Dr. Peter H. Santschi

Dr. Peter H.Santschi
Regents Professor
Department of Marine Sciences
1001 Texas Clipper Rd
Bld# 3029, Office 346

Galveston, TX, 77554 USA

E-mail: santschi@tamug.edu
Phone: (409) 740-4476
Fax: (409) 740-4429
Website: loer.tamug.edu/Santschi_Research/

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Ph.D. Chemistry, University of Berne, Switzerland, 1975
M.S. Chemistry, University of Berne, Switzerland, 1971
B.S. Gymnasium Berne, Switzerland, Matura 1963

Research Interests:

A broad range of topics in Chemical Oceanography, Limnology and Hydrology, including tracer applications using radioactive and stable isotopes, relationships between trace element and natural organic matter geochemistry, and importance of exopolymeric substances for pollutants, e.g., oil and trace element, binding and removal from natural waters. Recent work centered on relationships between natural organic matter compounds, e.g., exopolymeric substances, aromatic compounds, or hydroxamate siderophores, and actinide elements, 129I, a number of trace and ultra-trace elements, PCBs, dioxins, oil and corexit.

Courses Taught:

Texas A&M University (Graduate):
"Isotope Geochemistry"
“Seminar in Oceanography/Marine Science”
“Dynamics of Environmental Colloids”

Texas A&M University at Galveston (Undergraduate):
"Environmental Chemistry"
“Nuclear Chemistry”
"Chemical Oceanography"
"Geological Oceanography"
"Environmental Geology"
 Swiss Institute of Technology (ETH) in Zurich, Switzerland:
"Geochemical Oceanography"
"Radioactivity in the Environment"
“Environmental Colloids”

Hong Kong University of Science and Technology:
"Marine Organic Chemistry"
"Marine Colloids Chemistry"
"Marine Radiochemistry"

Recent Publications since 2014

Kaplan, D.I., Zhang, S., Roberts, K.A., Schwehr, K.A., Xu, C., Creeley, D., Ho, Y.-F., Li, H.-P., Yeager, C.M., and Peter H. Santschi, P.H. 2014. Radioiodine concentrated in a wetland. J. Environmental Radioactivity, 131, 57-61.

Li, H.-P., Daniel, B., Creeley, D., Grandbois, R., Zhang, S., Xu, C., Ho, Y.-F., Schwehr, K.A., Kaplan, D.I., Santschi, P.H., Hansel, C., Yeager, C.M. 2014. Superoxide production by a manganese-oxidizing bacterium facilitates iodide oxidation. Applied and Environmental Microbiology, 80(9), 2693-2699.

Xu, C., Athon, M., Ho, Y.-F., Chang, H.-S., Zhang, S., Kaplan, D.I., Schwehr, K.A., DiDonato, N., Hatcher, P.G., Santschi, P.H. 2014. Plutonium Immobilization and Re-mobilization by Soil Mineral and Organic Matter in the Far-field of the Savannah River Site, USA. ES&T, 48, 3186-3195.

Emerson, H.P., Xu, C., Ho, Y.-F., Zhang, S., Schwehr, K.A., Lilley, M., Kaplan, D.I., Santschi, P.H., and Powell, B.A. 2014. Geochemical controls of iodine transport in Savannah River Site subsurface environments. Applied Geochem., 45, 105–113.

Chuang, C.-Y., Santschi, P.H., Jiang, Y., Ho, Y.-F., Quigg, A., Guo, L.D.,, Ayranov, M., Schumann, D. 2014. Important role of diatoms in the scavenging of particle reactive radionuclides, Thorium, Protactinium, Lead, Polonium and Beryllium, in the ocean: a case study with Phaeodactylum tricornutum. Limnol. Oceanogr., 59(4), 1256–1266.

Chang, H.-S., Xu, C., Schwehr, K.A., Zhang, S., Kaplan, D.I., Seaman, J.C., Yeager, C., and Santschi, P.H. 2014. Model of Radioiodine Speciation and Partitioning in Organic-rich and Organic-poor Soils from the Savannah River Site. Journal of Environmental Chemical Engineering, 2, 1321-1330.

Kaplan, D. I., M. E. Denham, S. Zhang, C. Yeager, C. Xu, K. A. Schwehr, H. P. Li, Y. F. Ho, D. Wellman, and P. H. Santschi. 2014. Radioiodine Biogeochemistry and Prevalence in Groundwater. Critical Reviews of Environmental Science and Technology, 44(20), 2287-2335.

Hung, C.-C., Ko, F.-C., Gong, G.-C., Wu, J.-M., Chiang, H.-L., Peng, S.-C., Santschi, P.H. 2014. Changes in zooplankton PAH concentrations across hydrographic fronts in the East China Sea. Marine Pollution Bulletin, 83(1), 248–257.

Hung, C.-C., Gong, G.C., Lee, M.A., Liao, C.H., Chang, Y ., Shih, Y.Y., Chen, K.S., Chen, M.-H., Santschi, P.H. 2014. Impacts of Typhoons on Nutrient Supply and Potential Fish Production in the Southern East China Sea. Typhoon Impact and Crisis Management, 267-282.

Schwehr, K.A., Otosaka, S., Merchel, S., Kaplan, D.I., Zhang, S., Xu, C., Li, H.-P., Ho, Y.-F., Yeager, C.M., Santschi, P.H., ASTER Team. 2014. Speciation of iodine isotopes inside and outside of a contaminant plume at the Savannah River Site. Science of the Total Environment, 497–498, 671–678.

Zhang, S., Ho, Y.-F., Creeley, D., Roberts, K.A., Xu, C., Li, H.-P., Schwehr, K.A., Kaplan, D.I., Yeager, C.M., and Santschi, P.H. 2014. Temporal Variation of Iodine Concentration and Speciation (127I and 129I) in Wetland Groundwater from the Savannah River Site, USA. Environ. Sci. Technol., 48, 11218-11226.

Xu, C., Zhang, S., Athon, M., Ho, Y.-F., Li, H.-P., Grandbois, R., Schwehr, K.A., Kaplan, D.I., Yeager, C.M., Wellman, D., Santschi, P.H. 2015. A Re-evaluation of Radioiodine Transformation and Migration in the subsurface of Hanford Site. J. Env. Radioactivity, 139, 43-55.

Chuang, C.-Y., Santschi, P.H., Wen, L.S., Xu, C., Zhang, S., Ho, Y.-F., Schwehr, K.A., Jiang, Y., Ho, Y.F., Schwehr, K.A., Quigg, A., Hung, C.-C., Guo, L.D.,, Ayranov, M., Schumann, D. 2015. Binding of Th, Pa, Pb, Po and Be radionuclides to marine colloidal macromolecular organic matter. Marine Chemistry, 173, 320–329.

Lam, P.J., Twining, B.S., Jeandel, C., Roychoudhury, A., Resing, J., Geibert, W., Santschi, P.H., Anderson, R.F. 2015. Methods for analyzing the concentration and speciation of major and trace elements in marine particles. Progress in Oceanography, 133, 32–42.

Yang, W.F., Guo, L.D., Chuang, C.-Y., Santschi, P.H., Schumann, D., Ayranov, M. 2015. Influence of macromolecular organic matter on the adsorption of 210Pb, 210Po and 7Be on nanoparticles in seawater. Earth and Planetary Science Letters 423, 193–201.

Chuang, C.-Y., Santschi, P.H., Ho, Y.-F., Chen Xu, C., Jiang, Y., Quigg, A., Guo, L.D., Hatcher, P.G., Ayranov, M., Schumann, D. 2015. Molecular level characterization of diatom associated biopolymers that bind 234Th, 233Pa, 210Pb, and 7Be in seawater: a case study with Phaeodactylum tricornutum. J. Geophys. Res. Biogeosci., 120, 9, 1858-1869.

Xu, C., Zhang, S., Kaplan, D.I., Ho, Y.-F. , Schwehr, K.A., Roberts, K.A., Chen, H.M., Didonato, N., Athon, M., Hatcher, P.G., Santschi, P.H. 2015. Evidence for Hydroxamate Siderophores and Other N-Containing Organic Compounds Controlling 239,240Pu Immobilization and Remobilization in a Wetland Sediment. Environ. Sci. Technol., 49, 11458-11467.

Jiann, K.-T., Wen, L.-S., and Santschi, P.H. 2016. Clean sampling and analysis of river and estuarine waters for trace metal studies. J. Vis. Exp.,e54073, doi:10.3791/54073; http://www.jove.com/video/54073; doi:10.3791/54073.

Xu, C., Zhang, S., Sugiyama, Y., Nobuhito Ohte. N., Ho, Y.-F., Fujitake, N., Kaplan, D.I., Yeager, C.M., Kathleen Schwehr, K.A., Santschi, P.H. 2016. Factors controlling iodine and 239,240Pu concentrations and mobility in soils from the Northwestern Fukushima Prefecture, Japan. Journal of Environmental Radioactivity 153, 156-166.

Kaplan, D.I., Xu, C., Huang, S., Lin, Y.M., Tolic, N., Roscioli-Johnson, K.M., Santschi, P.H., and Jaffé, P.R. 2016. Unique Organic Matter and Microbial Properties in the Rhizosphere of a Wetland Soil. Environ. Sci. Technol., 50, 4169–4177 (DOI: 10.1021/acs.est.5b05165).

