jochmann, Maik; Hüffer, Thorsten; Schilling, Beat; Schmidt, Torsten Claus
    Sorbent material characterization using in-tube extraction needles as inverse gas chromatography column
    In: Journal of Separation Science Vol. 40 (2017) Nr. 11, pp. 2390 - 2397
  • Nachev, Milen; Jochmann, Maik; Walter, Friederike; Wolbert, Jens-Benjamin; Schulte, Marcel; Schmidt, Torsten Claus; Sures, Bernd
    Understanding trophic interactions in host-parasite associations using stable isotopes of carbon and nitrogen
    In: Parasites and Vectors Vol. 10 (2017) Nr. 1,
  • Weigold, Pascal; El-Hadidi, Mohamed; Ruecker, Alexander; Huson, Daniel H.; Scholten, Thomas; Jochmann, Maik; Kappler, Andreas; Behrens, Sebastian
    A metagenomic-based survey of microbial (de)halogenation potential in a German forest soil
    In: Scientific Reports Vol. 6 (2016) pp. 28958
  • Dunkel, Thiemo; Lizette de León Gallegos, Erika; Schönsee, Carina D.; Hesse, Tobias; Jochmann, Maik; Wingender, Jost; Denecke, Martin
    Evaluating the influence of wastewater composition on the growth of Microthrix parvicella by GCxGC/qMS and real-time PCR
    In: Water Research Vol. 88 (2016) pp. 510 - 523
  • Kremser, Andreas; Jochmann, Maik; Schmidt, Torsten Claus
    PAL SPME Arrow — evaluation of a novel solid-phase microextraction device for freely dissolved PAHs in water
    In: Analytical and Bioanalytical Chemistry Vol. 408 (2016) Nr. 3, pp. 943 - 952
  • Kupilas, Benjamin; Hering, Daniel; Lorenz, Armin; Jochmann, Maik; G. McKie, Brendan; Friberg, Nikolai
    River restoration and the trophic structure of benthic invertebrate communities across 16 European restoration projects
    In: Hydrobiologia Vol. 169 (2016) Nr. 1, pp. 105 - 120
  • Kremser, Andreas; Jochmann, Maik; Schmidt, Torsten Claus
    Systematic comparison of static and dynamic headspace sampling techniques for gas chromatography
    In: Analytical and Bioanalytical Chemistry Vol. 408 (2016) Nr. 24, pp. 6567 - 6579
  • Rahman, Mohammed M.; Barajas, Xochitli L. O.; Luján, Jacobo L. H.; Jochmann, Maik; Mayer, Christian; Schmidt, Torsten Claus
    Core-Shell hybrid particles by alternating copolymerization of ionic liquid monomers from silica as sorbent for solid phase microextraction
    In: Macromolecular Materials and Engineering Vol. 300 (2015) Nr. 11, pp. 1049 - 1056
  • Mogusu, Emmanuel Onyonka; Wolbert, Jens-Benjamin; Kujawinski, Dorothea M.; Jochmann, Maik; Elsner, Martin
    Dual element (15N/14N, 13C/12C) isotope analysis of glyphosate and AMPA by derivatization-gas chromatography isotope ratio mass spectrometry (GC/IRMS) combined with LC/IRMS
    In: Analytical and Bioanalytical Chemistry Vol. 407 (2015) Nr. 18, pp. 5249 - 5260
  • Weigold, Pascal; Ruecker, Alexander; Jochmann, Maik; Osorio, Xochitli; Lege, Sascha; Zwiener, C.; Kappler, Andreas; Behrens, Sebastian
    Formation of chloroform and tetrachloroethene by Sinorhizobium meliloti strain 1021
    In: Letters in applied microbiology Vol. 61 (2015) Nr. 4, pp. 346 - 353
  • Ruecker, A.; Weigold, P.; Behrens, S.; Jochmann, Maik; Barajas, X. L. Osorio; Kappler, A.
    Halogenated hydrocarbon formation in a moderately acidic salt lake in Western Australia - Role of abiotic and biotic processes
    In: Environmental Chemistry Vol. 12 (2015) Nr. 4, pp. 406 - 414
  • Akinlua, Akinsehinwa; Schmidt, Torsten Claus; Jochmann, Maik
    Ionic Liquid as Green Solvent for Leaching of Polycyclic Aromatic Hydrocarbons from Petroleum Source Rock
    In: Industrial & engineering chemistry research Vol. 54 (2015) Nr. 51, pp. 12960 - 12965
  • Akinlua, Akinsehinwa; Jochmann, Maik; Schmidt, Torsten Claus
    Microwave-assisted ionic liquid extraction of n-alkanes and isoprenoid hydrocarbons from petroleum source rock
    In: Chromatographia: an international journal for rapid communication in chromatography, electrophoresis, and associated techniques Vol. 78 (2015) Nr. 17, pp. 1201 - 1209
  • Blessing, Michaela; Jochmann, Maik; Haderlein, Stefan B.; Schmidt, Torsten Claus
    Optimization of a large-volume injection method for compound-specific isotope analysis of polycyclic aromatic compounds at trace concentrations
    In: Rapid Communications in Mass Spectrometry Vol. 29 (2015) Nr. 24, pp. 2349 - 2360
