Please email prof. Johnson for the most recent pdfs.

Ron C., William P. Johnson, 2020, Complementary Colloid and Collector Nanoscale Heterogeneity Explains Microparticle Retention Under Unfavorable Conditions, Environ. Sci. Nano, DOI:

Johnson William P., Pazmino E., Frederick L., Ron C., Chica A., 2020, Contaminant removal and precious metal recovery by lateral channel filtration in mining impacted alluvial floodplains, Frontiers in Water, 2:586698,

Wright Jacob, Shu Yang, William P. Johnson, Frank J. Black, James McVey, Austin Epler, Abigail F. Scott, Madelene P. Trentman, Alexandria R. Martin, Gaurav Pandey, Andrew M. Piskadlo, 2020, Temporal Correspondence of Selenium and Mercury Among Brine Shrimp and Water in Great Salt Lake, Utah, USA, Sci. Tot. Environ., 749, 141273,

Johnson W.P., 2020, Quantitative Linking of Nanoscale Interactions to Continuum-Scale Nanoparticle and Microplastic Transport in Environmental Granular Media, Environ. Sci. Technol.

Johnson William P., Rasmuson Anna, Brock Erickson, Kurt VanNess, Cesar Ron, Diogo Bolster, Brett Peters, 2020, Anionic nanoparticle and microplastic non-exponential distributions from source scale with grain size in environmental granular media, Water Research, 116012,

Ma H., Bolster C., Johnson, W.P., Li K., Pazmino E., Camacho K.M., Anselmo A.C., Mitragotri S., 2020, Coupled influences of particle shape, surface property and flow hydrodynamics on rod-shaped colloid transport in porous media, J. Colloid & Interface Science, Volume 577, 1 October 2020, Pages 471-480.

Rasmuson Anna , Brock Erickson, Mark Borchardt, Maureen Muldoon, William P. Johnson, 2019, Pathogen Prevalence in Fractured versus Granular Aquifers and the Role of Forward Flow Stagnation Zones on Pore Scale Delivery to Surfaces, Environ. Sci. & Technol., 54, 1, 137-145.

Yang Shu, William P. Johnson, Frank J. Black, Ryan Rowland, Christine Rumsey, Andrew Piskadlo, 2019, Response of density stratification, aquatic chemistry, and methylmercury to engineered and hydrologic forcings in an endorheic lake (Great Salt Lake, U.S.A.), Limnol. Oceanogr., 9999, 2019, 1-12.

Ron Cesar A., Mei Dong, Karen L. Wooley, William P. Johnson, 2019, Theory-Guided Targeted Delivery of Nano- and Micro-Particles in Advective Environmental Porous Media, Environ. Sci. Techol. Letters. 6, 10, 617-623, 10.1021/acs.estlett.9b00474.

VanNess Kurt, Anna Rasmuson, Cesar A. Ron, William P. Johnson, 2019, A Unified Theory for Colloid Transport: Predicting Attachment and Mobilization under Favorable and Unfavorable Conditions, Langmuir, 35 (27), 9061-9070, 10.1021/acs.langmuir.9b00911.

Ron Cesar, Kurt VanNess, Anna Rasmuson, William P. Johnson, 2019, How Nanoscale Surface Heterogeneity Impacts Transport of Nano- to Micro-Particles on Surfaces under Unfavorable Attachment Conditions, Environmental Science: Nano, 6, 1921 - 1931, 10.1039/C9EN00306A.

Frederick Logan, William P. Johnson, Thure Cerling, Diego Fernandez, James VanDerslice, 2019, Source Identification of Particulate Metals/Metalloids Deposited in the San Juan River Delta of Lake Powell, USA, 230, 128, Water, Air and Soil Pollution,

Rasmuson Anna, Kurt VanNess, Cesar A. Ron, William P. Johnson, 2019, Hydrodynamic versus surface interaction impacts of roughness in closing the gap between favorable and unfavorable colloid transport conditions, Environ. Sci. Technol., 53 (5) 2450-2459, 10.1021/acs.est.8b06162

William Johnson, Huilian Ma, Anna Rasmuson, Kurt VanNess, Ke Li, Cesar Ron, Brock Erickson, 2018, Colloid Transport in Environmental Granular Porous Media: A Conceptual Description. Wiley Encyclopedia of Water: Science, Technology & Society.

