Dr. Wenjian Lao

Wenjian Lao is a chemist who specializes in trace analysis and enantioseparation of toxic contaminants. He received his B.S. in chemistry from Xi'an Petroleum Institute in 1990, and his M.S. and Ph.D. in analytic chemistry from Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, in 1996 and 2000 respectively. Dr. Lao joined SCCWRP in 2006. His current research focuses on passive sampling (solid phase microextraction and polyethylene) method development and application, analysis of legacy pollutants and contaminants of emerging concern (CECs) in the environment.

Education

Ph.D., Analytic Chemistry, Lanzhou Institute of Chemical Physics (LICP), Chinese Academy of Sciences (CAS), 2000

M.S., Analytic Chemistry, LICP, CAS, 1996

B.S., Chemistry, Xi'an Petroleum Institute, P.R. China, 1990

Areas of Expertise

Dr. Lao specializes in environmental trace analysis, enantioseparation of chiral organic pollutants and chiral stationary phase synthesis, and passive environmental sampling technology.

Dr. Lao began his career working on sampling and analysis of persistent organic pollutants in Beijing. He participated in many oil and gas geochemical prospecting projects as an analytical chemist/engineer in China. He developed a method for rapid analysis of free hydrocarbons by gas chromatography. He has studied the synthesis, fluorescence properties and biological activities of carbazole carboxylic acids, prepared chiral stationary phases, and developed chiral separation methods for selected organic pesticides.

Before joining the Southern California Coastal Water Research Project (SCCWRP), Dr. Lao investigated enantioselectivity of imidazolinone herbicides and rodenticides in the environment. He was the lead analyst for characterizing wet and dry atmospheric deposition of selected insecticides in coastal urban watersheds. He led a study to quantify and reduce pesticide loading from commercial landscapes into receiving waters.

Currently, Dr. Lao is working on passive sampling methods, including solid phase microextraction (SPME), polyethylene devices (PEDs), and poly (methyl methacrylate) (PMMA), ultratrace levels of legacy and emerging contaminants of concern.

Professional Experience

Chemist, Southern California Coastal Water Research Project. Costa Mesa, CA. 2006-Present

Postdoctoral Researcher, University of California, Riverside, Department of Environmental Sciences. Riverside, CA. 2005-2006

Postdoctoral Associate, Mississippi State University, Chemistry Department. Mississippi State, MS. 2003-2005

Research Associate, Vanderbilt University, Department of Chemistry. Nashville, TN. 2003-2003

Research Scientist, The Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences. Beijing, P.R. China. 2001-2003

Graduate Student Researcher, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences. Lanzhou, P.R. China. 1995-2000

Engineer, Analytical Chemistry Division, Geochemical Crews, BGP Inc., China National Petroleum Corporation. Zhuozhou, P.R. China. 1990-2002

Honors and Awards

Principal investigator, China Postdoctoral Science Foundation (2001)

The Peng Yingang Science and Technology Fellowship, Chinese Academy of Science (2000)

Achievement Award of Quality Control, China National Petroleum Corporation (1995)

Professional Societies and Certifications

Board of Directors, Southern California Regional Chapter of the Society of Environmental Toxicology and Chemistry (SoCal SETAC) (2008-2010)

Hydrology & Watershed Management Committee, American Water Resources Association

American Chemical Society

Sigma Xi

Selected Presentations and Conference Proceedings

Lao W, Kim G, and Maruya K, 2017. Developing passive sampling methods for bioavailable current-used pesticides in sediment. 253rd American Chemical Society National Meeting & Exposition. San Francisco, California.

Maruya, K., Lao, W., Kim, G.B., Hong, Y., Gan, J. 2016. Extending the scope of passive sampling for contaminated sediments: standardizing ex situ methods for determination of Cfree. 7th SETAC World Congress/SETAC North America 37th Annual Meeting. November, Orlando, FL.

Flavetta G. , Lao W, K.A. Maruya. R.M. Burgess, L. Fernandez. 2016. Temporal and spatial monitoring of persistent organic pollutants on the Palos Verdes Shelf using two passive sampling methods. 7th SETAC World Congress/SETAC North America 37th Annual Meeting. November, Orlando, FL.

Hong Y, Lao W, David Tsukada D, Maruya K, Gan J. 2015. Evaluation of various polymers for equilibrium passive sampling of moderately hydrophobic emerging pollutants in water. Platform presentation at SETAC North America 36th annual meeting. November, Salt Lake City.

Lao W, Tsukada D, Maruya M. 2014. Incorporating performance reference compounds (PRCs) for passive sampling of organic contaminants using solid phase microextraction (SPME). Poster presentation at SETAC North America 35th annual meeting. November, Vancouver.