  • Laaks, Jens; Jochmann, Maik; Schilling, Beat; Schmidt, Torsten Claus
    Optimization strategies of in-tube extraction (ITEX) methods
    In: Analytical and Bioanalytical Chemistry Vol. 407 (2015) Nr. 22, pp. 6827 - 6838
  • Zhang, Lijun; Thevis, Mario; Piper, Thomas; Jochmann, Maik; Wolbert, Jens-Benjamin; Kujawinski, Dorothea M.; Wiese, Steffen; Teutenberg, Thorsten; Schmidt, Torsten Claus
    Carbon isotope ratio analysis of steroids by high temperature liquid chromatography - isotope ratio mass spectrometry
    In: Analytical Chemistry Vol. 86 (2014) Nr. 5, pp. 2297 - 2302
  • Laaks, Jens; Jochmann, Maik; Schilling, Beat; Molt, Karl; Schmidt, Torsten Claus
    In-tube extraction-GC-MS as a high-capacity enrichment technique for the analysis of alcoholic beverages
    In: Journal of Agricultural and Food Chemistry Vol. 62 (2014) Nr. 14, pp. 3081 - 3091
  • Ruecker, A.; Weigold, P.; Behrens, S.; Jochmann, Maik; Laaks, J.; Kappler, A.
    Predominance of biotic over abiotic formation of halogenated hydrocarbons in hypersaline sediments in Western Australia
    In: Environmental Science & Technology Vol. 48 (2014) Nr. 16, pp. 9170 - 9178
  • Kujawinski, Dorothea M.; Wolbert, Jens-Benjamin; Zhang, Lijun; Jochmann, Maik; Widory, David; Baran, Nicole; Schmidt, Torsten Claus
    Carbon isotope ratio measurements of glyphosate and AMPA by liquid chromatography coupled to isotope ratio mass spectrometry
    In: Analytical and Bioanalytical Chemistry Vol. 405 (2013) Nr. 9, pp. 2869 - 2878
  • Schmidt, Torsten Claus; Jochmann, Maik; Laaks, Jens
    Empfindlich, automatisch und ohne Lösungsmittel
    In: Nachrichten aus der Chemie Vol. 61 (2013) pp. 54 - 56
  • Hüffer, Thorsten; Osorio, Xochitli; Jochmann, Maik; Schilling, Beat; Schmidt, Torsten Claus
    Multi-walled carbon nanotubes as sorptive material for solventless in-tube microextraction (ITEX2) - a factorial design study
    In: Analytical & bioanalytical chemistry Vol. 405 (2013) Nr. 26, pp. 8387 - 8395
  • Wuerfel, Oliver; Greule, Markus; Keppler, Frank; Jochmann, Maik; Schmidt, Torsten Claus
    Position-specific isotope analysis of the methyl group carbon in methylcobalamin for the investigation of biomethylation processes
    In: Analytical and Bioanalytical Chemistry Vol. 405 (2013) Nr. 9, pp. 2833 - 2841
  • Zhang, Lijun; Kujawinski, Dorothea M.; Federherr, Eugen; Schmidt, Torsten Claus; Jochmann, Maik
    Caffeine in your drink : natural or synthetic?
    In: Analytical Chemistry Vol. 84 (2012) Nr. 6, pp. 2805 - 2810
  • Elsner, Martin; Jochmann, Maik; Hofstetter, Thomas B.; Hunkeler, Daniel; Bernstein, Anat; Schmidt, Torsten Claus; Schimmelmann, Arndt
    Current challenges in compound-specific stable isotope analysis of environmental organic contaminants
    In: Analytical and Bioanalytical Chemistry Vol. 403 (2012) Nr. 9, pp. 2471 - 2491
  • Akinlua, Akinsehinwa; Jochmann, Maik; Qian, Yuan; Sulkowski, Martin; Schmidt, Torsten Claus
    Factors controlling leaching of polycyclic aromatic hydrocarbons from petroleum source rock using nonionic surfactant
    In: Chromatographia: an international journal for rapid communication in chromatography, electrophoresis, and associated techniques Vol. 75 (2012) Nr. 5-6, pp. 213 - 221
  • Laaks, Jens; Letzel, Thomas; Schmidt, Torsten Claus; Jochmann, Maik
    Fingerprinting of red wine by headspace solid-phase dynamic extraction of volatile constituents
    In: Analytical and Bioanalytical Chemistry Vol. 403 (2012) Nr. 8, pp. 2429 - 2436
  • Schmidt, Torsten Claus; Jochmann, Maik
    Origin and Fate of Organic Compounds in Water : Characterization by Compound-Specific Stable Isotope Analysis
    In: Annual Review of Analytical Chemistry Vol. 5 (2012) Nr. 5, pp. 133 - 155
  • Laaks, Jens; Jochmann, Maik; Schmidt, Torsten Claus
    Solvent-free microextraction techniques in gas chromatography
    In: Analytical and Bioanalytical Chemistry Vol. 402 (2012) Nr. 2, pp. 565 - 571
  • Kujawinski, Dorothea M.; Zhang, Lijun; Schmidt, Torsten Claus; Jochmann, Maik
    When other separation techniques fail : compound-specific carbon isotope ratio analysis of sulfonamide containing pharmaceuticals by high-temperature-liquid chromatography-isotope ratio mass spectrometry
