Thomas Martin Johnson

1987 …2020

Research output per year

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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

  • Microbial U Isotope Fractionation Depends on the U(VI) Reduction Rate

    Basu, A., Wanner, C., Johnson, T. M., Lundstrom, C. C., Sanford, R. A., Sonnenthal, E. L., Boyanov, M. I. & Kemner, K. M., Feb 18 2020, In : Environmental Science and Technology. 54, 4, p. 2295-2303 9 p.

    Research output: Contribution to journalArticle

  • Selenium isotope fractionation during adsorption by Fe, Mn and Al oxides

    Xu, W., Zhu, J. M., Johnson, T. M., Wang, X., Lin, Z. Q., Tan, D. & Qin, H., Mar 1 2020, In : Geochimica et Cosmochimica Acta. 272, p. 121-136 16 p.

    Research output: Contribution to journalArticle

  • A Mesoarchean shift in uranium isotope systematics

    Wang, X., Planavsky, N. J., Hofmann, A., Saupe, E. E., De Corte, B. P., Philippot, P., LaLonde, S. V., Jemison, N. E., Zou, H., Ossa, F. O., Rybacki, K., Alfimova, N., Larson, M. J., Tsikos, H., Fralick, P. W., Johnson, T. M., Knudsen, A. C., Reinhard, C. T. & Konhauser, K. O., Oct 1 2018, In : Geochimica et Cosmochimica Acta. 238, p. 438-452 15 p.

    Research output: Contribution to journalArticle

  • Field Application of 238U/235U Measurements to Detect Reoxidation and Mobilization of U(IV)

    Jemison, N. E., Shiel, A. E., Johnson, T. M., Lundstrom, C. C., Long, P. E. & Williams, K. H., Mar 20 2018, In : Environmental Science and Technology. 52, 6, p. 3422-3430 9 p.

    Research output: Contribution to journalArticle