Lao W, Tsukada D, Maruya M. 2013. Correction for non-equilibrium measurement of hydrophobic organic chemicals using polyethylene passive samplers. Poster presentation at SETAC North America 34th annual meeting. November, Nashville.

Lao W, Tsukada D, Maruya M. 2012. Linkage between laboratory and field exposures of low-density polyethylene film as passive sampler in seawater. Poster presentation at SETAC North America 33rd annual meeting. November, Long Beach, CA.

Pirogovsky, M., A. Joyce, W. Lao, J. Haw, R. Adams, and K. Maruya. 2012. Calibrating Solid Phase Microextraction Passive Samplers for the In Situ Measurement of Contaminants in Southern California. American Chemical Society 243rd National Meeting & Exposition. San Diego, CA.

Joyce, A., M. Pirogovsky, W. Lao, J. Haw, R. Adams, and K. Maruya. 2012. Measurement of Polyethylene-Water partition Coefficients for In Situ Passive Sampling of Contaminants of Emerging Concern in Los Angeles, California. American Chemical Society 243rd National Meeting & Exposition. San Diego, CA.

Lao, W., L. Tiefenthaler, D. Greenstein, K.A. Maruya, S.M. Bay, and K.C. Schiff. 2011. Pyrethroids in Sediment from Southern California Coastal Environment-Bight’08 Survey. Presentation at the American Chemical Society 242nd National Meeting & Exposition. Denver, CO.

Adams, G.R, A.S. Joyce, M.S. Pirogovsky, W. Lao, J.F. Haw, and K.A. Maruya. 2011. Calibration and use of Polyethylene Passive Samplers for Quantifying Legacy and Emerging Contaminants of Concern at POTW Outfalls. Presentation at the Annual Water Environment Federation Technical Exhibition and Conference (WEFTEC). Los Angeles, CA.

Lao, W., L. Tiefenthaler, D. Greenstein, K.A. Maruya, S.M. Bay, and K.C. Schiff. 2011. Pyrethroids in Sediment from Southern California Coastal Environment-Bight’08 Survey. Presentation at SoCal SETAC Annual Meeting. Huntington Beach, CA.

Publications


Journal Articles

Lao, W., K.A. Maruya, D. Tsukada. 2019. An exponential model based new approach for correcting aqueous concentrations of hydrophobic organic chemicals measured by polyethylene passive samplers. Science of the Total Environment 646:11-18.

Jonker, M.T.O., S.A. van der Heijden, D. Adelman, J.N. Apell, R.M. Burgess, Y. Choi, L.A. Fernandez, G.M. Flavetta, U. Ghosh, P.M. Gschwend, S.E. Hale, M. Jalalizadeh, M. Khairy, M.A. Lampi, W. Lao, R. Lohman, M.J. Lydy, K.A. Maruya, S.A. Nutile, A.M.P. Oen, M.I. Rakowska, D. Reible, T.P. Rusina, F. Smedes, Y. Wu. 2018. Advancing the Use of Passive Sampling in Risk Assessment and Management of Sediments Contaminated with Hydrophobic Organic Chemicals: Results of an International Ex Situ Passive Sampling Interlaboratory Comparison. Environmental Science and Technology 52:3574-3582.

Ulrich, E.M., P.L. TenBrook, L.M. McMillan, Q. Wang, W. Lao. 2018. Enantiomer-Specific Measurements of Current-Use Pesticides in Aquatic Systems. Environmental Toxicology and Chemistry 37:99-106.

Lin, K., W. Lao, Z. Lu, F. Jia, K.A. Maruya, J. Gan. 2017. Measuring freely dissolved DDT and metabolites in seawater using solid-phase microextraction with performance reference compounds. Science of the Total Environment 599-600:364-371.

Mehinto, A.C., D.R. VanDervort, W. Lao, G. He, M.S. Denison, S.M. Vliet, D.C. Volz, R.D. Mazor, K.A. Maruya. 2017. High throughput in vitro and in vivo screening of inland waters of Southern California. Environmental Science: Processes and Impacts 19:1142-1149.

Lao, W., Y. Hong, D. Tsukada, K.A. Maruya, J. Gan. 2016. A New Film-Based Passive Sampler for Moderately Hydrophobic Organic Compounds. Environmental Science and Technology 50:13470-13476.

Crago, J., E.G. Xu, A. Kupsco, F. Jia, A.C. Mehinto, W. Lao, K.A. Maruya, J. Gan, D. Schlenk. 2016. Trophic transfer and effects of DDT in male hornyhead turbot (Pleuronichthys verticalis) from Palos Verdes Superfund site, CA (USA) and comparisons to field monitoring. Environmental Pollution 213:940-948.

Maruya, K.A., W. Lao, D. Tsukada, D.W. Diehl. 2015. A passive sampler based on solid phase microextraction (SPME) for sediment-associated organic pollutants: Comparing freely-dissolved concentration with bioaccumulation. Chemosphere 137:192-197.

