Thomas Martin Johnson

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2020

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

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

2018

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

2016

A cenozoic seawater redox record derived from 238U/235U in ferromanganese crusts

Wang, X., Planavsky, N. J., Reinhard, C. T., Hein, J. R. & Johnson, T. M., Jan 2016, In : American Journal of Science. 315, 11, p. 64-83 20 p.

Research output: Contribution to journalArticle

Geological evolution of the marine selenium cycle: Insights from the bulk shale δ82/76Se record and isotope mass balance modeling

Mitchell, K., Mansoor, S. Z., Mason, P. R. D., Johnson, T. M. & Van Cappellen, P., May 1 2016, In : Earth and Planetary Science Letters. 441, p. 178-187 10 p.

Research output: Contribution to journalArticle

Reactive transport of uranium in a groundwater bioreduction study: Insights from high-temporal resolution 238U/235U data

Shiel, A. E., Johnson, T. M., Lundstrom, C. C., Laubach, P. G., Long, P. E. & Williams, K. H., Aug 15 2016, In : Geochimica et Cosmochimica Acta. 187, p. 218-236 19 p.

Research output: Contribution to journalArticle

Sedimentary chromium isotopic compositions across the Cretaceous OAE2 at Demerara Rise Site 1258

Wang, X., Reinhard, C. T., Planavsky, N. J., Owens, J. D., Lyons, T. W. & Johnson, T. M., Jul 1 2016, In : Chemical Geology. 429, p. 85-92 8 p.

Research output: Contribution to journalArticle

Se Isotopes as Groundwater Redox Indicators: Detecting Natural Attenuation of Se at an in Situ Recovery U Mine

Basu, A., Schilling, K., Brown, S. T., Johnson, T. M., Christensen, J. N., Hartmann, M., Reimus, P. W., Heikoop, J. M., WoldeGabriel, G. & DePaolo, D. J., Oct 18 2016, In : Environmental Science and Technology. 50, 20, p. 10833-10842 10 p.

Research output: Contribution to journalArticle

Uranium isotopic fractionation induced by U(VI) adsorption onto common aquifer minerals

Jemison, N. E., Johnson, T. M., Shiel, A. E. & Lundstrom, C. C., Jan 1 2016, In : Environmental Science and Technology. 50, 22, p. 12232-12240 9 p.

Research output: Contribution to journalArticle

2015

Equilibrium isotopic fractionation and isotopic exchange kinetics between Cr(III) and Cr(VI)

Wang, X., Johnson, T. M. & Ellis, A. S., Mar 5 2015, In : Geochimica et Cosmochimica Acta. 153, p. 72-90 19 p.

Research output: Contribution to journalArticle

Fate of Selenium in Soils at a Seleniferous Site Recorded by High Precision Se Isotope Measurements

Schilling, K., Johnson, T. M., Dhillon, K. S. & Mason, P. R. D., Jul 15 2015, In : Environmental Science and Technology. 49, 16, p. 9690-9698 9 p.

Research output: Contribution to journalArticle

Isotope fractionation during oxidation of tetravalent uranium by dissolved oxygen

Wang, X., Johnson, T. M. & Lundstrom, C. C., Feb 1 2015, In : Geochimica et Cosmochimica Acta. 150, p. 160-170 11 p.

Research output: Contribution to journalArticle

2014

A sequential extraction technique for mass-balanced stable selenium isotope analysis of soil samples

Schilling, K., Johnson, T. M. & Mason, P. R. D., Aug 14 2014, In : Chemical Geology. 381, p. 125-130 6 p.

Research output: Contribution to journalArticle

Coupled iron, sulfur and carbon isotope evidences for arsenic enrichment in groundwater

Wang, Y., Xie, X., Johnson, T. M., Lundstrom, C. C., Ellis, A., Wang, X., Duan, M. & Li, J., Nov 7 2014, In : Journal of Hydrology. 519, PA, p. 414-422 9 p.

Research output: Contribution to journalArticle

Cr isotope fractionation factors for Cr(VI) reduction by a metabolically diverse group of bacteria

Basu, A., Johnson, T. M. & Sanford, R. A., Oct 1 2014, In : Geochimica et Cosmochimica Acta. 142, p. 349-361 13 p.

Research output: Contribution to journalArticle

Evidence for oxygenic photosynthesis half a billion years before the Great Oxidation Event

Planavsky, N. J., Asael, D., Hofmann, A., Reinhard, C. T., Lalonde, S. V., Knudsen, A., Wang, X., Ossa Ossa, F., Pecoits, E., Smith, A. J. B., Beukes, N. J., Bekker, A., Johnson, T. M., Konhauser, K. O., Lyons, T. W. & Rouxel, O. J., Apr 2014, In : Nature Geoscience. 7, 4, p. 283-286 4 p.

Research output: Contribution to journalArticle

Isotopic evidence for reduction of anthropogenic hexavalent chromium in Los Alamos National Laboratory groundwater

Heikoop, J. M., Johnson, T. M., Birdsell, K. H., Longmire, P., Hickmott, D. D., Jacobs, E. P., Broxton, D. E., Katzman, D., Vesselinov, V. V., Ding, M., Vaniman, D. T., Reneau, S. L., Goering, T. J., Glessner, J. & Basu, A., May 12 2014, In : Chemical Geology. 373, p. 1-9 9 p.

Research output: Contribution to journalArticle

Pathways of arsenic from sediments to groundwater in the hyporheic zone: Evidence from an iron isotope study

Xie, X., Johnson, T. M., Wang, Y., Lundstrom, C. C., Ellis, A., Wang, X., Duan, M. & Li, J., Apr 16 2014, In : Journal of Hydrology. 511, p. 509-517 9 p.

Research output: Contribution to journalArticle

Selenium redox cycling during weathering of Se-rich shales: A selenium isotope study

Zhu, J. M., Johnson, T. M., Clark, S. K., Zhu, X. K. & Wang, X. L., Feb 1 2014, In : Geochimica et Cosmochimica Acta. 126, p. 228-249 22 p.

Research output: Contribution to journalArticle

The isotopic composition of authigenic chromium in anoxic marine sediments: A case study from the Cariaco Basin

Reinhard, C. T., Planavsky, N. J., Wang, X., Fischer, W. W., Johnson, T. M. & Lyons, T. W., Dec 1 2014, In : Earth and Planetary Science Letters. 407, p. 9-18 10 p.

Research output: Contribution to journalArticle

Uranium isotopic fractionation factors during U(VI) reduction by bacterial isolates

Basu, A., Sanford, R. A., Johnson, T. M., Lundstrom, C. C. & Löffler, F. E., May 2014, In : Geochimica et Cosmochimica Acta. 136, p. 100-113 14 p.

Research output: Contribution to journalArticle

2013

Environmental impacts of the Tennessee Valley Authority Kingston coal ash Spill. 1. Source apportionment using mercury stable isotopes

Bartov, G., Deonarine, A., Johnson, T. M., Ruhl, L., Vengosh, A. & Hsu-Kim, H., Feb 19 2013, In : Environmental Science and Technology. 47, 4, p. 2092-2099 8 p.

Research output: Contribution to journalArticle

Environmental impacts of the Tennessee Valley Authority Kingston coal ash spill. 2. effect of coal ash on methylmercury in historically contaminated river sediments

Deonarine, A., Bartov, G., Johnson, T. M., Ruhl, L., Vengosh, A. & Hsu-Kim, H., Feb 19 2013, In : Environmental Science and Technology. 47, 4, p. 2100-2108 9 p.

Research output: Contribution to journalArticle

Isotope fractionation of selenium by biomethylation in microcosm incubations of soil

Schilling, K., Johnson, T. M. & Wilcke, W., Aug 16 2013, In : Chemical Geology. 352, p. 101-107 7 p.

Research output: Contribution to journalArticle

Mobilization of arsenic in aquifers from the Datong Basin, China: Evidence from geochemical and iron isotopic data

Xie, X., Johnson, T. M., Wang, Y., Lundstrom, C. C., Ellis, A., Wang, X. & Duan, M., Feb 1 2013, In : Chemosphere. 90, 6, p. 1878-1884 7 p.

Research output: Contribution to journalArticle

No measurable changes in 238U/235U due to desorption-adsorption of U(VI) from groundwater at the Rifle, Colorado, integrated field research challenge site

Shiel, A. E., Laubach, P. G., Johnson, T. M., Lundstrom, C. C., Long, P. E. & Williams, K. H., Mar 19 2013, In : Environmental Science and Technology. 47, 6, p. 2535-2541 7 p.

Research output: Contribution to journalArticle

Selenium sorption and isotope fractionation: Iron(III) oxides versus iron(II) sulfides

Mitchell, K., Couture, R. M., Johnson, T. M., Mason, P. R. D. & Van Cappellen, P., Mar 9 2013, In : Chemical Geology. 342, p. 21-28 8 p.

