Skip to Main Content U.S. Department of Energy
Marine Sciences Division

Gary Gill

Gary Gill

Marine Sciences Laboratory
Pacific Northwest National Laboratory
1529 West Sequim Bay Road
Sequim, Washington 98382

Biography

Dr. Gill joined the Pacific Northwest National Laboratory in 2005 as the manager for the Marine and Environmental Chemistry Group at the Marine Sciences Laboratory in Sequim, Washington. Dr. Gill is recognized for his expertise in the biogeochemistry of trace elements in aquatic systems. Prior to coming to MSL, Dr. Gill was a full professor in the Department of Marine Sciences at Texas A&M University at Galveston where he mentored numerous graduate students. Dr. Gill also held a joint appointment in the Department of Oceanography at the main campus of Texas A&M University in College Station, Texas.

Research Interests

  • The biogeochemistry of trace elements in natural waters, with particular experience and interest in environmental and analytical studies concerning mercury.
  • Trace element analysis using ultra-clean laboratory and environmental sampling techniques.
  • Chemical and biological interactions involving trace elements in aquatic environments.
  • The chemical speciation of trace elements in natural waters.
  • Understanding the role that chemical speciation plays in the interaction of trace elements with biota and particulate surfaces and the influence of this interaction on the geochemical cycling of trace elements in natural waters.
  • Geochemical processes that control the temporal and spatial distribution of trace elements in estuaries, surface and deep waters of the ocean and other aquatic systems. These processes include the air/sea exchange, sediment-water exchange, scavenging of trace elements from the surface ocean by particles.

Education and Credentials

  • Post-graduate, Institute of Marine Sciences, University of California, Santa Cruz, CA. 1986-1988
  • Ph.D., Chemical Oceanography, University of Connecticut, 1986
  • M.S., Chemical Oceanography, University of Connecticut, 1980
  • B.S., Chemistry and Chemical Oceanography, University of Washington, 1976

Affiliations and Professional Service

Awards and Recognitions

  • Invited Participant and Speaker, Gulf of Mexico Mercury Workshop, sponsored by the Gulf of Mexico Alliance and the Florida Department of Environmental Protection December 2-4, 2008.
  • Invited Member, Mercury-Impaired Waters Advisory Group, see: http://www.tceq.state.tx.us/implementation/water/planning/mercurygroup/index.html, Texas Commission on Environmental Quality, June 13, 2008.
  • Invited Participant and Speaker, Cross Disciplinary Mercury Conference, Blackberry Farm – Walland, Tennessee, April 13-15, 2008
  • Member, Governance Committee, Puget Sound Coordinated Monitoring Program. The Governance Committee was organized by the Washington Department of Ecology to create an organizational structure and decision making process for the development of a Puget Sound Coordinated Monitoring Program (October 2007)
  • Member, Technical Advisory Committee, Puget Sound Coordinated Monitoring Program. The Technical advisory committee was organized by the Washington Department of Ecology to be a scientific advisory resource to the Department of Ecology in the development of a Puget Sound Coordinated Monitoring Program (October 2007).
  • Special Session Co-chair, Mercury-Dissolved Organic Matter Interactions, 8th International Conference on Mercury as a Global Pollutant, Madison, WI, August, 6-11th, 2006.
  • Participant, National Science and Technology Council (NSTC) Joint Subcommittee on Ocean Science and Technology (JSOST), April 18-20, 2006 in Denver, CO
  • Texas A&M University Association of Former Students Distinguished Faculty Teaching Award September 2005.
  • Invited Speaker, The Mercury Forum -- Assessing methylmercury in the Northern Gulf Environment, Mobile Alabama, May 20-21, 2002. Sponsored by the Mississippi-Alabama Sea Grant Consortium and the Mobile Bay National Estuary Program.
  • Member of the Science Advisory Panel for the Hudson River Foundation in association with the Contamination Assessment and Reduction Program (CARP) of the New York/New Jersey Harbor Estuary Program (HEP), January 7, 2002.
  • Invited Participant, NSF Chemical Oceanography panel, May 1998
  • Fellow, Texas Academy of Sciences, March 1997

