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Laodong Guo

Laodong Guo

  • Professor, School of Freshwater Sciences

Website: /guo-lab/

Biography

Dr. Guo’s major research focus is on aquatic biogeochemistry, with an emphasis on the role of natural organic matter and nano-sized colloids in governing the fate, transport and bioavailability of chemical species, including trace metals, radionuclides, engineered nanoparticles, and legacy and emerging contaminants.  He received his Ph.D. degree in Chemical Oceanography in 1995 from Texas A&M University (), College Station.  After working as a postdoc and assistant research scientist at , Dr. Guo joined University of Alaska-Fairbanks () in 2000 as a research professor in the International Arctic Research Center () and then University of Southern Mississippi () in 2005 as a faculty member (tenured in 2006) in the Department of Marine Science.  Dr. Guo has been a professor in the School of Freshwater Sciences at the University of Wisconsin-Milwaukee since 2012.

Dr. Guo has authored/coauthored over 200 peer-reviewed publications in the fields of earth and environmental sciences, with an H-index of 62 based on or 51 based on Web of Science (Researcher ID: ). He currently serves as an editor of (Springer), an associate editor of Frontiers in Environmental Science - Biogeochemical Dynamics (), and an editorial board member of (Nature), (MDPI), and (MDPI).

Education

  • PhD, Chemical Oceanography, Texas A&M University, 1995

Research Interests

  • Biogeochemical cycling of carbon, nutrients, and trace elements
  • Role of natural organic matter and nano-sized colloids in regulating the fate, transport, and toxicity/bioavailability of trace metals, engineered nanoparticles, and legacy/emerging contaminants
  • Microplastics and nanoplastics in freshwater environments
  • Physicochemical processes at the particle-water, biota-water, river-lake, and land-ocean interfaces
  • Biogeochemical consequences of climate and environmental changes

Recent and Selected Publications (or see detailed publication list here)

