Publikationen von Willi A. Brand

Robert G. H. Marks, Maik A. Jochmann, Willi A. Brand, and Torsten C. Schmidt, "How to couple LC-IRMS with HRMS─A proof-of-concept study," Analytical Chemistry 94 (6), 2981-2987 (2022).

Haiping Qi, Heiko Moossen, Harro A.J. Meijer, Tyler B. Coplen, Anita T. Aerts-Bijma, Lauren Reid, Heike Geilmann, Juergen Richter, Michael Rothe, Willi A. Brand, Blaza Toman, Jacqueline Benefield, and Jean-François Hélie, "USGS44, a new high purity calcium carbonate reference material for delta¹³C measurements," Rapid Communications in Mass Spectrometry 35 (4), e9006 (2021).

Peter Sperlich, Heiko Moossen, Heike Geilmann, Sarah J. Bury, Julie C.S. Brown, Rowena C. Moss, Gordon W. Brailsford, and Willi A. Brand, "A robust method for direct calibration of isotope ratios in gases against liquid/solid reference materials, including a laboratory comparison for delta¹³C‐CH₄," Rapid Communications in Mass Spectrometry 35 (1), e8944 (2020).

Markus Greule, Heiko Moossen, Marx K. Lloyd, Heike Geilmann, Willi A. Brand, John M. Eiler, Haiping Qi, and Frank Keppler, "Three wood isotopic reference materials for delta²H and delta¹³C measurements of plant methoxy groups," Chemical Geology 533, 119428 (2020).

Markus Greule, Heiko Moossen, Heike Geilmann, Willi A. Brand, and Frank Keppler, "Methyl sulfates as methoxy isotopic reference materials for delta¹³C and delta²H measurements," Rapid Communications in Mass Spectrometry 33 (4), 343-350 (2019).

Daniel Koester, Irene Maria Sanchez Villalobos, Maik A. Jochmann, Willi A. Brand, and and Torsten Claus Schmidt, "New concepts for the determination of oxidation efficiencies in liquid chromatography isotope ratio mass spectrometry," Analytical Chemistry 91 (8), 5067-5073 (2019).

Andrei Rodionov, Eva Lehndorff, Ciprian C. Stremtan, Willi A. Brand, Heinz-Peter Königshoven, and Wulf Amelung, "Spatial microanalysis of natural ¹³C/¹²C abundance in environmental samples using laser ablation-isotope ratio mass spectrometry," Analytical Chemistry 91 (9), 6225-6232 (2019).

Nathaniel E. Ostrom, Hasand Gandhi, Tyler B. Coplen, Sakae Toyoda, J.K. Böhlke, Willi A. Brand, Karen L. Casciotti, Jens Dyckmans, Anette Giesemann, Joachim Mohn, Reinhard Well, Longfei Yu, and Naohiro Yoshida, "Preliminary assessment of stable nitrogen and oxygen isotopic composition of USGS51 and USGS52 nitrous oxide reference gases and perspectives on calibration needs," Rapid Communications in Mass Spectrometry 32 (15), 1207-1214 (2018).

Taku Umezawa, Carl A. M. Brenninkmeijer, Thomas Röckmann, Carina van der Veen, Stanley C. Tyler, Ryo Fujita, Shinji Morimoto, Shuji Aoki, Todd Sowers, Jochen Schmitt, Michael Bock, Jonas Beck, Hubertus Fischer, Sylvia E. Michel, Bruce H. Vaughn, John B. Miller, JamesW. C. White, Gordon Brailsford, Hinrich Schaefer, Peter Sperlich, W. A. Brand, Michael Rothe, Thomas Blunier, David Lowry, Rebecca E. Fisher, Euan G. Nisbet, Andrew L. Rice, Peter Bergamaschi, Cordelia Veidt, and Ingeborg Levin, "Interlaboratory comparison of delta ¹³C and deltaD measurements of atmospheric CH₄ for combined use of data sets from different laboratories," Atmospheric Measurement Techniques 11 (2), 1207-1231 (2018).

Diana Mance, Heike Geilmann, Willi A. Brand, Thorben Kewitz, and Holger Kersten, "Changes of ²H and ¹⁸O abundances in water treated with non-thermal atmospheric pressure plasma jet," Plasma Processes and Polymers 14 (10), e1600239 (2017).