PNNL Publications

2016

  • Wood JR, GA Gill, LJ Kuo, JE Strivens, and KY Choe. 2016. "Comparison of Analytical Methods for the Determination of Uranium in Seawater Using Inductively Coupled Plasma Mass Spectrometry." Industrial and Engineering Chemistry Research 55(15):4344-4350.  doi:10.1021/acs.iecr.5b03680
  • Abney CW, S Das, RT Mayes, LJ Kuo, JR Wood, GA Gill, M Piechowicz, Z Lin, W Lin, and S Dai. 2016. "A report on emergent uranyl binding phenomena by an amidoxime phosphonic acid co-polymer." Physical Chemistry Chemical Physics. PCCP 18(34):23462-23468.  doi:10.1039/c6cp04772f
  • Brown S, Y Yue, LJ Kuo, N Mehio, M Li, GA Gill, C Tsouris, RT Mayes, T Saito, and S Dai. 2016. "Uranium Adsorbent Fibers Prepared by Atom-Transfer Radical Polymerization (ATRP) from Poly(vinyl chloride)-co-chlorinated Poly(vinyl chloride) (PVC-co-CPVC) Fiber." Industrial and Engineering Chemistry Research 55(15):4139-4148.  doi:10.1021/acs.iecr.5b03355
  • Chouyyok W, CL Warner, KE Mackie, MG Warner, GA Gill, and RS Addleman. 2016. "Nanostructured Metal Oxide Sorbents for the Collection and Recovery of Uranium from Seawater." Industrial and Engineering Chemistry Research 55(15):4195-4207.  doi:10.1021/acs.iecr.5b03650
  • Chouyyok W, JW Pittman, MG Warner, KM Nell, DC Clubb, GA Gill, and RS Addleman. 2016. "Surface Functionalized Nanostructured Ceramic Sorbents for the Effective Collection and Recovery of Uranium from Seawater." Dalton Transactions 45(28):11312-11325.  doi:10.1039/c6dt01318j
  • Das S, C Tsouris, C Zhang, J Kim, S Brown, Y Oyola, C Janke, RT Mayes, LJ Kuo, JR Wood, GA Gill, and S Dai. 2016. "Enhancing Uranium Uptake by Amidoxime Adsorbent in Seawater: An investigation for optimum alkaline conditioning parameters." Industrial and Engineering Chemistry Research 55(15):4294-4302.  doi:10.1021/acs.iecr.5b02735
  • Das S, SS Brown, RT Mayes, CJ Janke, C Tsouris, LJ Kuo, GA Gill, and S Dai. 2016. "Novel Poly(imide dioxime) Sorbents: Development and testing for enhanced extraction of uranium from natural seawater." Chemical Engineering Journal 298:125-135.  doi:10.1016/j.cej.2016.04.013
  • Das S, WP Liao, M Flicker Byers, C Tsouris, CJ Janke, RT Mayes, E Schneider, LJ Kuo, JR Wood, GA Gill, and S Dai. 2016. "Alternative Alkaline Conditioning of Amidoxime Based Adsorbent for Uranium Extraction from Seawater." Industrial and Engineering Chemistry Research 55(15):4303-4312.  doi:10.1021/acs.iecr.5b03210
  • Das S, Y Oyola, RT Mayes, CJ Janke, LJ Kuo, GA Gill, JR Wood, and S Dai. 2016. "Extracting Uranium from Seawater: Promising AF Series Adsorbents." Industrial and Engineering Chemistry Research 55(15):4110-4117.  doi:10.1021/acs.iecr.5b03136
  • Das S, Y Oyola, RT Mayes, CJ Janke, LJ Kuo, GA Gill, JR Wood, and S Dai. 2016. "Extracting Uranium from Seawater: Promising AI Series Adsorbents." Industrial and Engineering Chemistry Research 55(15):4103-4109.  doi:10.1021/acs.iecr.5b03135