Hieke, A.-S.C., Brinkmeyer, R., Yeager, K.M., Schindler, K.J., Zhang, S., Xu, C., Louchouarn, P., Santschi, P.H. 2016. Widespread distribution of Dehalococcoides spp. in the Houston Ship Channel and Galveston Bay, Texas, sediments and the potential for reductive dechlorinaton of PCDD/F in an estuarine environment. Marine Biotechnology 18, 6, 630–644; doi:10.1007/s10126-016-9723-7.

Quigg, A., Passow, U., Chin, W.-C., Bretherton, L., Kamalanathan, M., Xu, C., Schwehr, K.A., Zhang, S., Sun, L., Wade, T.L., Finkel, Z.V., Doyle, S., Sylvan, J.B., Williams, A.K., Obeid, W., Hatcher, P.G., Knap, A.H., Santschi, P.H. 2016. Chemical and microbial Controls of Aggregation and Degradation of Oil and Dispersants by Microbial Exopolymers., L&O Letters, 1, 2016, 3–26.

Santschi, P.H., Xu, C., Zhang, S., Schwehr, K.A., Grandbois, R., Kaplan, D., Yeager, C. 2016. Iodine and Plutonium Association with Natural Organic Matter: A Review of Recent Advances. Applied Geochemistry, doi: 10.1016/j.apgeochem.2016.11.009.

Santschi, P.H., Xu, C., Zhang, S., Schwehr, Lin, P., K.A., Yeager, C.M., and Kaplan, D.I. 2017. Recent advances in the detection of specific natural organic compounds as carriers for radionuclides in soil and water environments, with examples of radioiodine and plutonium. Journal of Environmental Radioactivity, 171, 226-233.

DiDonato, N., Xu, C., Santschi, P.H., and Hatcher, P.G. 2017. A new perspective on structural components of Pu-mobilizing organic colloids from a contaminated soil. ES&T, 51, 4803-4811; DOI: 10.1021/acs.est.6b04955.

Santschi, P.H., Yeager, K.M., Schwehr, K.A., Schindler, K. 2017.  Estimates of recovery of the Penobscot River Estuarine System from mercury contamination in the 1960’s. STOTEN, 596–597, 351–359; http://dx.doi.org/10.1016/j.scitotenv.2017.04.094.

Athon, M.T., Santschi, P.H., Fryxell, G.E., Chuang, C.-Y. 2017. Sorption of selected radionuclides (e.g. 7Be, 57Co, 106Ru, 125Sb, 133Ba, 137Cs, 210Pb, 210Po, 233Pa, and 234Th) on different MnO2 phases. Environmental Chemistry, 14, 207-214. http://dx.doi.org/10.1071/EN17026.

Sun, L., Xu, C., Chin, W.C., Zhang, S., Lin, P., Schwehr, K.A., Quigg, A., Chiu, M.-H., Chin, W.-C., Santschi, P.H. 2017. Light-induced aggregation of microbial exopolymeric substances. Chemosphere 181, 675-681, doi: 10.1016/j.chemosphere.2017.04.099.

Chiu, M.-H., Garcia, S.G., Hwang, B., Claiche, D., Sanchez, G., Aldayafleh, R., Tsai, S.-M., Santschi, P.H., Quigg, A., Chin, W.-C. 2017. Corexit, Oil and Marine Microgels. Marine Pollution Bulletin 122, 376-378.

Grandbois, R., Yeager C.M., Tani, Y., Xu, C., Zhang, S., Beaver, M., Schwehr, K.A., Kaplan, D.I., and Santschi, P.H., 2017. Biogenic manganese oxides facilitate iodine oxidation at low pH. Geomicrobiology, accepted.

Zhao, Y., Wang, Y., Santschi, P.H., and Quigg, A. 2017. Response of the antioxidant defense system of two microalgal species (Alexandrium minutum and Dunaliella salina) to the toxicity of BDE-47. Mar. Poll. Bulletin, accepted.

Lin, P., Xu, C., Zhang, S., Sun, L., Schwehr, K.A., Bretherton, L., Quigg, A., Peter H. Santschi, P.H. 2017. Partitioning of natural radionuclide analogues for particle cycling in the ocean (234Th, 233Pa, 210Pb, 210Po and 7Be) with biopolymers associated with coccolithophores: a case study with Emiliania huxleyi. Journal of Geophysical Research: Biogeosciences, accepted.

Yeager, C.M., Amachi, S., Grandbois, R., Kaplan, D.I., Xu, C., Schwehr, K.A., and Santschi, P.H. 2017. Microbial transformation of iodine: From radioisotopes to iodine deficiency. Advances in Applied Microbiology, 101, http://dx.doi.org/10.1016/bs.aambs.2017.07.002.

Lin, P., Xu, C., Zhang, S., Fujitake, N., Kaplan, D.I., Yeager, C.M., Sugiyama, Y., Schwehr, K.A., Santschi, P.H. 2017. Evidence for carboxyl-associated and nitrogen-containing organic compounds regulating the remobilization of plutonium in natural soils. Env. Sci. Technol., in press.


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