Joyce, A.S., M.S. Pirogovsky, R.G. Adams, W. Lao, D. Tsukada, C.L. Cash, J.F. Hawa, K.A. Maruya. 2015. Using performance reference compound-corrected polyethylene passive samplers and caged bivalves to measure hydrophobic contaminants of concern in urban coastal seawaters. Chemosphere 127:10-17.

Fernandez, L.A., W. Lao, K.A. Maruya, R.M. Burgess. 2014. Calculating the diffusive flux of persistent organic pollutants between sediments and the water column on the Palos Verdes Shelf Superfund Site using polymeric passive samplers. Environmental Science and Technology 48:3925-3934.

Greenstein, D.J., S.M. Bay, D.L. Young, S. Asato, K.A. Maruya, W. Lao. 2014. The use of sediment toxicity identification evaluation methods to evaluate clean up targets in an urban estuary. Integrated Environmental Assessment and Management 10:260-268.

Alvarez, D.A., K.A. Maruya, N.G. Dodder, W. Lao, E.T. Furlong, K.L. Smalling. 2014. Occurrence of contaminants of emerging concern along the California coast (2009-10) using passive sampling devices. Marine Pollution Bulletin 81:347-354.

Maruya, K.A., N.G. Dodder, C.L. Tang, W. Lao, D. Tsukada. 2014. Which coastal and marine environmental contaminants are truly emerging?. Environmental Science and Pollution Research 22:1644-1652.

Fernandez, L.A., W. Lao, K.A. Maruya, C. White, R.M. Burgess. 2012. Passive sampling to measure baseline dissolved persistent organic pollutant concentrations in the water column of the Palos Verdes shelf superfund site. Environmental Science and Technology 46:11937-11947.

Lao, W., J. Gan. 2012. Enantioselective degradation of warfarin in soils. Chirality 24:54-59.

Lao, W., D. Tsukada, K.A. Maruya. 2012. The effect of co-occurring polychlorinated biphenyls on quantitation of toxaphene in fish tissue samples by gas chromatography negative ion mass spectrometry. Journal of Chromatography A 1270:262-268.

Lao, W., L.L. Tiefenthaler, D.J. Greenstein, K.A. Maruya, S.M. Bay, K. Ritter, K.C. Schiff. 2012. Pyrethroids in southern California coastal sediments. Environmental Toxicology and Chemistry 31:1649-1656.

Lao, W., K.A. Maruya, D. Tsukada. 2012. A two-component mass balance model for calibration of solid-phase microextraction fibers for pyrethroids in seawater. Analytical Chemistry 84:9362-9369.

Lao, W., J. Gan. 2010. Characterization of warfarin unusual peak profiles on oligoproline chiral high performance liquid chromatography columns. Journal of Chromatography A 1217:6545-6554.

Lao, W., J. Gan. 2010. Temperature effects on a doubly tethered diproline chiral stationary phase: Hold-up volume, enantioselectivity and robustness. Journal of Separation Science 33:3052-3059.

Lao, W., D. Tsukada, D.J. Greenstein, S.M. Bay, K.A. Maruya. 2010. Analysis, occurrence, and toxic potential of pyrethroids, and fibronil in sediments from an urban estuary. Environmental Toxicology and Chemistry 29:843-851.

Ramezani, M.K., D.P. Oliver, R.S. Kookana, W. Lao, G. Gill, C. Preston. 2010. Faster degradation of herbicidally-active enantiomer of imidazolinones in soils. Chemosphere 79:1040-1045.

Sabin, L.D., K.A. Maruya, W. Lao, D.W. Diehl, D. Tsukada, K.D. Stolzenbach, K.C. Schiff. 2010. Exchange of polycyclic aromatic hydrocarbons among the atmosphere, water, and sediment in coastal embayments of southern California, USA. Environmental Toxicology and Chemistry 29:265-274.

Lao, W., J. Gan. 2009. Doubly tethered tertiary amide linked and ionically bonded diproline chiral stationary phases. Journal of Separation Science 32:2359-2368.

Lao, W., J. Gan. 2009. Evaluation of triproline and tri-a-methylproline chiral stationary phases retention and enantioseparation associated with hydrogen bonding. Journal of Chromatography A 1216:5020-5029.

Lao, W., J. Gan. 2008. Characterization of column hold-up volume with static and dynamic methods on an immobilized polysaccharide-based chiral stationary phase. Chromatographia 67:3-7.

Technical Reports

Lin, D., J. Davis, R. Fadness, K.A. Maruya, A.C. Mehinto, W. Lao, R. Sutton, T. Jabusch, J. Sun. 2018. Pilot Monitoring of Constituents of Emerging Concern (CECs) in the Russian River Watershed (Region 1). Technical Report 1020. Southern California Coastal Water Research Project. Costa Mesa, CA.