  • Gill GA, LJ Kuo, CJ Janke, J Park, RT Jeters, GT Bonheyo, HB Pan, C Wai, T Khangaonkar, L Bianucci, JR Wood, MG Warner, SM Peterson, DG Abrecht, R Mayes, C Tsouris, Y Oyola, JE Strivens, NJ Schlafer, RS Addleman, W Chouyyok, S Das, J Kim, KO Buesseler, C Breier, and E D'Alessandro. 2016. "The Uranium from Seawater Program at the Pacific Northwest National Laboratory: Overview of Marine Testing, Adsorbent Characterization, Adsorbent Durability, Adsorbent Toxicity, and Deployment Studies." Industrial and Engineering Chemistry Research 55(15):4264-4277.  doi:10.1021/acs.iecr.5b03649
  • Gill GA, LJ Kuo, JE Strivens, JR Wood, NJ Schlafer, and E D'Alessandro. 2016. Uranium from Seawater Marine Testing Program at the University of Miami's Broad Key Island Research StationPNNL-25734, Pacific Northwest National Laboratory, Richland, WA. 
  • Gill GA, LJ Kuo, JE Strivens, JR Wood, NJ Schlafer, C Tsouris, CJ Janke, S Das, R Mayes, T Saito, SS Brown, C Tsouris, CM Wai, and HB Pan. 2016. Summary of Adsorption Capacity and Adsorption Kinetics of Uranium and Other Elements on Amidoxime-based Adsorbents from Time Series Marine Testing at the Pacific Northwest National LaboratoryPNNL-25899, Pacific Northwest National Laboratory, Richland, WA. 
  • Kuo LJ, CJ Janke, JR Wood, JE Strivens, S Das, Y Oyola, RT Mayes, and GA Gill. 2016. "Characterization and Testing of Amidoxime-Based Adsorbent Materials to Extract Uranium from Natural Seawater." Industrial and Engineering Chemistry Research 55(15):4285-4293.  doi:10.1021/acs.iecr.5b03267
  • Kuo LJ, GA Gill, JE Strivens, JR Wood, NJ Schlafer, CM Wai, and HB Pan. 2016. Investigations Into the Reusability of Amidoxime-Based Polymeric Uranium AdsorbentsPNNL-25874, Pacific Northwest National Laboratory, Richland, WA. 
  • Linley TJ, EJ Krogstad, RP Mueller, GA Gill, and BK Lasorsa. 2016. "Mercury concentrations in Pacific lamprey (Entosphenus tridentatus) and sediments in the Columbia River Basin." Environmental Toxicology and Chemistry 35(10):2571-2576.  doi:10.1002/etc.3423
  • Pan HB, LJ Kuo, CM Wai, N Miyamoto, R Joshi, JR Wood, JE Strivens, CJ Janke, Y Oyola, S Das, R Mayes, and GA Gill. 2016. "Elution of Uranium and Transition Metals from Amidoxime- Based Polymer Adsorbents for Sequestering Uranium from Seawater." Industrial and Engineering Chemistry Research 55(15):4313-4320.  doi:10.1021/acs.iecr.5b03307
  • Park J, RT Jeters, LJ Kuo, JE Strivens, GA Gill, NJ Schlafer, and GT Bonheyo. 2016. "Potential impact of seawater uranium extraction on marine life." Industrial and Engineering Chemistry Research 55(15):4278-4284.  doi:10.1021/acs.iecr.5b03430
  • Park J, GA Gill, JE Strivens, LJ Kuo, RT Jeters, A Avila, JR Wood, NJ Schlafer, CJ Janke, EA Miller, M Thomas, RS Addleman, and GT Bonheyo. 2016. "Effect of biofouling on the performance of amidoxime-based polymeric uranium adsorbents." Industrial and Engineering Chemistry Research 55(15):4328-4338.  doi:10.1021/acs.iecr.5b03457

2015

2014

  • Wang T, T Khangaonkar, W Long, and GA Gill. 2014. "Development of a Kelp-type Structure Module in a Coastal Ocean Model to Assess the Hydrodynamic Impact of Seawater Uranium Extraction Technology." Journal of Marine Science and Engineering 2(1):81-92.  doi:10.3390/jmse2010081
  • Fleck J, GA Gill, BA Bergamaschi, TE Kraus, BD Downing, and CN Alpers. 2014. "Concurrent photolytic degradation of aqueous methylmercury and dissolved organic matter." Science of the Total Environment 484:263-275.  doi:10.1016/j.scitotenv.2013.03.107
  • Gill GA, LJ Kuo, JR Wood, and C Janke. 2014. Complete Laboratory Evaluation and Issue a Report on the Impact of Temperature on Uranium AdsorptionPNNL-23634, Pacific Northwest National Laboratory, Richland, WA. 
  • Kim J, C Tsouris, Y Oyola, C Janke, RT Mayes, S Dai, GA Gill, LJ Kuo, JR Wood, KY Choe, E Schneider, and H Lindner. 2014. "Uptake of Uranium from Seawater by Amidoxime-Based Polymeric Adsorbent: Field Experiments, Modeling, and Updated Economic Assessment." Industrial and Engineering Chemistry Research 53(14):6076-6083.  doi:10.1021/ie4039828
  • Saito T, S Brown, S Chatterjee, J Kim, C Tsouris, R Mayes, LJ Kuo, GA Gill, Y Oyola, C Janke, and S Dai. 2014. "Uranium Recovery from Seawater: Development of Fiber Adsorbents Prepared via Atom-Transfer Radical Polymerization." Journal of Materials Chemistry A 2(35):14674-14681.  doi:10.1039/C4TA03276D
  • Windham-Myers L, J Fleck, JT Ackerman, M Marvin-DiPasquale, C Stricker, WA Heim, P Bachand, CA Eagles-Smith, GA Gill, M Stephenson, and CN Alpers. 2014. "Mercury Cycling In Agricultural and Managed Wetlands: A Synthesis of Methylmercury Production, Hydrologic Export, and Bioaccumulation from an Integrated Field Study." Science of the Total Environment 484:221-231.  doi:10.1016/j.scitotenv.2014.01.033

2013

  • Yager JW, PR Gentry, RS Thomas, L Pluta, A Efremenko, M Black, LL Arnold, JM McKim, P Wilga, GA Gill, KY Choe, and HJ Clewell. 2013. "Evaluation of gene expression changes in human primary uroepithelial cells following 24-Hr exposures to inorganic arsenic and its methylated metabolites." Environmental and Molecular Mutagenesis 54(2):82-98.  doi:10.1002/em.21749
  • Yager JW, PR Gentry, RS Thomas, L Pluta, A Efremenko, M Black, LL Arnold, JM McKim, P Wilga, GA Gill, KY Choe, and HJ Clewell. 2013. "Evaluation of gene expression changes in human primary uroepithelial cells following 24-Hr exposures to inorganic arsenic and its methylated metabolites." Environmental and Molecular Mutagenesis 54(2):82-98.  doi:10.1002/em.21749
  • Yager JW, PR Gentry, RS Thomas, L Pluta, A Efremenko, M Black, LL Arnold, JM McKim, P Wilga, GA Gill, KY Choe, and HJ Clewell. 2013. "Evaluation of Gene Expression Changes in Human Primary Uroepithelial Cells Following 24-Hr Exposures to Inorganic Arsenic and ItsMethylatedMetabolites." Environmental and Molecular Mutagenesis 54(2):82-98.  doi:10.1002/em.21749

2012

  • Webb-Robertson BJM, HW Kreuzer, GL Hart, J Ehleringer, JB West, GA Gill, and DC Duckworth. 2012. "Bayesian Integration of Isotope Ratios for Geographic Sourcing of Castor Beans." Journal of Biomedicine and Biotechnology 2012:Article No. 450967.  doi:10.1155/2012/450967
  • Copping AE, KM Blake, LA Hanna, CA Brandt, JA Ward, JM Brandenberger, GA Gill, TJ Carlson, JL Elster, ME Jones, BE Watson, RA Jepsen, and K Metzinger. 2012. Evaluating Effects of Stressors from Marine and Hydrokinetic EnergyPNNL-21885, Pacific Northwest National Laboratory, Richland, WA. 
  • Huesemann MH, LJ Kuo, LA Urquhart, GA Gill, and G Roesijadi. 2012. "Acetone-butanol Fermentation of Marine Macroalgae." Bioresource Technology 108:305-309.  doi:10.1016/j.biortech.2011.12.148
  • Lamborg C, C Hammerschmidt, GA Gill, RP Mason, and S Gichuki. 2012. "An intercomparison of procedures for the determination of total mercury in seawater and recommendations regarding mercury speciation during GEOTRACES cruises." Limnology and Oceanography 10:90-100.  doi:10.4319/lom.2012.10.90
  • Lasorsa BK, GA Gill, and M Horvat. 2012. "Analytical Methods for Measuring Mercury in Water, Sediment and Biota." Chapter 3 in Mercury in the Environment: Pattern and Process, ed. MS Bank, pp. 24-54.  University of California Press, Berkeley, CA. 
  • Louchouarn P, LJ Kuo, JM Brandenberger, F Marcantonio, CR Garland, GA Gill, and VI Cullinan. 2012. "Pyrogenic inputs of anthropogenic Pb and Hg to sediments of the Hood Canal, Washington, in the 20th century: Source evidence from stable Pb isotopes and PAH signatures." Environmental Science & Technology 46(11):5772-5781.  doi:10.1021/es300269t

2011

2010

2008

  • Sanders RD, KH Coale, GA Gill, AH Andrews, and M Stephenson. 2008. "Recent increase in atmospheric deposition of mercury to California aquatic systems inferred from a 300-year geochronological assessment of lake sediments." Applied Geochemistry 23(3):399-407.  doi:10.1016/j.apgeochem.2007.12.021

2007

  • Cai YJ, JR Rooker, GA Gill, and JP Turner. 2007. "Bioaccumulation of mercury in pelagic fishes from the northern Gulf of Mexico." Canadian Journal of Fisheries and Aquatic Sciences 64(3):458-469.  doi:10.1139/F07-017
  • Han S, RD Lehman, KY Choe, and GA Gill. 2007. "Chemical and physical speciation of mercury in Offatts Bayou: A seasonally anoxic bayou in Galveston Bay." Limnology and Oceanography 52(4):1380-1392. 
  • Heim WA, KH Coale, M Stephenson, KY Choe, GA Gill, and C Foe. 2007. "Spatial and Habitat-Based Variations in Total and Methyl Mercury Concentrations in Surficial Sediments in the San Francisco Bay-Delta." Environmental Science & Technology 41(10):3501-3507. 
  • Huerta Vazquez AI, and GA Gill. 2007. "Determination of the Efficiency of Mixed-Acid Digestions of Sediments." Journal of Undergraduate Research VII:150. 
  • Warnken KW, PH Santschi, KA Roberts, and GA Gill. 2007. "The cycling and oxidation pathways of organic carbon in a shallow estuary along the Texas Gulf Coast." Estuarine, Coastal and Shelf Science 76(1):69-84.  doi:10.1016/j.ecss.2007.06.010

2006

  • Dellapenna TM, MA Allison, GA Gill, RD Lehman, and KW Warnken. 2006. "The impact of shrimp trawling and associated sediment resuspension in mud dominated, shallow estuaries." Estuarine, Coastal and Shelf Science 69(3-4):519-530.  doi:10.1016/j.ecss.2006.04.024

Selected Publications

2006

  • Han, S., G. A. Gill, R. D. Lehman and Key-Young Choe (2006). Complexation of mercury by dissolved organic matter in surface waters of Galveston Bay, Texas. Marine Chemistry, 98: 156-166.

