Laodong Guo

School of Freshwater Sciences



Dr. Guo’s major research focus is on marine and freshwater biogeochemistry, with an emphasis on the role of natural organic matter and aquatic colloids/nanoparticles in governing the fate, transport and bioavailability of chemical species. He received his master degree in marine chemistry from Xiamen University, China, where he then worked for several years in the Department of Oceanography. After moving to Texas A&M University, College Station, where he obtained his Ph.D. degree in Chemical Oceanography in 1995, Dr. Guo worked as a postdoc and assistant research scientist in the Laboratory for Oceanographic and Environmental Research, Texas A&M University at Galveston, until 2000. He then moved to the University of Alaska-Fairbanks, and worked there for 5 years as scientist/research professor in the International Arctic Research Center. Dr. Guo joined the Department of Marine Science at the University of Southern Mississippi in 2005 as an associate professor and was granted tenure the following year and full professorship in 2011. He has been a professor in the School of Freshwater Sciences at the University of Wisconsin-Milwaukee since January 2012.

Dr. Guo has published over 140 peer-reviewed papers and book-chapters in the fields of earth and environmental sciences, with an H-index of 41 based on Google Scholar. He currently serves as an editorial board member of Scientific Reports, an open journal published by Nature Publishing Group, and the Journal of Riparian Ecology and Conservation, published by Versita Open.


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

Research Interests

  • Marine and freshwater biogeochemistry of carbon, nutrients and trace elements
  • Fate and transport of oil, dispersant and other chemical species
  • Aquatic colloids and nanoparticles
  • Applications of U-Th decay series and other radionuclides in aquatic environments
  • Biogeochemical processes at the land-ocean, river-lake, particle-water and biota-water interfaces
  • Biogeochemical consequences of climate and environmental changes
Recent and Selected Publications
  • DeVilbiss, S.E.. Zhou, Z., Klump. J.V. and Guo, L.  2016. Spatiotemporal variations in the abundance and composition of bulk and chromophoric dissolved organic matter in seasonally hypoxia-influenced Green Bay, Lake Michigan. Science of the Total Environment, 565, 742–757, doi: 10.1016/j.scitotenv.2016.05.015.
  • Zhou, Z., Guo, L. and Minor, E.C.   2016. Characterization of bulk and chromophoric dissolved organic matter in the Laurentian Great Lakes. J. Great Lakes Res. 42(4), 789–801. doi: 10.1016/j.jglr.2016.04.006.
  • Cai, Y., Shim, M.J., Guo, L. and Shiller, A.M. 2016. Floodplain influence on carbon speciation and fluxes from the lower Pearl River, Mississippi. Geochim. Cosmochim. Acta , 186, 189-206.doi:10.1016/j.gca.2016.05.007.
  • Zhou, Z., Stolpe, B., Guo, L., Shiller, A.M. 2016.  Colloidal size spectra, composition and estuarine mixing behavior of DOM in river and estuarine waters of the northern Gulf of Mexico. Geochim. Cosmochim. Acta, 181, 1-17.  doi: 10.1016/j.gca.2016.02.032.
  • Lin, P., Guo, L. 2016. Dynamic changes in the abundance and chemical speciation of dissolved and particulate phosphorus across the river-lake interface in southwest Lake Michigan. Limnology and Oceanography, 61, 771-789, doi: 10.1002/lno.10254.
  • Xu, H., Guo, L. and Jiang, H. 2016. Depth-dependent variations of sedimentary dissolved organic matter composition in a eutrophic lake: Implications for lake restoration. Chemosphere, 145, 551-559.doi:10.1016/j.chemosphere.2015.09.015.
  • Lin, P., Klump, J.V., and Guo, L. 2016. Dynamics of dissolved and particulate phosphorus influenced by seasonal hypoxia in Green Bay,Lake Michigan. Science of the Total Environment, 541, 1070-1082, DOI:10.1016/j.scitotenv.2015.09.118 .
  • Cai, Y., Guo, L., Wang, X and Aiken, G. 2015. Variations in the abundance and stable isotopic composition of DOC, POC and DIC in thelower Mississippi River during 2006-2008. JGR-Biogeosciences,120, 2273–2288, doi: 10.1002/2015JG003139.
  • Zhou, Z., Guo, L. and Osburn, C. 2015. Fluorescence and PARAFAC modeling in the analysis of petroleum and hydrocarbons. Chapter 137, in “Hydrocarbon and Lipid Microbiology Protocols”, Springer Protocols Handbooks, T. McGenity, K. Timmis, and B. Nogales (eds), DOI10.1007/8623_2015_137, Springer-Verlag Berlin Heidelberg.
  • Ni, J., Lin, P., Zhen, Y., Yao, X., and Guo, L. 2015. Distribution, source and chemical speciation of phosphorus in surface sediments of the central Pacific Ocean.  Deep-Sea Research I., 105: 74–82, doi:10.1016/j.dsr.2015.08.008.
  • Gao, L., Li, D.,  Ishizaka, J., Zhang, Y., Zong, H., and Guo, L. 2015. Nutrient dynamics across the river-sea interface in the Changjiang (Yangtze River) Estuary – East China Sea system. Limnology and Oceanography, 60(6), 2207–2221, doi: 10.1002/lno.10196.
  • Chuang, C.Y., P.H. Santschi, C. Xu, Y. Jiang, Y. Ho, A. Quigg, L. Guo, P. G. Hatcher, M. Ayranov, and D. Schumann. 2015. Molecular level characterization of diatom associated biopolymers that bind 234Th, 233Pa,210Pb, and 7Be in seawater: a case study with Phaeodactylum tricornutum.JGR-Biogeoscience, 120, 1858–1869, DOI: 10.1002/2015JG002970.
  • Zhou, Z. and  Guo, L. 2015.  A critical evaluation of an asymmetrical flow field-flow fractionation system for colloidal size characterization of natural dissolved organic matter. Journal of Chromatography A.  1399, 53-64, doi: 10.1016/j.chroma.2015.04.035.
  • Yang, W., Guo, L.,  Chuang, ,C.Y., Santschi, P.H., Ayranov, M., Schumann, D. 2015. Influence of organic matter on the adsorption of210Pb, 210Po and 7Be and fractionation on nanoparticles in seawater. Earth and Planetary Science Letters 423, 193-201, doi: 10.1016/j.epsl.2015.05.007.
  • Lin, P. and Guo, L. 2015. Spatial and vertical variability of dissolved carbohydrate species in the northern Gulf of Mexico following the Deepwater Horizon oil spill,  2010-2011. Marine Chemistry, 174, 13-25,doi: 10.1016/j.marchem.2015.04.001.
  • Chuang, ,C.Y., Santschi, P.H., Wen, L.S., Guo, L.D., Xu, C., Zhang, S., Jiang, Y., Ho, Y, Schwehr, K.A., Quigg, A., Hung, C.C., 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, doi: 10.1016/j.marchem.2014.10.014.
  • Lin, P., Chen, M., and Guo, L. 2015. Effect of natural organic matter on the adsorption and fractionation of Th(IV) and Pa(IV,V) on nanoparticles in seawater.  Marine Chemistry, 173, 291-301,  doi: 10.1016/j.marchem.2014.08.006.


Biogeochemistry, carbon cycle, colloids and nanparticles, stable isotopes, radionuclides, environmental change