William Johnson, Wayne Wurtsbaugh, Gary D. Belovsky, Bonnie K. Baxter, Frank Black, Cory Angeroth, Paul Jewell, Shu Yang, 2018, Geochemistry of Great Salt Lake, Wiley Encyclopedia of Water: Science, Technology & Society.

Johnson W.P, A. Rasmuson, M. Hilpert, and E. Pazmino, 2018, Why variant colloid transport behaviors emerge among identical individuals in porous media when colloid-surface repulsion exists. Environ. Sci. Technol., 52 (13), pp 7230-7239, DOI: 10.1021/acs.est.8b00811.

Frederick L., A. Brunelle, M. Morrison, P. Crespo, W.P. Johnson, 2017, Holocene Reconstruction of the Paleoclimate of the Ecuadorian Andean Páramo and assessment of the mid-Holocene warm/dry event in Tres Lagunas, Ecuador, in revision, Holocene.

Hilpert M.A. and W.P. Johnson, 2017, A binomial modeling approach for upscaling colloid transport under unfavorable attachment conditions: Emergent prediction of non-monotonic retention profiles, Water Resources Research, 54(1),

Hilpert M., A. Rasmuson, W.P. Johnson, 2017, A Binomial Modeling Approach for Upscaling Colloid Transport under Unfavorable Conditions: Organic Prediction of Extended Tailing, Water Resources Research, 53 (7), 5626-5644. 10.1002/2016WR020123.

Valdes C., F.J. Black, B. Stringham, J.N. Collins, J.R. Goodman, H.J. Saxton, C.R. Mansfield, J.N. Schmidt, and W.P. Johnson, 2017, Total Mercury and Methylmercury Response in Water Sediment, and Biota to Destratification of the Great Salt Lake, Utah, USA,

Rasmuson A., E. Pazmino, Assemi S., W.P. Johnson, 2017, The Contribution of Nanoscale Roughness to Heterogeneity: Closing the Gap between Unfavorable and Favorable Colloid Attachment Conditions, Environmental Science & Technology, 51 (4), pp 2151–2160, DOI 10.1021/acs.est.6b05911.

Hunt Randall J. and W.P. Johnson, 2016, Pathogen Transport in Groundwater Systems-Contrasts with Traditional Hydrogeological Approaches.  Hydrogeology Journal 46(40), 551-560, DOI 10.1007/s10040-016-1502-z.

Frederick, L., J. VanDerslice, M. Taddie, K. Malecki, J. Gregg, N. Faust, P Johnson, 2016, Determination of Regional and National Mechanisms for Arsenic MCL Exceedance across the United States using CART, Water Research, 91, 295-304.

Tasci T. O., Johnson W.P., Fernandez D.P., Manangon E., Gale* B.K., 2015, Particle Based Modeling of Electrical Field Flow Fractionation Systems, Chromatography, 2, 594-610; doi:10.3390/chromatography2040594.

Trauscht J., E. Pazmino, and W.P. Johnson, 2015, Prediction of Nanoparticle and Colloid Attachment on Unfavorable Mineral Surfaces Using Representative Discrete Heterogeneity, Langmuir, 31 (34), 9366–9378, DOI: 10.1021/acs.langmuir.5b02369.

Molnar Ian L., William P. Johnson, Jason I. Gerhard, and Denis M. O’Carroll, 2015, Predicting colloid transport through porous media: A critical review, Water Resources Research, 50th anniversary special issue DOI: 10.1002/2015WR017318.

Johnson W.P., L.E. Frederick, M.R. Millington, D. Vala, B.K. Reese, D.R. Freedman, C.J. Stenten, J.S. Trauscht, C.E. Tingey, D.K. Solomon, D.P. Fernandez, G.J. Bowen, 2015, Potential impacts to perennial springs from tar sand mining, processing, and disposal on the Tavaputs Plateau, Utah, USA, Science of the Total Environment, 532, 20-30, DOI: 10.1016/j.scitotenv.2015.05.127.