2005

  • Han, S. and G. A. Gill (2005). Determination of Mercury Complexation in Coastal and Estuarine Waters using Competetitive Ligand Exchange Methods. Environmental Science and Technology, 39: 6607-6615.
  • Mason, R. P. and G. A. Gill (2005). Mercury in the Marine Environment. In: Mercury: Sources, Measurements, Cycles, and Effects, Michael B. Parsons and Jeanne B. Percival (editors), Mineralogical Association of Canada, Short Course Series Volume 34, pages 179-216, Published by the Mineralogical Association of Canada.

2004

  • Choe, K.-Y. , G. A. Gill, R. D. Lehman, S. Han, and W. A. Heim (2004). Sediment-water exchange of total mercury and monomethyl mercury in the San Francisco Bay-Delta. Limnology and Oceanography, 49: 1512-1527.
  • Laurier, F. J. G., R. P. Mason, G. A. Gill, and L. Whalin (2004). Mercury distributions in the North Pacific Ocean – 20 years of observations. Marine Chemistry, 90: 3-19.

2003

  • Choe, K.-Y. and G. A. Gill (2003). Distributions of particulate, colloidal and dissolved mercury in the San Francisco Bay estuary: 2. Monomethyl mercury. Limnology and Oceanography, 48(4): 1547-1556.
  • Choe, K.-Y., G. A. Gill and R. D. Lehman (2003). Distributions of particulate, colloidal and dissolved mercury in the San Francisco Bay estuary: 1. Total mercury. Limnology and Oceanography, 48(4): 1535-1546.
  • Warnken, K. W., G. A. Gill, R. D. Lehman, Timothy M. Dellapenna and Mead A. Allison (2003). The effects of shrimp trawling on sediment oxygen demand and the release of trace metals and nutrients from estuarine sediments. Estuarine Coastal and Shelf Science, 57: 25-42.

2002

  • Wen, L.-S. , P. H. Santschi, G. A. Gill, and D. Tang (2002). Silver concentrations in Colorado Watersheds using improved methodology, Environmental Toxicology and Chemistry, 21(10): 2040–2051.

2001

  • Choe, K.-Y. and G. A. Gill (2001). Isolation of colloidal monomethyl mercury in natural waters using cross-flow ultrafiltration techniques. Marine Chemistry, 76: 305-318.
  • Guentzel, J. L., W. M. Landing, G. A. Gill and C. D. Pollman (2001). Processes influencing rainfall deposition of mercury in Florida: The FAMS Project (1992-1996). Environmental Science and Technology, 35: 863-873.
  • Kenyon, L. O., A. M. Landry, and G. A. Gill (2001). Trace metal concentrations in blood of the Kemp’s Ridley Sea Turtle (Lepidochelys kempii). Chelonian Conservation and Biology, 4(1): 128-135
  • Warnken, K. W., G. A. Gill, L. L. Griffin, and P. H. Santschi (2001). Sediment-water exchange fluxes of Mn, Fe, Ni, and Zn in Galveston Bay, Texas. Marine Chemistry, 73: 215-231.

2000

  • Warnken, K. W., Degui Tang, Gary A. Gill and Peter H. Santschi (2000). Performance optimization of a commercially available iminodiacetate resin for use in on-line preconcentration with ICP-MS. Analytica Chimica Acta, 423: 265-276.
  • Warnken, K. W., G. A. Gill, P. H. Santschi, and L. L. Griffin (2000). Benthic exchange of nutrients in Galveston Bay, Texas. Estuaries, 23: 647-661.

Marine Sciences Laboratory

Marine Sciences Research

PNNL Websites

Resources

What's New

Salish Sea Model Website

MSL Weather Station

View Current Weather

Contact Us

Marine Sciences Laboratory
1529 W. Sequim Bay Road
Sequim, WA 98382
Phone: (360) 683-4151
Fax: (360) 681-3699