Karen Johannesson, Ph.D.

Associate Professor of Geochemistry and Chemical Hydrogeology
Ph.D., 1993, Mackay School of Mines, University of Nevada
Room 205, Geosciences Building
Phone: (817) 272-2980
Fax: (817) 272-2628
E-mail: kjohanne@uta.edu

Associate Editor: Geochimica et Cosmochimica Acta (http://gca.wustl.edu/)

Current Research: (1) Hydrogeochemical Evolution of Arsenic Concentrations and Speciation Along Groundwater Flow Paths: Linking Aqueous and Solid Phase Arsenic Speciation in Sedimentary Aquifers (NSF Hydrologic Sciences, EAR-0510697: http://www.nsf.gov/awardsearch/showAward.do?AwardNumber=0510697); (2) Towards a Hydrochemical Transport Model for Rare Earth Elements in Groundwater Flow Systems: Coupling Field, Laboratory, and Computational Techniques (NSF Hydrologic Sciences, EAR-0538084)

Previous Research: (1) Quantifying Rare Earth Element Transport in Aquifers Using Field, Laboratory, and Numerical Approaches ((NSF Hydrologic Sciences, EAR-0303761; http://www.nsf.gov/awardsearch/showAward.do?AwardNumber=0303761); (2) Investigation of the Solution Complexation Behavior of the Rare Earth Elements with Naturally Occurring Organic Ligands in Natural Terrestrial Waters (NSF Environmental Geochemistry and Biogeochemistry, EAR-0001086; http://www.nsf.gov/awardsearch/showAward.do?AwardNumber=0001086); (3) U.S.-Mexico Planning Visit: Planning Phase for Hydrogeologic and Hydrochemical Investigations (NSF OISE-9912159); (4) Chemical Hydrogeologic Investigations of Groundwaters from Leon Valley, Guanajuato, Mexico (Comision Estatal de Agua y Saneamiento de Guanajuato, with A. Cortes at UNAM); (5) US-Kuwait Cooperative Research: Planning and Preliminary Sampling Phase for Trace Element and Isotopic Geochemical Studies of Coastal Aquifers in Kuwait (NSF OISE-9906113).

Examples of Recent Publications

Johannesson K. H., Hawkins D. L., Jr., and Cortés A. (2006) Do Archean chemical sediments record ancient seawater rare earth element patterns? Geochimica et Cosmochimica Acta 70 (http://www.sciencedirect.com/science?_ob=MImg&_imagekey=B6V66-4HRMV6M-2-P&_cdi=5806&_user=108428&_orig=browse&_coverDate=12%2F07%2F2005&_sk=999999999&view=c&wchp=dGLzVlz-zSkzV&md5=814e02877c520d0e625548d83666dddd&ie=/sdarticle.pdf)

Tang J. and Johannesson K. H. (2006) Controls on the geochemistry of rare earth elements along a groundwater flow path in the Carrizo Sand aquifer, Texas, USA. Chemical Geology 225, 156-171. (http://www.sciencedirect.com/science?_ob=MImg&_imagekey=B6V5Y-4HHWWBP-4-C&_cdi=5799&_user=108428&_orig=browse&_coverDate=01%2F05%2F2006&_sk=997749998&view=c&wchp=dGLbVtb-zSkWW&md5=cf88e9526f68dfcb40fb5a6150a2f06a&ie=/sdarticle.pdf)

Tang J. and Johannesson K. H. (2005) Adsorption of rare earth elements onto Carrizo sand: Experimental investigations and modeling with surface complexation. Geochimica et Cosmochimica Acta 69, 5259-5272.

Johannesson K. H. (2005) Rare Earth Elements in Groundwater Flow Systems. Springer, Dordrecht. (http://www.springeronline.com/sgw/cda/frontpage/0,11855,5-10006-72-37345141-0,00.html)

Johannesson K. H., Cortés A., Ramos Leal J. A., Ramírez A. G., and Durazo J. (2005) Geochemistry of rare earth elements in groundwater from a rhyolite aquifer, central México. In: K. H. Johannesson (ed.) Rare Earth Elements in Groundwater Flow Systems. Springer, (Dordrecht), pp. 187-222.

Tang J. and Johannesson K. H. (2005) Rare earth element concentrations, speciation, and fractionation along groundwater flow paths: The Carrizo Sand (Texas) and Upper Floridan aquifers. In: K. H. Johannesson (ed.) Rare Earth Elements in Groundwater Flow Systems. Springer, (Dordrecht), pp. 223-251.

Shand P., Johannesson K. H., Chudaev O., Chudaeva V., and Edmunds W. M. (2005) Rare earth element contents of high pCO₂ groundwaters of Primorye, Russia: Mineral stability and complexation controls. In: K. H. Johannesson (ed.) Rare Earth Elements in Groundwater Flow Systems. Springer, (Dordrecht), pp. 161-186.

Zhou X., Stetzenbach K. J., Yu Z., and Johannesson K. H. (2005) Origin of rare earth element signatures in groundwaters of south Nevada, USA: Implications from preliminary batch leach tests using aquifer rocks. In: K. H. Johannesson (ed.) Rare Earth Elements in Groundwater Flow Systems. Springer, (Dordrecht), pp. 141-160.

Tang J., Whittecar G. R., Johannesson K. H., and Daniels W. L. (2004) Potential contaminants at a dredged spoil placement site, Charles City County, Virginia, as revealed by sequential extraction. Geochemical Transactions 5, 49- 60.

Johannesson, K. H., Tang, J., Daniels, J. M., Bounds, W. J., and Burdige, D. J., 2004. Rare earth element concentrations and speciation in organic-rich blackwaters of the Great Dismal Swamp, Virginia, USA. Chemical Geology 209, 271-294.

Johannesson K. H., Cortés A., and Kilroy K. C. (2004) Reconnaissance isotopic and hydrochemical study of Cuatro Ciénegas groundwater, Coahuila, México. Journal of South American Earth Sciences, in press. (uncorrected proof)

Tang J. and Johannesson K. H. (2003) Speciation of rare earth elements in natural terrestrial waters: Assessing the role of dissolved organic matter from the modeling approach. Geochimica et Cosmochimica Acta 67, 2321-2339.

Ojiambo S. B., Lyons W. B., Welch K. A., Poreda R. J., and Johannesson K. H. (2003) Strontium isotopes and rare earth elements as tracers of groundwater – lake water interactions, Lake Naivasha, Kenya. Applied Geochemistry 18, 1789-1805.

Farnham I. M., Johannesson K. H., Singh A. K., Hodge V. F., and Stetzenbach K. J. (2003) Factor analytical approaches for evaluating groundwater trace element chemistry data. Analytica Chimica Acta 490, 123-138.

Stetzenbach K. J., Hodge V. F., Guo C., Farnham I. M. and Johannesson K. H. (2001). Geochemical and statistical evidence of deep carbonate groundwater within overlying volcanic rock aquifers/aquitards of southern Nevada, USA. Journal of Hydrology 243, 254-271.

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