    In: Analytical Chemistry Vol. 84 (2012) Nr. 18, pp. 7656 - 7663
  • Bernstein, Anat; Shouakar-Stash, Orfan; Ebert, Karin; Laskov, Christine; Hunkeler, Daniel; Jeannottat, Simon; Sakaguchi-Söder, Kaori; Laaks, Jens; Jochmann, Maik; Cretnik, Stefan; Jager, Johannes; Haderlein, Stefan B.; Schmidt, Torsten Claus; Aravena, Ramon; Elsner, Martin
    Compound-specific chlorine isotope analysis : a comparison of gas chromatography/isotope ratio mass spectrometry and gas chromatography/quadrupole mass spectrometry methods in an interlaboratory study
    In: Analytical Chemistry Vol. 83 (2011) Nr. 20, pp. 7624 - 7634
  • Zhang, Lijun; Kujawinski, Dorothea M.; Jochmann, Maik; Schmidt, Torsten Claus
    High-temperature reversed-phase liquid chromatography coupled to isotope ratio mass spectrometry
    In: Rapid Communications in Mass Spectrometry Vol. 25 (2011) Nr. 20, pp. 2971 - 2980
  • Akinlua, A.; Jochmann, Maik; Laaks, J.; Ewert, A.; Schmidt, Torsten Claus
    Microwave-assisted nonionic surfactant extraction of aliphatic hydrocarbons from petroleum source rock
    In: Analytica Chimica Acta Vol. 691 (2011) Nr. 1-2, pp. 48 - 55
  • Laaks, Jens; Jochmann, Maik; Schilling, Beat; Schmidt, Torsten Claus
    In-tube extraction of volatile organic compounds from aqueous samples : an economical alternative to purge and trap enrichment
    In: Analytical Chemistry Vol. 82 (2010) Nr. 18, pp. 7641 - 7648
  • Kujawinski, Dorothea M.; Stephan, Manuel; Jochmann, Maik; Krajenke, Karen; Haas, Joe; Schmidt, Torsten Claus
    Stable carbon and hydrogen isotope analysis of methyl tert-butyl ether and tert-amyl methyl ether by purge and trap-gas chromatography-isotope ratio mass spectrometry : method evaluation and application
    In: Journal of environmental monitoring : JEM Vol. 12 (2010) Nr. 1, pp. 347 - 354
  • Telgheder, Ursula; Malinowski, Malwin; Jochmann, Maik
    Determination of volatile organic compounds by solid-phase microextraction-gas chromatography-differential mobility spectrometry
    In: International Journal for Ion Mobility Spectrometry Vol. 12 (2009) Nr. 4, pp. 123 - 130
  • Jochmann, Maik; Steinmann, Dirk; Stephan, Manuel; Schmidt, Torsten Claus
    Flow iInjection analysis−isotope ratio mass spectrometry for bulk carbon stable isotope analysis of alcoholic beverages
    In: Journal of Agricultural and Food Chemistry Vol. 57 (2009) Nr. 22, pp. 10489 - 10496
  • Jochmann, Maik; Yuan, Xue; Schilling, Beat; Schmidt, Torsten Claus
    In-tube extraction for enrichment of volatile organic hydrocarbons from aqueous samples
    In: Journal of Chromatography A Vol. 1179 (2008) Nr. 2, pp. 96 - 105
  • Blessing, Michaela; Jochmann, Maik; Schmidt, Torsten Claus
    Pitfalls in compound-specific isotope analysis of environmental samples
    In: Analytical and Bioanalytical Chemistry Vol. 390 (2008) Nr. 2, pp. 591 - 603
  • Jochmann, Maik; Yuan, Xue; Schmidt, Torsten Claus
    Determination of volatile organic hydrocarbons in water samples by solid-phase dynamic extraction
    In: Analytical and Bioanalytical Chemistry Vol. 387 (2007) Nr. 6, pp. 2163 - 2174
  • Gocht, Tilman; Barth, Johannes A. C.; Epp, Michaela; Jochmann, Maik; Blessing, Michaela; Schmidt, Torsten Claus; Grathwohl, Peter
    Indications for pedogenic formation of perylene in a terrestrial soil profile : depth distribution and first results from stable carbon isotope ratios
    In: Applied Geochemistry Vol. 22 (2007) Nr. 12, pp. 2652 - 2663
  • Schmidt, Torsten Claus; Jochmann, Maik; Blessing, Michaela
    Isotopenanalyse : ein neues Werkzeug in der Umweltanalytik
    In: Nachrichten aus der Chemie Vol. 55 (2007) Nr. 5, pp. 536 - 539
  • Jochmann, Maik; Blessing, Michaela; Haderlein, Stefan B.; Schmidt, Torsten Claus
    A new approach to determine method detection limits for compound-specific isotope analysis of volatile organic compounds
    In: Rapid Communications in Mass Spectrometry Vol. 20 (2006) Nr. 24, pp. 3639 - 3648
  • Jochmann, Maik; Kmiecik, Magda P.; Schmidt, Torsten Claus
    Solid-phase dynamic extraction for the enrichment of polar volatile organic compounds from water
    In: Journal of Chromatography A Vol. 1115 (2006) Nr. 1/2, pp. 208 - 216
  • Books, Collections, Proceedings