Johnson W.P., Swanson Neil P., Brooks Black, Abigail Rudd, Greg Carling, Diego P. Fernandez, John Luft, Jim Van Leeuwen, Mark Marvin-DiPasquale, 2015, Total- and methyl-mercury concentrations and methylation rates across the freshwater to hypersaline continuum of the Great Salt Lake, Utah, Science of the Total Environment, 511, 489-500, DOI: 10.1016/j.scitotenv.2014.12.092/.

Tasci T.O., P. Johnson, D.P. Fernandez, E. Manangon, B.K. Gale, 2014, Circuit Modification of Electrical Field Flow Fractionation Systems for High Resolution Separations of Nanoparticles, J. Chromatography A, 1365, 164-172, DOI: 10.1016/j.chroma.2014.08.097.

Petersen, K. E., Manangon, E., Hood, J. L., Wickline, S. A., Fernandez, D. P., Johnson, W. P., & Gale, B. K. , 2014, A review of exosome separation techniques and characterization of B16-F10 mouse melanoma exosomes with AF4-UV-MALS-DLS-TEM. Analytical and Bioanalytical Chemistry. (IR #18879) DOI: 10.1007/s00216-014-8040-0

Pazmino E., Jacob Trauscht, and Johnson W.P., 2014, Release of Colloids from Primary Minimum Contact Under Unfavorable Conditions by Perturbations in Ionic Strength and Flow Rate, Environ. Sci. Technol., 48(16), 9227–9235, DOI:

Pazmino E.,Jacob Trauscht, Brittany Dame, and Johnson W.P., 2014, "Power-law size-distributed heterogeneity explains colloid retention on soda-lime glass in the presence of energy barriers,” Langmuir, 30(19), 5412�5421,

Tasci T. O.,W. P. Johnson, E. Manangon, D. P. Fernandez, B. K. Gale*,2013 "Biased Cyclical Electrical Field Flow Fractionation for Separation of Sub 50 nm Particles, Analytical Chemistry, 85, 11225-11232”.

W. P. Johnson, Mallory Millington, Logan Frederick, Kip Solomon, Diego Fernandez, Jacob Trauscht, 2013 "Hydrochemical Data from Perennial Springs in the PR Spring Area of the Southern Uinta Basin,”, PDF.

Tasci T. O., E. Manangon, D. P. Fernandez, W. P. Johnson, B. K. Gale, "Utilization of High Duty Cycle Voltage Waveforms for  High Resolution Electrical Field Flow Fractionation”, (in preparation).

*Johnson W.P, & Markus Hilpert, 2013, Upscaling Colloid Transport & Retention under Unfavorable Conditions, in revision Water Resources Research. PDF

Ma H., Hradisky M., & *Johnson W.P., 2013, Extending Applicability of Correlation Equations to Predict Colloidal Retention in Porous Media at Low Fluid Velocity, Environ. Sci. Technol., 47, 2272−2278. PDF, Supporting Information

Carling G.T., Diaz X, Ponce M., Perez L., Nasimba L, Pazmino E, Rudd A, Fernandez DP, Merugu S, Gale BK, & *Johnson W.P., 2013, Trace element concentrations & loads in three southern Ecuador rivers impacted by artisanal gold mining, Water, Air, & Soil Pollution, Volume 224(2). PDF

Tasci T.O, Manangon E., Fernandez D.P., Johnson W.P., Gale B.K., 2013, Separation of Magnetic Nanoparticles by Cyclical Electrical Field Flow Fractionation,  IEEE Transactions on Magnetics, v 49, n 1, p 331-335, DOI: 10.1109/TMAG.2012.2223753. PDF

Carling G.T, Richards D.C., Hoven H.M., Miller T., Fernandez D.P., Rudd A.,  Pazmino E., *Johnson W.P., 2012, Relationships of surface water, pore water, & sediment chemistry in wetlands adjacent to Great Salt Lake, Utah, & potential impacts on plant community health, Science of the Total Environment, 443, 798-811. PDF

