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Schwehr, Kathleen Lecturer
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Overview
Publications
selected publications
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academic article
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Kamalanathan, M., Schwehr, K. A., Labonté, J. M., Taylor, C., Bergen, C., Patterson, N., ... Quigg, A.
(2021).
The Interplay of Phototrophic and Heterotrophic Microbes Under Oil Exposure: A Microcosm Study. FRONTIERS IN MICROBIOLOGY.
12, 675328.
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Bacosa, H. P., Kamalanathan, M., Cullen, J., Shi, D., Xu, C., Schwehr, K. A., ... Quigg, A.
(2020).
Marine Snow Aggregates are Enriched in Polycyclic Aromatic Hydrocarbons (PAHs) in Oil Contaminated Waters: Insights from a Mesocosm Study. Journal of Marine Science and Engineering.
8(10), 781-781.
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Santschi, P. H., Xu, C., Schwehr, K. A., Lin, P., Sun, L., Chin, W., ... Quigg, A.
(2020).
Can the protein/carbohydrate (P/C) ratio of exopolymeric substances (EPS) be used as a proxy for their ‘stickiness’ and aggregation propensity?. Marine Chemistry.
218, 103734-103734.
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Lin, P., Xu, C., Xing, W., Sun, L., Schwehr, K. A., Quigg, A., & Santschi, P. H.
(2020).
Partitioning of iron and plutonium to exopolymeric substances and intracellular biopolymers: A comparison study between the coccolithophore Emiliania huxleyi and the diatom Skeletonema costatum. Marine Chemistry.
218, 103735-103735.
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Li, D., Xu, C., Yeager, C. M., Lin, P., Xing, W., Schwehr, K. A., ... Santschi, P. H.
(2019).
Molecular Interaction of Aqueous Iodine Species with Humic Acid Studied by I and C K-Edge X-ray Absorption Spectroscopy. ENVIRONMENTAL SCIENCE & TECHNOLOGY.
53(21), 12416-12424.
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Xu, C., Lin, P., Zhang, S., Sun, L., Xing, W., Schwehr, K. A., ... Santschi, P. H.
(2019).
The interplay of extracellular polymeric substances and oil/Corexit to affect the petroleum incorporation into sinking marine oil snow in four mesocosms. Science of the Total Environment.
693, 133626-133626.
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Xu, C., Chin, W., Lin, P., Chen, H., Chiu, M., Waggoner, D. C., ... Santschi, P. H.
(2019).
Comparison of microgels, extracellular polymeric substances (EPS) and transparent exopolymeric particles (TEP) determined in seawater with and without oil. Marine Chemistry.
215, 103667-103667.
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Lin, P., Xu, C., Kaplan, D. I., Chen, H., Yeager, C. M., Xing, W., ... Santschi, P. H.
(2019).
Nagasaki sediments reveal that long-term fate of plutonium is controlled by select organic matter moieties. Science of the Total Environment.
678, 409-418.
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Kaplan, D. I., Price, K. A., Xu, C., Li, D., Lin, P., Xing, W., ... Santschi, P. H.
(2019).
Iodine speciation in a silver-amended cementitious system. Environ Int.
126, 576-584.
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Kaplan, D. I., Xu, C., Li, D., Lin, P., Xing, W., Nichols, R., Schwehr, K., & Santschi, P. H.
(2019).
Iodine speciation in cementitious environments. APPLIED GEOCHEMISTRY.
103, 15-22.
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Wozniak, A. S., Prem, P. M., Obeid, W., Waggoner, D. C., Quigg, A., Xu, C., ... Hatcher, P. G.
(2019).
Rapid Degradation of Oil in Mesocosm Simulations of Marine Oil Snow Events. ENVIRONMENTAL SCIENCE & TECHNOLOGY.
53(7), 3441-3450.
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Sun, L., Chin, W., Chiu, M., Xu, C., Lin, P., Schwehr, K. A., Quigg, A., & Santschi, P. H.
(2019).
Sunlight induced aggregation of dissolved organic matter: Role of proteins in linking organic carbon and nitrogen cycling in seawater. Science of the Total Environment.
654, 872-877.
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Bacosa, H. P., Kamalanathan, M., Chiu, M., Tsai, S., Sun, L., Labonté, J. M., ... Quigg, A.
(2018).
Extracellular polymeric substances (EPS) producing and oil degrading bacteria isolated from the northern Gulf of Mexico. PLoS One.
13(12), e0208406-e0208406.
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Xu, C., Zhang, S., Beaver, M., Wozniak, A., Obeid, W., Lin, Y., ... Santschi, P. H.
(2018).
Decreased sedimentation efficiency of petro- and non-petro-carbon caused by a dispersant for Macondo surrogate oil in a mesocosm simulating a coastal microbial community. Marine Chemistry.
206, 34-43.
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Schwehr, K. A., Xu, C., Chiu, M., Zhang, S., Sun, L., Lin, P., ... Santschi, P. H.
(2018).
Protein: Polysaccharide ratio in exopolymeric substances controlling the surface tension of seawater in the presence or absence of surrogate Macondo oil with and without Corexit. Marine Chemistry.
206, 84-92.
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Xu, C., Zhang, S., Beaver, M., Lin, P., Sun, L., Doyle, S. M., ... Santschi, P. H.
(2018).
The role of microbially-mediated exopolymeric substances (EPS) in regulating Macondo oil transport in a mesocosm experiment. Marine Chemistry.
206, 52-61.
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Yeager, K. M., Schwehr, K. A., Schindler, K. J., & Santschi, P. H.
(2018).
Sediment accumulation and mixing in the Penobscot River and estuary, Maine. Science of the Total Environment.
635, 228-239.
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Sun, L., Chiu, M., Xu, C., Lin, P., Schwehr, K. A., Bacosa, H., ... Santschi, P. H.
(2018).
The effects of sunlight on the composition of exopolymeric substances and subsequent aggregate formation during oil spills. Marine Chemistry.
203, 49-54.
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Kamalanathan, M., Schwehr, K. A., Bretherton, L., Genzer, J., Hillhouse, J., Xu, C., ... Quigg, A.
(2018).
Diagnostic tool to ascertain marine phytoplankton exposure to chemically enhanced water accommodated fraction of oil using Fourier Transform Infrared spectroscopy. MARINE POLLUTION BULLETIN.
130, 170-178.
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Yeager, K. M., Schwehr, K. A., Louchouarn, P., Feagin, R. A., Schindler, K. J., & Santschi, P. H.
(2018).
Mercury inputs and redistribution in the Penobscot River and estuary, Maine. Science of the Total Environment.
622-623, 172-183.
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Lin, P., Xu, C., Xing, W., Sun, L., Kaplan, D. I., Fujitake, N., ... Santschi, P. H.
(2018).
Radionuclide uptake by colloidal and particulate humic acids obtained from 14 soils collected worldwide. Scientific Reports.
8(1), 4795.
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Santschi, P. H., Yeager, K. M., Schwehr, K. A., & Schindler, K. J.
(2017).
Estimates of recovery of the Penobscot River and estuarine system from mercury contamination in the 1960's. Science of the Total Environment.
596-597, 351-359.
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Santschi, P. H., Xu, C., Zhang, S., Schwehr, K. A., Grandbois, R., Kaplan, D. I., & Yeager, C. M.
(2017).
Iodine and plutonium association with natural organic matter: A review of recent advances. APPLIED GEOCHEMISTRY.
85, 121-127.
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Lin, P., Xu, C., Zhang, S., Fujitake, N., Kaplan, D. I., Yeager, C. M., ... Santschi, P. H.
(2017).
Plutonium Partitioning Behavior to Humic Acids from Widely Varying Soils Is Related to Carboxyl-Containing Organic Compounds. ENVIRONMENTAL SCIENCE & TECHNOLOGY.
51(20), 11742-11751.
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Yeager, C. M., Amachi, S., Grandbois, R., Kaplan, D. I., Xu, C., Schwehr, K. A., & Santschi, P. H.
(2017).
