Publications

Colloid Transport in Subsurface Media

• Abadzic S.A. and Ryan J.N., 2001. Particle release and permeability reduction in a natural zeolite (clinoptilolite) porous medium. Environmental Science & Technology 35, 4502-4508.  Article from ACS
• Backhus D.A., Ryan J.N., Groher D., MacFarlane J.K., and Gschwend P.M., 1993. Sampling colloids and colloid-associated contaminants in ground water. Ground Water 31, 466-479.  Article (pdf)
• Bunn R.A., Magelky R.D., Ryan J.N., and Elimelech M., 2002. Mobilization of natural colloids from an iron oxide-coated sand aquifer: Effect of pH and ionic strength. Environmental Science & Technology 36, 314-322.  Article from ACS
• DeNovio N.M., Saiers J.E., and Ryan J.N., 2004.  Colloid movement in unsaturated porous media: Recent advances and future directions.  Vadose Zone Journal 3, 338-351.  Article (pdf)
• Elimelech M., Nagai M., Ko C.-H., and Ryan J.N., 2000. The relative insignificance of mineral grain zeta potential to colloid transport in geochemically heterogeneous porous media. Environmental Science & Technology 34, 2143-2148.  Article (pdf)
• Gao B., Saiers J.E., and Ryan J.N., 2004.  Influence of pH on the deposition and mobilization of clay colloids in unsaturated porous media.  Water Resources Research 40, doi:10.1029/2004WR003189.  Article (pdf)
• Gao B., Saiers J.E., and Ryan J.N., accepted. Pore-scale mechanisms of colloid deposition and mobilization during steady and transient flow through unsaturated granular media. Accepted to Water Resources Research, October 2005.
• Loveland J.P., Bhattacharjee S., Ryan J.N., and Elimelech M., 2003. Colloid transport in a geochemically heterogeneous porous medium: Aquifer tank experiment and modeling. Journal of Contaminant Hydrology 65, 161-182.  Article (pdf)
• Loveland J.P., Ryan J.N., Amy G.L., and Harvey R.W., 1996. The reversibility of virus attachment to mineral surfaces. Colloids and Surfaces A. Physicochemical and Engineering Aspects 107, 205-222.  Article (pdf)
• Ryan J.N., Illangasekare T.H., Litaor M.I., and Shannon R., 1998. Particle and plutonium mobilization in a macroporous soil during rainfall simulations. Environmental Science & Technology 32, 476-482.  Article from ACS
• Ryan J.N. and Elimelech M., 1996. Colloid mobilization and transport in groundwater. Colloids and Surfaces A. Physicochemical and Engineering Aspects 107, 1-56.  Article (pdf)
• Ryan J.N., Elimelech M., Baeseman J.L., and Magelky R.D., 2000. Silica-coated titania and zirconia colloids for subsurface transport field experiments. Environmental Science & Technology 34, 2000-2005.  Article from ACS
• Ryan J.N. and Gschwend P.M., 1994. Effect of solution chemistry on the detachment of clay colloids from an iron oxide-coated sand. Environmental Science & Technology 28, 1717-1726.  Article (pdf)
• Ryan J.N. and Gschwend P.M., 1994. Effect of ionic strength and flow rate on colloid detachment kinetics: Dependence on intersurface potential energy. Journal of Colloid and Interface Science 164, 21-34.  Article (pdf)
• Ryan J.N. and Gschwend P.M., 1992. Effect of iron diagenesis on the transport of clay colloids in an unconfined sand aquifer. Geochimica et Cosmochimica Acta 56, 1507-1522.  Article (pdf)
• Ryan J.N. and Gschwend P.M., 1991. Extraction of iron oxides from sediments using reductive dissolution by titanium(III). Clays and Clay Minerals 39, 509-518.
• Ryan J.N. and Gschwend P.M., 1990. Groundwater colloids in two Atlantic Coastal Plain aquifers: Field studies. Water Resources Research 26, 307-322.  Article (pdf).
• Saiers, J.E., and Ryan, J.N., accepted. Colloid deposition on non-ideal porous media: The influences of collector shape and roughness on the single-collector efficiency. Accepted to Geophysical Research Letters, September 2005.
• Sun N., Elimelech M., Sun N.-Z., and Ryan J.N., 2001. A two-dimensional model of colloid transport in physically and geochemically heterogeneous porous media. Journal of Contaminant Hydrology 49, 173-199.  Article (pdf).
• Sun N., Elimelech M., Sun N.-Z., and Ryan J.N., 2001. Sensitivity analysis and parameter identifiability in colloid transport in geochemically heterogeneous porous media. Water Resources Research 37, 209-222.  Article (pdf).