Haiping Qi, Tyler B. Coplen, Matthias Gehre, Torsten W. Vennemann, Willi A. Brand, Heike Geilmann, Gerard Olack, Ilya N. Bindeman, Jim Palandri, Li Huang, and Fred J. Longstaffe, "New biotite and muscovite isotopic reference materials, USGS57 and USGS58, for δ²H measurements–A replacement for NBS 30," Chemical Geology 467, 89-99 (2017).

Matthias Gehre, Julian Renpenning, Heike Geilmann, Haiping Qi, Tyler B. Coplen, Steffen Kümmel, Natalija Ivdra, Willi A. Brand, and Arndt Schimmelmann, "Optimization of on-line hydrogen stable isotope ratio measurements of halogen- and sulfur-bearing organic compounds using elemental analyzer–chromium/high-temperature conversion isotope ratio mass spectrometry (EA-Cr/HTC-IRMS)," Rapid Communications in Mass Spectrometry 31 (6), 475-484 (2017).

Peter Sperlich, Nelly A. M. Uitslag, J. M. Richter, Michael Rothe, Heike Geilmann, C. van der Veen, T. Röckmann, T. Blunier, and Willi A. Brand, "Development and evaluation of a suite of isotope reference gases for methane in air," Atmospheric Measurement Techniques 9 (8), 3717-3737 (2016).

Thomas Röckmann, Simon Eyer, Carina van der Veen, Maria-Elena Popa, Béla Tuzson, Guillaume Monteil, Sander Houweling, Eliza Harris, Dominik Brunner, Hubertus Fischer, Giulia Zazzeri, David Lowry, Euan G. Nisbet, Willi A. Brand, Jaroslav M. Necki, Lukas Emmenegger, and Joachim Mohn, "In situ observations of the isotopic composition of methane at the Cabauw tall tower site," Atmospheric Chemistry and Physics 16, 10469-10487 (2016).

Willi A. Brand, Michael Rothe, Peter Sperlich, Martin Strube, and Magnus Wendeberg, "Automated simultaneous measurement of the δ¹³C and δ²H values of methane and the δ¹³C and δ¹⁸O values of carbon dioxide in flask air samples using a new multi cryo-trap/gas chromatography/isotope ratio mass spectrometry system," Rapid Communications in Mass Spectrometry 30 (13), 1523-1539 (2016).

S. Eyer, B. Tuzson, M. E. Popa, C. van der Veen, T. Röckmann, Michael Rothe, Willi A. Brand, R. Fisher, D. Lowry, E. G. Nisbet, M. S. Brennwald, E. Harris, C. Zellweger, L. Emmenegger, H. Fischer, and J. Mohn, "Real-time analysis of delta¹³C- and delta D-CH₄ in ambient air with laser spectroscopy: method development and first intercomparison results," Atmospheric Measurement Techniques 9, 263-280 (2016).

Juris Meija, Tyler B. Coplen, Michael Berglund, Willi A. Brand, Paul De Bièvre, Manfred Gröning, Norman E. Holden, Johanna Irrgeher, Robert D. Loss, Thomas Walczyk, and Thomas Prohaska, "Atomic weights of the elements 2013 (IUPAC Technical Report)," Pure and Applied Chemistry 88 (3), 265-291 (2016).

Juris Meija, Tyler B. Coplen, Michael Berglund, Willi A. Brand, Paul De Bièvre, Manfred Gröning, Norman E. Holden, Johanna Irrgeher, Robert D. Loss, Thomas Walczyk, and Thomas Prohaska, "Isotopic compositions of the elements 2013 (IUPAC Technical Report)," Pure and Applied Chemistry 88 (3), 293-306 (2016).

Joachim Mohn, Wilhelm Gutjahr, Sakae Toyoda, Eliza Harris, Erkan Ibraim, Heike Geilmann, Patrick Schleppi, Thomas Kuhn, Moritz F. Lehmann, Charlotte Decock, Roland A. Werner, Naohiro Yoshida, and Willi A. Brand, "Reassessment of the NH₄NO₃ thermal decomposition technique for calibration of the N₂O isotopic composition," Rapid Communications in Mass Spectrometry 30 (23), 2487-2496 (2016).

Haiping Qi, Tyler B. Coplen, Stanley J. Mroczkowski, Willi A. Brand, Lauren Brandes, Heike Geilmann, and Arndt Schimmelmann, "A new organic reference material, _L-glutamic acid, USGS41a, for δ¹³C and δ¹⁵N measurements − a replacement for USGS41," Rapid Communications in Mass Spectrometry 30 (7), 859-866 (2016).