Microbial Transformation of Iodine: From Radioisotopes to Iodine Deficiency. Adv Appl Microbiol.
101, 83-136.
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Lin, P., Xu, C., Zhang, S., Sun, L., Schwehr, K. A., Bretherton, L., Quigg, A., & Santschi, P. H.
(2017).
Importance of coccolithophoreassociated organic biopolymers for fractionating particlereactive radionuclides ( 234 Th, 233 Pa, 210 Pb, 210 Po, and 7 Be) in the ocean. JOURNAL OF GEOPHYSICAL RESEARCH-BIOGEOSCIENCES.
122(8), 2033-2045.
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Sun, L., Xu, C., Zhang, S., Lin, P., Schwehr, K. A., Quigg, A., ... Santschi, P. H.
(2017).
Light-induced aggregation of microbial exopolymeric substances. Chemosphere.
181, 675-681.
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Santschi, P. H., Xu, C., Zhang, S., Schwehr, K. A., Lin, P., Yeager, C. M., & 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. J Environ Radioact.
171, 226-233.
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Xu, C., Zhang, S., Sugiyama, Y., Ohte, N., Ho, Y., Fujitake, N., ... Santschi, P. H.
(2016).
Role of natural organic matter on iodine and (239)(,240)Pu distribution and mobility in environmental samples from the northwestern Fukushima Prefecture, Japan. J Environ Radioact.
153, 156-166.
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Xu, C., Zhang, S., Kaplan, D. I., Ho, Y., Schwehr, K. A., Roberts, K. A., ... Santschi, P. H.
(2015).
Evidence for Hydroxamate Siderophores and Other N-Containing Organic Compounds Controlling (239,240)Pu Immobilization and Remobilization in a Wetland Sediment. ENVIRONMENTAL SCIENCE & TECHNOLOGY.
49(19), 11458-11467.
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Chuang, C., Santschi, P. H., Wen, L., Guo, L., Xu, C., Zhang, S., ... Schumann, D.
(2015).
Binding of Th, Pa, Pb, Po and Be radionuclides to marine colloidal macromolecular organic matter. Marine Chemistry.
173, 320-329.
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Xu, C., Kaplan, D. I., Zhang, S., Athon, M., Ho, Y., Li, H., ... Santschi, P. H.
(2015).
Radioiodine sorption/desorption and speciation transformation by subsurface sediments from the Hanford Site. J Environ Radioact.
139, 43-55.
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Schwehr, K. A., Otosaka, S., Merchel, S., Kaplan, D. I., Zhang, S., Xu, C., ... 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.
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Kaplan, D. I., Denham, M. E., Zhang, S., Yeager, C., Xu, C., Schwehr, K. A., ... Santschi, P. H.
(2014).
Radioiodine Biogeochemistry and Prevalence in Groundwater. CRITICAL REVIEWS IN ENVIRONMENTAL SCIENCE AND TECHNOLOGY.
44(20), 2287-2335.
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Zhang, S., Ho, Y., Creeley, D., Roberts, K. A., Xu, C., Li, H., ... Santschi, P. H.
(2014).
Temporal variation of iodine concentration and speciation (127I and 129I) in wetland groundwater from the Savannah River Site, USA. ENVIRONMENTAL SCIENCE & TECHNOLOGY.
48(19), 11218-11226.
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Emerson, H. P., Xu, C., Ho, Y., Zhang, S., Schwehr, K. A., Lilley, M., ... Powell, B. A.
(2014).
Geochemical controls of iodine uptake and transport in Savannah River Site subsurface sediments. APPLIED GEOCHEMISTRY.
45, 105-113.
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Li, H., Daniel, B., Creeley, D., Grandbois, R., Zhang, S., Xu, C., ... Yeager, C. M.
(2014).
Superoxide production by a manganese-oxidizing bacterium facilitates iodide oxidation. Appl Environ Microbiol.
80(9), 2693-2699.
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Xu, C., Athon, M., Ho, Y., Chang, H., Zhang, S., Kaplan, D. I., ... Santschi, P. H.
(2014).
Plutonium immobilization and remobilization by soil mineral and organic matter in the far-field of the Savannah River Site, U.S. ENVIRONMENTAL SCIENCE & TECHNOLOGY.
48(6), 3186-3195.
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Zhang, S., Xu, C., Creeley, D., Ho, Y., Li, H., Grandbois, R., ... Santschi, P. H.
(2013).
Response to comment on "Iodine-129 and iodine-127 speciation in groundwater at Hanford Site, U.S.: iodate incorporation into calcite". ENVIRONMENTAL SCIENCE & TECHNOLOGY.
47(22), 13205-13206.
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Zhang, S., Xu, C., Creeley, D., Ho, Y., Li, H., Grandbois, R., ... Santschi, P. H.
(2013).
Iodine-129 and iodine-127 speciation in groundwater at the Hanford site, US: iodate incorporation into calcite. ENVIRONMENTAL SCIENCE & TECHNOLOGY.
47(17), 9635-9642.
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Quigg, A., Chin, W., Chen, C., Zhang, S., Jiang, Y., Miao, A., ... Santschi, P. H.
(2013).
Direct and Indirect Toxic Effects of Engineered Nanoparticles on Algae: Role of Natural Organic Matter. ACS SUSTAINABLE CHEMISTRY & ENGINEERING.
1(7), 686-702.
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Xu, C., Chen, H., Sugiyama, Y., Zhang, S., Li, H., Ho, Y., ... Santschi, P. H.
(2013).
Novel molecular-level evidence of iodine binding to natural organic matter from Fourier transform ion cyclotron resonance mass spectrometry. Science of the Total Environment.
449, 244-252.
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Zhang, S., Jiang, Y., Chen, C., Creeley, D., Schwehr, K. A., Quigg, A., Chin, W., & Santschi, P. H.
(2013).
Ameliorating effects of extracellular polymeric substances excreted by Thalassiosira pseudonana on algal toxicity of CdSe quantum dots. Aquatic Toxicology.
126, 214-223.
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Xu, C., Zhong, J., Hatcher, P. G., Zhang, S., Li, H., Ho, Y., ... Santschi, P. H.
(2012).
Molecular environment of stable iodine and radioiodine (129I) in natural organic matter: Evidence inferred from NMR and binding experiments at environmentally relevant concentrations. GEOCHIMICA ET COSMOCHIMICA ACTA.
97, 166-182.
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Zhang, S., Jiang, Y., Chen, C., Spurgin, J., Schwehr, K. A., Quigg, A., Chin, W., & Santschi, P. H.
(2012).
Aggregation, dissolution, and stability of quantum dots in marine environments: importance of extracellular polymeric substances. ENVIRONMENTAL SCIENCE & TECHNOLOGY.
46(16), 8764-8772.
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Li, H., Yeager, C. M., Brinkmeyer, R., Zhang, S., Ho, Y., Xu, C., ... Santschi, P. H.
(2012).
Bacterial production of organic acids enhances H2O2-dependent iodide oxidation. ENVIRONMENTAL SCIENCE & TECHNOLOGY.
46(9), 4837-4844.
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Xu, C., Miller, E. J., Zhang, S., Li, H., Ho, Y., Schwehr, K. A., ... Santschi, P. H.
(2011).
Sequestration and remobilization of radioiodine (129I) by soil organic matter and possible consequences of the remedial action at Savannah River Site. ENVIRONMENTAL SCIENCE & TECHNOLOGY.
45(23), 9975-9983.
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Xu, C., Zhang, S., Ho, Y., Miller, E. J., Roberts, K. A., Li, H., ... Santschi, P. H.
(2011).
Is soil natural organic matter a sink or source for mobile radioiodine (129I) at the Savannah River Site?. GEOCHIMICA ET COSMOCHIMICA ACTA.
75(19), 5716-5735.
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Xu, C., Zhang, S., Chuang, C., Miller, E. J., Schwehr, K. A., & Santschi, P. H.
(2011).
Chemical composition and relative hydrophobicity of microbial exopolymeric substances (EPS) isolated by anion exchange chromatography and their actinide-binding affinities. Marine Chemistry.
126(1-4), 27-36.
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Otosaka, S., Schwehr, K. A., Kaplan, D. I., Roberts, K. A., Zhang, S., Xu, C., ... Santschi, P. H.
(2011).
Factors controlling mobility of 127I and 129I species in an acidic groundwater plume at the Savannah River Site. Science of the Total Environment.
409(19), 3857-3865.
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Zhang, S., Du, J., Xu, C., Schwehr, K. A., Ho, Y., Li, H., ... Santschi, P. H.
(2011).
Concentration-dependent mobility, retardation, and speciation of iodine in surface sediment from the Savannah River Site. ENVIRONMENTAL SCIENCE & TECHNOLOGY.
45(13), 5543-5549.
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Chen, C., Anaya, J. M., Zhang, S., Spurgin, J., Chuang, C., Xu, C., ... Chin, W.
(2011).
Effects of engineered nanoparticles on the assembly of exopolymeric substances from phytoplankton. PLoS One.
6(7), e21865-e21865.
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Li, H., Brinkmeyer, R., Jones, W. L., Zhang, S., Xu, C., Schwehr, K. A., ... Yeager, C. M.
(2011).
Iodide accumulation by aerobic bacteria isolated from subsurface sediments of a 129I-contaminated aquifer at the Savannah River site, South Carolina. Appl Environ Microbiol.
77(6), 2153-2160.
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Xu, C., Santschi, P. H., Hung, C., Zhang, S., Schwehr, K. A., Roberts, K. A., ... Wei, C.
(2011).
Controls of 234Th removal from the oligotrophic ocean by polyuronic acids and modification by microbial activity. Marine Chemistry.
123(1-4), 111-126.
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Kaplan, D. I., Roberts, K. A., Schwehr, K. A., Lilley, M. S., Brinkmeyer, R., Denham, M. E., ... Santschi, P. H.
(2011).
Evaluation of a radioiodine plume increasing in concentration at the Savannah River Site. ENVIRONMENTAL SCIENCE & TECHNOLOGY.
45(2), 489-495.
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Zhang, S., Schwehr, K. A., Ho, Y., Xu, C., Roberts, K. A., Kaplan, D. I., ... Santschi, P. H.
(2010).
A novel approach for the simultaneous determination of iodide, iodate and organo-iodide for 127I and 129I in environmental samples using gas chromatography-mass spectrometry. ENVIRONMENTAL SCIENCE & TECHNOLOGY.
44(23), 9042-9048.
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Hung, C., Xu, C., Santschi, P. H., Zhang, S., Schwehr, K. A., Quigg, A., ... Wei, C.
(2010).
Comparative evaluation of sediment trap and 234Th-derived POC fluxes from the upper oligotrophic waters of the Gulf of Mexico and the subtropical northwestern Pacific Ocean. Marine Chemistry.
121(1-4), 132-144.
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Xu, C., Santschi, P. H., Schwehr, K. A., & Hung, C.
(2009).
Optimized isolation procedure for obtaining strongly actinide binding exopolymeric substances (EPS) from two bacteria (Sagittula stellata and Pseudomonas fluorescens Biovar II). Bioresour Technol.
100(23), 6010-6021.
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Miao, A., Schwehr, K. A., Xu, C., Zhang, S., Luo, Z., Quigg, A., & Santschi, P. H.
(2009).
The algal toxicity of silver engineered nanoparticles and detoxification by exopolymeric substances. Environmental Pollution.
157(11), 3034-3041.
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Schwehr, K. A., Santschi, P. H., Kaplan, D. J., Yeager, C. M., & Brinkmeyer, R.
(2009).
Organo-iodine formation in soils and aquifer sediments at ambient concentrations. ENVIRONMENTAL SCIENCE & TECHNOLOGY.
43(19), 7258-7264.
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Schwehr, K. A., Santschi, P. H., Moran, J. E., & Elmore, D.
(2005).
Near-conservative behavior of 129I in the orange county aquifer system, California. APPLIED GEOCHEMISTRY.
20(8), 1461-1472.