Dimkpa C. O., McLean J.E., Britt D.W., Johnson W.P., Arey B., Lea A.S, Anderson A.J., 2012, Nanospecific Inhibition of Pyoverdine Siderophore Production in Pseudomonas chlororaphis O6 by CuO Nanoparticles, Chemical Research in Toxicology, 25(5), 1066-1074. PDF

Tasci T. O., Johnson W.P., Gale B.K., 2012. “Cyclical Magnetic Field Flow Fractionation”. J. Appl. Phys: Proceedings of the 56th annual conference on magnetism & magnetic materials, vol. 111, p. 07D128.PDF

Dimkpa  CO, McLean JE, Latta DE, Manangón E, Britt DW, Johnson WP, Boyanov MI, Anderson AJ, 2012, CuO & ZnO nanoparticles: phytotoxicity, metal speciation & induction of oxidative stress in sand-grown wheat, J. Nanopart. Res., DOI: 10.1007/s11051-012-1125-9. PDF

Carling G.T., Fernandez D.P., & Johnson W.P., 2012, Dust-mediated loading of trace & major elements to Wasatch Mountain snowpack, Sci. Tot. Env., 432, 65-77, doi:10.1016/j.scitotenv.2012.05.077. PDF

Ma H., Pazmino E.F, Johnson W.P., 2011, Surface Heterogeneity on Hemispheres-in-Cell Model Yields All Experimentally-Observed Non-Straining Colloid Retention Mechanisms in Porous Media in the Presence of Energy Barriers, Langmuir, 27 (24), 14982–14994, PDF, Supporting Information

Pazmino E.F., Ma H., Johnson W.P., 2011, Applicability of colloid filtration theory in size-distributed, reduced porosity, granular media in the absence of energy barriers, Environ. Sci. Technol., 45, 10401-10407, doi:10.1021/es202203m. PDF

Ma H., Pazmino E.F., Johnson W.P., 2011, Gravitational Settling Effects on Unit Cell Predictions of Colloidal Retention in Porous Media in the Absence of Energy Barriers, Environ. Sci. Technol., 45(19), 8306-8312. PDF Supporting Information

Johnson W.P., Ma H., Pazmino E., 2011, Straining Credibility:  A general comment regarding common arguments used to infer straining as the mechanism of colloid retention in porous media, Environ. Sci. Technol., 45(9):3831-2. PDF

David C. Deubner, Philip Sabey, Wenjie Huang, Diego Fernandez, Abigail Rudd, David C Deubner, Philip Sabey, Wenjie Huang, Diego Fernandez, Abigail Rudd, W. P. Johnson, Jason Storrs, Rod Larson, 2011, Solubility & Chemistry of Materials Encountered by Beryllium Mine & Ore Extraction Workers: Relation to Risk 53(10), 1187. PDF

Isunju J.B., Schwartz K., Schouten M.A., Johnson W.P., van Dijk M.P., 2011, Socio-economic aspects of improved sanitation in slums: a review, Public Health, 125(6), 368-76. DOI: 10.1016/j.puhe.2011.03.008. PDF

Carling G.T., Fernandez D.P., Huang W., Rudd A., Pazmino E., *Johnson W.P., 2011, Trace element particulate pulse & diel variations in perimeter freshwater wetlands of Great Salt Lake, Utah, Chemical Geology, doi:10.1016/j.chemgeo.2011.01.001. PDF

Dimkpa CO, Calder A, Gajjar P, Merugu S, Huang W, Britt DW, McLean JE, Johnson W.P., Anderson AJ., 2011, Interaction of silver nanoparticles with an environmentally beneficial bacterium, Pseudomonas chlororaphis, J Hazard Mater., 188(1-3):428-35. PDF

Huang W., D. Fernandez, A. Rudd, W. P. Johnson, D. Deubner, P. Sabey, J. Storrs, R. Larsen, 2010, Dissolution & nanoparticle generation behavior of Be-associated materials in synthetic lung fluid using inductively coupled plasma mass spectroscopy & flow field-flow fractionation , J. of Chromatography A,, PDF, Supporting Information

Prof. William Johnson | Frederick Albert Sutton Bldg | Rm 441 | 115 S. 1460 E. | Salt Lake City, UT | 84112
Office: (801) 581-5033 | Email: