Publikationen von Willi A. Brand

Marks, R. G. H.; Jochmann, M. A.; Brand, W. A.; Schmidt, T. C.: How to couple LC-IRMS with HRMS─A proof-of-concept study. Analytical Chemistry 94 (6), S. 2981 - 2987 (2022)

Qi, H.; Moossen, H.; Meijer, H. A.J.; Coplen, T. B.; Aerts-Bijma, A. T.; Reid, L.; Geilmann, H.; Richter, J.; Rothe, M.; Brand, W. A. et al.; Toman, B.; Benefield, J.; Hélie, J.-F.: USGS44, a new high purity calcium carbonate reference material for delta¹³C measurements. Rapid Communications in Mass Spectrometry 35 (4), e9006 (2021)

Sperlich, P.; Moossen, H.; Geilmann, H.; Bury, S. J.; Brown, J. C.S.; Moss, R. C.; Brailsford, G. W.; Brand, W. A.: 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)

Greule, M.; Moossen, H.; Lloyd, M. K.; Geilmann, H.; Brand, W. A.; Eiler, J. M.; Qi, H.; Keppler, F.: Three wood isotopic reference materials for delta²H and delta¹³C measurements of plant methoxy groups. Chemical Geology 533, 119428 (2020)

Greule, M.; Moossen, H.; Geilmann, H.; Brand, W. A.; Keppler, F.: Methyl sulfates as methoxy isotopic reference materials for delta¹³C and delta²H measurements. Rapid Communications in Mass Spectrometry 33 (4), S. 343 - 350 (2019)

Koester, D.; Villalobos, I. M. S.; Jochmann, M. A.; Brand, W. A.; Schmidt, a. T. C.: New concepts for the determination of oxidation efficiencies in liquid chromatography isotope ratio mass spectrometry. Analytical Chemistry 91 (8), S. 5067 - 5073 (2019)

Rodionov, A.; Lehndorff, E.; Stremtan, C. C.; Brand, W. A.; Königshoven, H.-P.; Amelung, W.: Spatial microanalysis of natural ¹³C/¹²C abundance in environmental samples using laser ablation-isotope ratio mass spectrometry. Analytical Chemistry 91 (9), S. 6225 - 6232 (2019)

Ostrom, N. E.; Gandhi, H.; Coplen, T. B.; Toyoda, S.; Böhlke, J.K.; Brand, W. A.; Casciotti, K. L.; Dyckmans, J.; Giesemann, A.; Mohn, J. et al.; Well, R.; Yu, L.; Yoshida, N.: 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), S. 1207 - 1214 (2018)

Umezawa, T.; Brenninkmeijer, C. A. M.; Röckmann, T.; van der Veen, C.; Tyler, S. C.; Fujita, R.; Morimoto, S.; Aoki, S.; Sowers, T.; Schmitt, J. et al.; Bock, M.; Beck, J.; Fischer, H.; Michel, S. E.; Vaughn, B. H.; Miller, J. B.; White, J. C.; Brailsford, G.; Schaefer, H.; Sperlich, P.; Brand, W. A.; Rothe, M.; Blunier, T.; Lowry, D.; Fisher, R. E.; Nisbet, E. G.; Rice, A. L.; Bergamaschi, P.; Veidt, C.; Levin, I.: 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), S. 1207 - 1231 (2018)

Mance, D.; Geilmann, H.; Brand, W. A.; Kewitz, T.; Kersten, H.: Changes of ²H and ¹⁸O abundances in water treated with non-thermal atmospheric pressure plasma jet. Plasma Processes and Polymers 14 (10), e1600239 (2017)

Qi, H.; Coplen, T. B.; Gehre, M.; Vennemann, T. W.; Brand, W. A.; Geilmann, H.; Olack, G.; Bindeman, I. N.; Palandri, J.; Huang, L. et al.; Longstaffe, F. J.: New biotite and muscovite isotopic reference materials, USGS57 and USGS58, for δ²H measurements–A replacement for NBS 30. Chemical Geology 467, S. 89 - 99 (2017)

Gehre, M.; Renpenning, J.; Geilmann, H.; Qi, H.; Coplen, T. B.; Kümmel, S.; Ivdra, N.; Brand, W. A.; Schimmelmann, A.: 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), S. 475 - 484 (2017)

Sperlich, P.; Uitslag, N. A. M.; Richter, J. M.; Rothe, M.; Geilmann, H.; van der Veen, C.; Röckmann, T.; Blunier, T.; Brand, W. A.: Development and evaluation of a suite of isotope reference gases for methane in air. Atmospheric Measurement Techniques 9 (8), S. 3717 - 3737 (2016)

Röckmann, T.; Eyer, S.; van der Veen, C.; Popa, M.-E.; Tuzson, B.; Monteil, G.; Houweling, S.; Harris, E.; Brunner, D.; Fischer, H. et al.; Zazzeri, G.; Lowry, D.; Nisbet, E. G.; Brand, W. A.; Necki, J. M.; Emmenegger, L.; Mohn, J.: In situ observations of the isotopic composition of methane at the Cabauw tall tower site. Atmospheric Chemistry and Physics 16, S. 10469 - 10487 (2016)

Brand, W. A.; Rothe, M.; Sperlich, P.; Strube, M.; Wendeberg, M.: 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), S. 1523 - 1539 (2016)

Eyer, S.; Tuzson, B.; Popa, M. E.; van der Veen, C.; Röckmann, T.; Rothe, M.; Brand, W. A.; Fisher, R.; Lowry, D.; Nisbet, E. G. et al.; Brennwald, M. S.; Harris, E.; Zellweger, C.; Emmenegger, L.; Fischer, H.; Mohn, J.: 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, S. 263 - 280 (2016)

Meija, J.; Coplen, T. B.; Berglund, M.; Brand, W. A.; Bièvre, P. D.; Gröning, M.; Holden, N. E.; Irrgeher, J.; Loss, R. D.; Walczyk, T. et al.; Prohaska, T.: Atomic weights of the elements 2013 (IUPAC Technical Report). Pure and Applied Chemistry 88 (3), S. 265 - 291 (2016)

Meija, J.; Coplen, T. B.; Berglund, M.; Brand, W. A.; Bièvre, P. D.; Gröning, M.; Holden, N. E.; Irrgeher, J.; Loss, R. D.; Walczyk, T. et al.; Prohaska, T.: Isotopic compositions of the elements 2013 (IUPAC Technical Report). Pure and Applied Chemistry 88 (3), S. 293 - 306 (2016)

Mohn, J.; Gutjahr, W.; Toyoda, S.; Harris, E.; Ibraim, E.; Geilmann, H.; Schleppi, P.; Kuhn, T.; Lehmann, M. F.; Decock, C. et al.; Werner, R. A.; Yoshida, N.; Brand, W. A.: Reassessment of the NH₄NO₃ thermal decomposition technique for calibration of the N₂O isotopic composition. Rapid Communications in Mass Spectrometry 30 (23), S. 2487 - 2496 (2016)

Qi, H.; Coplen, T. B.; Mroczkowski, S. J.; Brand, W. A.; Brandes, L.; Geilmann, H.; Schimmelmann, A.: 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), S. 859 - 866 (2016)