  • Abbott, B.W., Carey, J., Ernakovich, J., Frederick, J.M., Guo, L., and Others. We must stop fossil fuel emissions to protect permafrost ecosystems (mini review article). Frontiers in Environmental Science – Biogeochemical Dynamics, 10, 889428. doi:
  • Lin, H., Matsui, K., Newton, R.J. and Guo, L. Disproportionate changes in composition and molecular size spectra of dissolved organic matter between influent and effluent from a major metropolitan wastewater treatment plant. , 2(1), 216–225.
  • Piyawardhana, P.N., Weerathunga, V.A., Chen, H.S., Guo, L., Ranatunga, K.P., and Hung, C.C. 2022. Occurrence of microplastics in commercial marine dried fish in Asian countries. , 423, 127093.
  • Liu, M.X., Han, X.K., Liu, C-Q, Guo, L., Ding, H. and Lang, Y.C. 2021. Differences in the spectroscopic characteristics of wetland dissolved organic matter binding with Fe3+, Cu2+, Cd2+, Cr3+ and Zn2+. , 800, 149476.
  • Lin, H., Xu, H., Cai, Y. Belzile, C. Macdonald, R.W. and Guo, L. 2021. Dynamic changes in size-fractionated dissolved organic matter composition from the seasonally ice-covered Yukon River as characterized using fluorescence EEM-PARAFAC, FT-IR and data fusion. , 66, 3085-3099.
  • Wang, C.Y., Yang, Y., Yang, B., Lin, H., Miller, T.R., Newton, R.J., and Guo, L. 2021. Causal relationship between alkaline phosphatase activities and phosphorus dynamics in a eutrophic coastal lagoon in Lake Michigan. , 787, 147681.
  • Yang, B., Lin, H., Bartlett, S.L., Houghton, E.M., Robertson, D.M. and Guo, L. 2021. Partitioning and transformation of organic and inorganic phosphorus among dissolved, colloidal and particulate phases in a hypereutrophic freshwater estuary. , 196, 117025.
  • O’Donnell, J.A., Douglas, T.A., Barker, A.J. and Guo, L. 2021. Changing Biogeochemical Cycles of Organic Carbon, Nitrogen, Phosphorus, and Trace Elements in Arctic Rivers. In “Arctic hydrology, permafrost and ecosystems” Chapter 11, 315-348, Springer.
  • O’Connor, J.A., Lu, K., Guo, L., Rosenheim, B.E., Liu, Z.F. 2020. Composition and lability of riverine dissolved organic matter: Insights from thermal slicing pyrolysis GC-MS , amino acid, and stable isotope analyses. , 149, 104100.
  • Cai, Y.H., You, C.-F., Wu, S.-F., Cai, W.-J. and Guo, L. Seasonal variations in strontium and carbon isotope systematics in the Lower Mississippi River: Implications for chemical weathering. , 553, 119810.
  • Lin, H and Guo, L. 2020. Variations in colloidal DOM composition with molecular weight within individual water samples as characterized by flow field-flow fractionation and EEM-PARAFAC analysis. , 54(3), 1657-1667.
  • Lei, X.T., Zhang, H., Chen, M. Guo, L.D., Zhang, X.G., Jiang, Z.H., Blake, R. and Chen, Z.G. 2020. The effectivity of sequential extraction of phosphorus in soil and sediment: insights from the oxygen isotope of phosphate. , 20, 1332–1343.
  • Li, D., Xie, L., Carvan, M. and Guo, L. 2019. Mitigative effects of natural and model dissolved organic matter on the toxicity of methylmercury in embryonic Zebrafish. , 252, 616-626.
  • , X.T., Chen, M., Guo, L., Zhang, X.G., Jiang, Z.H., Chen, Z.G. 2019. Diurnal variations in the content and oxygen isotope composition of phosphate pools in a subtropical agriculture soil. , 337, 863-870.
  • Xu, H., Lin, H. Jiang, H. and Guo, L. 2018. Dynamic molecular size transformation of aquatic colloidal organic matter as a function of pH and cations. , 144, 543-552.
  • Xu, H., Yan, M., Li, W., Jiang H. and Guo, L. 2018. Dissolved organic matter binding with Pb(II) as characterized by differential spectra and 2-D UV–FTIR heterospectral correlation analysis. , 144: 435-443.
  • Lin, P., Klump, J.V. and Guo, L. 2018. Variations in chemical speciation and reactivity of phosphorus between suspended-particles and surface-sediments in seasonal hypoxia-influenced Green Bay. , 44, 864-874.
  • Kteeba, S.M., El-Adawi , H.I., El-Rayis, O.A., El-Ghobashy, A.E., Sreevidya, V.S., Guo, L. and Svoboda, K.R. 2018. Exposure to ZnO nanoparticles alters neuronal and vascular development in zebrafish: Acute and transgenerational effects mitigated with dissolved organic matter. , 242: 433-448,
  • Xu, H., Xu, M., Li, Y., Liu, X., Guo, L. and Jiang, H. 2018. Characterization, origin and aggregation behavior of colloids in eutrophic shallow lake. , 142, 176–186.
  • Gao, L., Zhou, Z., Reyes, A. and Guo, L. 2018. Yields and characterization of dissolved organic matter from different-aged soils from northern Alaska. , 123(7), 2035-2052.
  • Xu, H., Guan, D., Lin, H. and Guo, L. 2018. Contrasting effects of photochemical and microbial degradation on Cu(II) binding with fluorescent DOM from different origins. , 239, 205-214.
  • Baalousha, M., Afshinnia, K, and Guo, L. 2018. Natural organic matter composition determines the molecular nature of nanomaterial NOM-corona. , 5, 868-881.
  • Xu, H, and Guo, L. Intriguing changes in molecular size and composition of dissolved organic matter induced by microbial degradation and self-assembly. , 135, 187-194.
  • Yang, W. and Guo L. 2018. Sources and burial fluxes of soot black carbon in sediments on the Mackenzie, Chukchi, and Bering Shelves. , 155, 1-10.
  • Xu, H., Houghton, E.M., Houghton, C.J., Guo, L. 2018. Variations in size and composition of colloidal organic matter in a negative freshwater estuary (Green Bay). , 615, 931–941.
  • Dou, F. Ping, C.L., Li, X., Jorgenson, M.T., Guo, L., Chen, K., Michaelson, G. 2017. Soil organic carbon reactivity along the eroding coastline of Northern Alaska. 182(6), 227-232.
  • Kteeba, S.M., El-Adawi, H.I., El-Rayis, O.A., El-Ghobashy, A.E., Schuld, J.L., Svoboda, K.R., Guo, L. Zinc oxide nanoparticle toxicity in embryonic zebrafish: Mitigation with different natural organic matter. , 230, 1125–1140.
  • Welti, N., Striebel, M., Ulseth, A.J., Cross, W. F., DeVilbiss, S.E., Glibert, P.M., Guo, L., Hirst, A.G., Hood, J., Kominoski, J. S., MacNeill, K.L., Mehring, A.S., Welter, J. R., and Hillebrand, H. 2017. Bridging food webs, ecosystem metabolism, and biogeochemistry using ecological stoichiometry theory. 8, 01298.
  • Wang, W.H., Chen, M., Guo, L., Wang, W.X. 2017. Size partitioning and mixing behavior of trace metals and dissolved organic matter in a South China estuary. , 603–604, 434–444.
  • Xu, H.C. and Guo, L. 2017. Molecular size-dependent abundance and chemical composition of dissolved organic matter in river, lake and sea waters. 117, 115-126.
  • DeVilbiss, S.E. and Guo, L. 2017. Excretion of organic matter and nutrients from invasive quagga mussels and potential impact on carbon dynamics in Lake Michigan. , 43(3), 79-89.
  • Duan, S.W., He, Y., Kaushal, S., Bianchi, T.S., Ward, N., Guo, L. 2017. Impact of wetland decline on decreasing dissolved organic carbon concentration along the Mississippi River continuum. , 3, doi:

More publications can be found here.