Thomas Martin Johnson

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Personal profile

Professional Information

Prof. Johnson's group focuses on environmental geochemistry, isotope geochemistry, and hydrogeology.  The group is working to better understand several redox-sensitive contaminant elements, including chromium, selenium, uranium, and mercury.  They develop and use methods for measurement of the stable isotopes of these and other elements as indicators of key geochemical reactions, contamination sources, and past environments on Earth.

The group uses the department's multicollector ICP-MS laboratory constantly to make these measurements and often develops or improves measurement methods. 

Teaching

  • GEOL 117: The Oceans
  • GEOL 118: Natural Disasters
  • GEOL 370/GEOG 370/ESE 320: Water Planet/Water Crisis
  • GEOL 470: Hydrogeology
  • GEOL 562: Isotope Geochemistry
  • GEOL 579: Isotope Hydrogeology

Education

Ph.D., University of California at Berkeley

Office Address

3030A Natural History Building

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Research Output

Equilibrium fractionation and isotope exchange kinetics between aqueous Se(IV) and Se(VI)

Tan, D., Zhu, J. M., Wang, X., Johnson, T. M., Li, S. & Xu, W., May 15 2020, In : Geochimica et Cosmochimica Acta. 277, p. 21-36 16 p.

Research output: Contribution to journalArticle

  • High-Sensitivity Measurement of Cr Isotopes by Double Spike MC-ICP-MS at the 10 ng Level

    Wu, G., Zhu, J. M., Wang, X., Johnson, T. M. & Han, G., Jan 7 2020, In : Analytical chemistry. 92, 1, p. 1463-1469 7 p.

    Research output: Contribution to journalArticle

  • Mass-dependent selenium isotopic fractionation during microbial reduction of seleno-oxyanions by phylogenetically diverse bacteria

    Schilling, K., Basu, A., Wanner, C., Sanford, R. A., Pallud, C., Johnson, T. M. & Mason, P. R. D., May 1 2020, In : Geochimica et Cosmochimica Acta. 276, p. 274-288 15 p.

    Research output: Contribution to journalArticle

  • Measurements of mass-dependent Te isotopic variation by hydride generation MC-ICP-MS

    Wasserman, N. L. & Johnson, T. M., Feb 2020, In : Journal of Analytical Atomic Spectrometry. 35, 2, p. 307-319 13 p.

    Research output: Contribution to journalArticle