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Schwehr, K. A., Santschi, P. H., & Elmore, D.
(2005).
The dissolved organic iodine species of the isotopic ratio of129I/127I: A novel tool for tracing terrestrial organic carbon in the estuarine surface waters of Galveston Bay, Texas. Limnology and Oceanography Methods.
3(8), 326-337.
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Santschi, P. H., & Schwehr, K. A.
(2004).
129I/(127)I as a new environmental tracer or geochronometer for biogeochemical or hydrodynamic processes in the hydrosphere and geosphere: the central role of organo-iodine. Science of the Total Environment.
321(1-3), 257-271.
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Schwehr, K. A., & Santschi, P. H.
(2003).
Sensitive determination of iodine species, including organo-iodine, for freshwater and seawater samples using high performance liquid chromatography and spectrophotometric detection. Analytica Chimica Acta.
482(1), 59-71.
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Kamalanathan, M., Schwehr, K. A., Labonté, J. M., Taylor, C., Bergen, C., Patterson, N., ... Quigg, A.
(2021).
The Interplay of Phototrophic and Heterotrophic Microbes Under Oil Exposure: A Microcosm Study. FRONTIERS IN MICROBIOLOGY.
12, 675328.
-
conference paper
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Kaplan, D., Xu, C., Lin, P., Schwehr, K., Fujitake, N., Yeager, C., & Santschi, P.
(2018).
Soil organic matter and plutonium interactions. ACS National Meeting Book of Abstracts.
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Jiang, Y., Zhang, S., Chen, C., Creeley, D., Schwehr, K. A., Chin, W., Santschi, P. H., & Quigg, A.
(2012).
Effects of extracellular polymeric substances of Thalassiosira pseudonana and nitrogen-depletion on the fate of Cd/Se quantum dots. ACS National Meeting Book of Abstracts.
-
Xu, C., Sugiyama, Y., Hatcher, P. G., Zhang, S., Li, H., Ho, Y., ... Santschi, P. H.
(2012).
Investigation of the radioiodine binding environment in terrestrial aquatic natural organic matter by FT-ICR-MS. ACS National Meeting Book of Abstracts.
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Kaplan, D. I., Brinkmeyer, R., Denham, M. E., Noonkester, J. V., Roberts, K. A., Schwehr, K. A., ... Santschi, P. H.
(2010).
Groundwater Iodine-129 speciation and its causes for release from a subsurface burial basin. GEOCHIMICA ET COSMOCHIMICA ACTA.
A495-A495.
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Zhang, S., Du, J., Xu, C., Schwehr, K. A., Ho, Y., Santschi, P. H., & Kaplan, D. I.
(2010).
Mobility of iodine (I-129 and I-127) species in sediment columns from the Savannah River Site. GEOCHIMICA ET COSMOCHIMICA ACTA.
A1211-A1211.
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Schwehr, K. A., Santschi, P. H., & Kaplan, D. I.
(2009).
Organo-iodine formation in aquifer sediments at ambient concentrations. GEOCHIMICA ET COSMOCHIMICA ACTA.
A1187-A1187.
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Schwehr, K. A., Santschi, P. H., Moran, J. E., & Elmore, D.
(2005).
Near-conservative behavior of (129)Iodine in the Orange County Aquifer System, California. GEOCHIMICA ET COSMOCHIMICA ACTA.
A721-A721.
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Kaplan, D., Xu, C., Lin, P., Schwehr, K., Fujitake, N., Yeager, C., & Santschi, P.
(2018).
Soil organic matter and plutonium interactions. ACS National Meeting Book of Abstracts.
Teaching
teaching activities
- FSCI491 Research Instructor
Background
education and training
- Ph.D. in Oceanography, Texas A&M University - (College Station, Texas, United States) 2004
- M.S. in Geosciences, University of Houston - (Houston, Texas, United States) 1998
- B.S. in Geophysical Engineering, Montana Tech of the University of Montana - (Butte, Montana, United States) 1982
Contact
first name
- Kathleen
has last name
- Schwehr
Other
- schwehrk@tamu.edu