Research output: Contribution to journalArticle

Unique Hg stable isotope signatures of compact fluorescent lamp-sourced Hg

Mead, C., Lyons, J. R., Johnson, T. M. & Anbar, A. D., Mar 19 2013, In : Environmental Science and Technology. 47, 6, p. 2542-2547 6 p.

Research output: Contribution to journalArticle

2012

Chromium isotope fractionation factors for reduction of Cr(VI) by aqueous Fe(II) and organic molecules

Kitchen, J. W., Johnson, T. M., Bullen, T. D., Zhu, J. & Raddatz, A., Jul 15 2012, In : Geochimica et Cosmochimica Acta. 89, p. 190-201 12 p.

Research output: Contribution to journalArticle

Geochemistry and Cr stable isotopes of Cr-contaminated groundwater in León valley, Guanajuato, México

Villalobos-Aragón, A., Ellis, A. S., Armienta, M. A., Morton-Bermea, O. & Johnson, T. M., Sep 1 2012, In : Applied Geochemistry. 27, 9, p. 1783-1794 12 p.

Research output: Contribution to journalArticle

Selenium as paleo-oceanographic proxy: A first assessment

Mitchell, K., Mason, P. R. D., Van Cappellen, P., Johnson, T. M., Gill, B. C., Owens, J. D., Diaz, J., Ingall, E. D., Reichart, G. J. & Lyons, T. W., Jul 15 2012, In : Geochimica et Cosmochimica Acta. 89, p. 302-317 16 p.

Research output: Contribution to journalArticle

The occurrence and origin of selenium minerals in Se-rich stone coals, spoils and their adjacent soils in Yutangba, China

Zhu, J. M., Johnson, T. M., Finkelman, R. B., Zheng, B. S., Sýkorová, I. & Pešek, J., Nov 10 2012, In : Chemical Geology. 330-331, p. 27-38 12 p.

Research output: Contribution to journalArticle

2011

Cr stable isotopes in snake river plain aquifer groundwater: Evidence for natural reduction of dissolved Cr(VI)

Raddatz, A. L., Johnson, T. M. & McLing, T. L., Jan 15 2011, In : Environmental Science and Technology. 45, 2, p. 502-507 6 p.

Research output: Contribution to journalArticle

Isotope fractionation of selenium during fungal biomethylation by alternaria alternata

Schilling, K., Johnson, T. M. & Wilcke, W., Apr 1 2011, In : Environmental Science and Technology. 45, 7, p. 2670-2676 7 p.

Research output: Contribution to journalArticle

Selenium partitioning and stable isotope ratios in urban topsoils

Schilling, K., Johnson, T. M. & Wilcke, W., Jul 1 2011, In : Soil Science Society of America Journal. 75, 4, p. 1354-1364 11 p.

Research output: Contribution to journalArticle

2010

Cr stable isotopes as indicators of Cr(VI) reduction in groundwater: A detailed time-series study of a point-source plume

Berna, E. C., Johnson, T. M., Makdisi, R. S. & Basu, A., Feb 1 2010, In : Environmental Science and Technology. 44, 3, p. 1043-1048 6 p.

Research output: Contribution to journalArticle

Hg stable isotope analysis by the double-spike method

Mead, C. & Johnson, T. M., Jun 1 2010, In : Analytical and bioanalytical chemistry. 397, 4, p. 1529-1538 10 p.

Research output: Contribution to journalArticle

Les métaux dans les particules atmosphériques: Les isotopes peuvent-ils aider à discriminer les pôles d'émission potentiels?

Translated title of the contribution: Metals in atmospheric particles: Can isotopes help discriminate potential sources?Widory, D., Petelet-Giraud, E., Bihan, O. L., Moullec, Y. L., Quetel, C., Snell, J., Van Bocxstaele, M., Hure, A., Canard, E., Joos, E., Forti, L., Bullen, T., Johnson, T. M. & Fiani, E., Nov 22 2010, In : Pollution Atmospherique. NUMERO SPECIAL, p. 75-82 8 p.

Research output: Contribution to journalArticle

2009

Variation in strontium isotope ratios of archaeological fauna in the Midwestern United States: a preliminary study

Hedman, K. M., Curry, B. B., Johnson, T. M., Fullagar, P. D. & Emerson, T. E., Jan 2009, In : Journal of Archaeological Science. 36, 1, p. 64-73 10 p.

Research output: Contribution to journalArticle

Variations in 238U/235U in uranium ore deposits: Isotopic signatures of the U reduction process?

Bopp IV, C. J., Lundstrom, C. C., Johnson, T. M. & Glessner, J. J. G., Sep 8 2009, In : Geology. 37, 7, p. 611-614 4 p.

Research output: Contribution to journalArticle