Microbe Transport in Groundwater

• Abudalo R.A., Bogatsu Y.G., Ryan J.N., Harvey R.W., Metge D.W., and Elimelech M., 2005. The effect of ferric oxyhydroxide grain coatings on the transport of bacteriophage PRD1 and Cryptosporidium parvum oocysts in saturated porous media. Environmental Science & Technology 39, 6412-6419.  Article from ACS.
• Bhattacharjee S., Ryan J.N., and Elimelech M., 2002. Virus transport in physically and geochemically heterogeneous subsurface porous media. Journal of Contaminant Hydrology 57, 161-187.  Article (pdf).
• Harvey R.W. and Ryan J.N., 2004. PRD1 bacteriophage in groundwater viral transport, inactivation, and attachment studies.  FEMS Microbiology Ecology 49, 3-16.  Article (pdf).
• Pieper A.P., Ryan J.N., Amy G.L., Illangasekare T.H., Harvey R.W., and Metge D.W., 1997. Transport of bacteriophage PRD1 through an unconfined sand aquifer: Effect of sewage-derived organic matter. Environmental Science & Technology 31, 1163-1170.  Article from ACS.
• Renken R.A., Cunningham K.J., Zygnerski M.R., Wacker M.A., Shapiro A.M., Harvey R.W., Metge D.W., Osborn C.L., and Ryan J.N., 2005. Assessing the vulnerability of a municipal well field to contamination in a karst aquifer. Environmental & Engineering Geoscience 11, 319-331.  Article (pdf).
• Ryan J.N., Elimelech M., Ard R.A., Harvey R.W., and Johnson P.R., 1999. Bacteriophage PRD1 and silica colloid transport and recovery in an iron oxide-coated sand aquifer. Environmental Science & Technology 33, 63-73.
• Ryan J.N., Harvey R.W., Metge D., Elimelech M., Navigato T.N., and Pieper A.P., 2002. Field and laboratory investigations of inactivation of viruses (PRD1 and MS2) attached to iron oxide-coated quartz sand. Environmental Science & Technology 36, 2403-2413.  Article from ACS.
• Tufenkji N., Miller G.F., Ryan J.N., Harvey R.W., and Elimelech M., 2004.  Transport of Cryptosporidium oocysts in porous media: Role of straining and physicochemical filtration. Environmental Science & Technology 38, 5932-5938.  Article (pdf).
• Tufenkji N., Ryan J.N., and Elimelech M., 2002. The promise of bank filtration. Environmental Science & Technology 36, A422-A428.  Article (pdf).

Interactions of Mercury with Natural Organic Matter

• Aiken G.R., Haitzer M., Ryan J.N., and Nagy K., 2003.  Interactions between dissolved organic matter and mercury in the Florida Everglades.  Journal de Physique IV 107, 29-32.  Article (pdf).
• Haitzer M., Aiken G.R., and Ryan J.N.,  2003. Binding of mercury(II) to aquatic humic substances: Influence of pH and source of humic substances.  Environmental Science & Technology 37, 2436-2441.  Article from ACS.
• Drexel R.T., Haitzer M., Ryan J.N., Aiken G.R., and Nagy K.L., 2002. Mercury(II) binding to two Florida Everglades peats: Evidence for strong binding and competition with dissolved organic matter released from the peat. Environmental Science & Technology 36, 4058-4064.  Article from ACS.
• Haitzer M., Aiken G.R., and Ryan J.N., 2002. Binding of mercury(II) to dissolved organic matter: The role of mercury-to-DOM concentration ratio. Environmental Science & Technology 36, 3564-3570.  Article from ACS.
• Ravichandran M., Aiken G.R., Reddy M.M., and Ryan J.N., 1998. Enhanced dissolution of cinnabar (mercuric sulfide) by aquatic humic substances. Environmental Science & Technology 32, 3305-3311.  Article (pdf).
• Ravichandran M., Aiken G.R., Ryan J.N. and Reddy M.M., 1999. Inhibition of precipitation and aggregation of metacinnabar (mercuric sulfide) by dissolved organic matter isolated from the Florida Everglades. Environmental Science & Technology 33, 1418-1423. Article (pdf). 
• Waples J.S., Nagy K.L., Aiken G.R., and Ryan J.N., 2005.  Dissolution of cinnabar (HgS) in the presence of natural organic matter.  Geochimica et Cosmochimica Acta 69, 1575-1588.  Article (pdf).

Other Topics

• Edwards M., Benjamin M.M., and Ryan J.N., 1996. Role of organic matter acidity in sorption of natural organic matter (NOM) to oxide surfaces. Colloids and Surfaces A. Physicochemical and Engineering Aspects 107, 297-308.  Article (pdf).
• Keefe S.H., Barber L.B., Runkel R.L., and Ryan J.N., 2004.  Fate of volatile organic compounds in a constructed wastewater treatment wetland.  Environmental Science & Technology 38, 2209-2216.  Article from ACS.
• Keefe S.H., Barber L.B., Runkel R.L., Ryan J.N., McKnight D.M., and Wass R., 2004. Conservative and reactive solute transport in constructed wetlands.   Water Resources Research 40, doi:10.1029/2003WR002130.  Article (pdf).
• Maest A.S., Stallard R.F., Crerar D.A., and Ryan J.N., 1990. Trace metal and nutrient behavior in a polluted estuary with multiple freshwater sources. Chemical Geology 81, 133-149.
• Siddiqui M., Amy G., Ryan J., and Oden W., 2000. Membranes for the control of natural organic matter from surface waters. Water Research 34, 3355-3370.  Article (pdf).
• Sueker J.K., Clow D.W., Ryan J.N., and Jarrett R.D., 2001. Effect of basin physical characteristics on solute fluxes in nine alpine/subalpine basins, Colorado, USA. Hydrologic Processes 15, 2759-2769.  Article (pdf).
• Sueker J.K., Ryan J.N., Kendall C., and Jarrett R.D., 2000. Determination of hydrologic pathways during snowmelt for alpine/subalpine basins, Rocky Mountain National Park, Colorado. Water Resources Research 36, 63-75.  Article (pdf).