  • Jochmann, Maik; Schmidt, Torsten Claus
    Compound-specific Stable Isotope Analysis
    Cambridge (2012) 376 S.
  • Posters / Proceedings posters

  • Dunkel, Thiemo; Lizette de León Gallegos, Erika; Schönsee, Carina D.; Hesse, Tobias; Jochmann, Maik; Denecke, Martin; Wingender, Jost;
    Evaluating influences of wastewater composition on the growth of M. Parvicella by GCxGC-qMS and QPCR : poster presentation
    12th IWA Leading Edge Conference on Water and Wastewater Technologies, 30.05.-03.06.2015, Hongkong,
    (2015)

RESEARCH INTERESTS

Development of enrichment techniques for Compound Specific Isotope Analysis


EDUCATION
1995 Abitur (A-Level equiv.)
1996 – 1997 Biochemistry studies at the Ruhr-University Bochum
1997 – 2003 Chemistry at the Westfalien-Wilhelms University Münster
Diploma Thesis at the Center for Applied Geoscience (ZAG) in the group of Prof. Stefan B. Haderlein and external supervision by Prof. Dr. Karl Cammann (University Münster) with the subject “Determination of heterocyclic compounds in groundwater with direct-aqueous injection GC/MS”.
2003 - 2006 PhD at the Center for Applied Geoscience (ZAG) in Tübingen in the Environmental Minarology Group of
Prof. Stefan B. Haderlein
Since 2006 Research scientist in the group Prof. Torsten C. Schmidt of chair for Instrumental Analytical Chemistry (IAC) at the University Duisburg-Essen

PROFESSIONAL EXPERIENCES
Extraction Techniques such as:
- Solid-phase microextraction (SPME)
- Solid-phase dynamic extraction (SPDE)
- In-tube extraction (ITEX)
- Accelerated Solvent Extraction (ASE)
- Purge & Trap (P&T)

Separation techniques:
- GC/MS/FID/ECD/TCD
- HPLC/UV/Vis/FD/MS

Injection techniques:
- Large Volume Injection (LVI)
- Direct Aqueous Injection (DAI)

Compound Specific Isotope Analysis:
- GC/IRMS
- LC/IRMS

Spectroscopy:
- UV/vis

MEMBER
German Chemical Society (GDCh)
Divisions on:
Analytical Chemistry
Water Chemistry
Benelux Association for Stable Isotope Scientists (BASIS)

REVIEWER ACTIVITY
- Journal of Separation Science
- Environmental Science & Technology