Dodder, N., W. Lao, D. Tsukada, D.W. Diehl, K.C. Schiff. 2014. Areas of Special Biological Significance: Bioaccumulation Monitoring. Technical Report 816. Southern California Coastal Water Research Project. Costa Mesa, CA.

Schiff, K.C., R. Gossett, K. Ritter, L.L. Tiefenthaler, N. Dodder, W. Lao, K.A. Maruya. 2011. Southern California Bight 2008 Regional Monitoring Program: III. Sediment Chemistry. Technical Report 661. Southern California Coastal Water Research Project. Costa Mesa, CA.

Schiff, K.C., R. Gossett, K. Ritter, L.L. Tiefenthaler, N. Dodder, W. Lao, K.A. Maruya. 2011. Southern California Bight 2008 Regional Monitoring Program: III. Sediment Chemistry (Appendix A). Technical Report 661.A. Southern California Coastal Water Research Project. Costa Mesa, CA.

Schiff, K.C., R. Gossett, K. Ritter, L.L. Tiefenthaler, N. Dodder, W. Lao, K.A. Maruya. 2011. Southern California Bight 2008 Regional Monitoring Program: III. Sediment Chemistry (Appendix B). Technical Report 661.B. Southern California Coastal Water Research Project. Costa Mesa, CA.

Schiff, K.C., R. Gossett, K. Ritter, L.L. Tiefenthaler, N. Dodder, W. Lao, K.A. Maruya. 2011. Southern California Bight 2008 Regional Monitoring Program: III. Sediment Chemistry (Appendix C). Technical Report 661.C. Southern California Coastal Water Research Project. Costa Mesa, CA.

Schiff, K.C., R. Gossett, K. Ritter, L.L. Tiefenthaler, N. Dodder, W. Lao, K.A. Maruya. 2011. Southern California Bight 2008 Regional Monitoring Program: III. Sediment Chemistry (Appendix D). Technical Report 661.D. Southern California Coastal Water Research Project. Costa Mesa, CA.

Schiff, K.C., R. Gossett, K. Ritter, L.L. Tiefenthaler, N. Dodder, W. Lao, K.A. Maruya. 2011. Southern California Bight 2008 Regional Monitoring Program: III. Sediment Chemistry (Appendix E). Technical Report 661.E. Southern California Coastal Water Research Project. Costa Mesa, CA.

Bay, S.M., D.J. Greenstein, K.A. Maruya, W. Lao. 2010. Toxicity Identification Evaluation of Sediment (Sediment TIE) in Ballona Creek Estuary: Final Report. Technical Report 634. Southern California Coastal Water Research Project. Costa Mesa, CA.

Peng, J., K.A. Maruya, K.C. Schiff, D. Tsukada, D.W. Diehl, W. Lao, J. Gan, E. Zeng. 2007. Organochlorine pesticides and other trace organic contaminants in the Upper Newport Bay watershed. Technical Report 512. Southern California Coastal Water Research Project. Costa Mesa, CA.

Annual Report Articles

Greenstein, D.J., S.M. Bay, D. Young, S. Asato, K.A. Maruya, W. Lao. 2013. The use of sediment toxicity identification evaluation methods to evaluate clean-up targets in an urban estuary. in: K.C. Schiff, K. Miller (eds.), Southern California Coastal Water Research Project 2013 Annual Report pp. 169-181. Southern California Coastal Water Research Project. Costa Mesa, CA.

Alvarez, D., K.A. Maruya, N.G. Dodder, W. Lao, E. Furlong, K. Smalling. 2013. Occurrence of contaminants of emerging concern along the California coast (2009-10) using passive sampling devices. in: K.C. Schiff, K. Miller (eds.), Southern California Coastal Water Research Project 2013 Annual Report pp. 49-59. Southern California Coastal Water Research Project. Costa Mesa, CA.

Fernandez, L.A., W. Lao, K.A. Maruya, C. White, R.M. Burgess. 2012. Passive sampling to measure background dissolved persistent organic pollutant concentrations in the water column of the Palos Verdes Shelf Superfund site. in: S.B. Weisberg, K. Miller (eds.), Southern California Coastal Water Research Project 2012 Annual Report pp. 49-60. Southern California Coastal Water Research Project. Costa Mesa, CA.

Lao, W., D. Tsukada, K.A. Maruya. 2012. The effect of co-occurring polychlorinated biphenyls on quantitation of toxaphene in fish tissue samples by gas chromatography negative ion mass spectrometry. in: S.B. Weisberg, K. Miller (eds.), Southern California Coastal Water Research Project 2012 Annual Report pp. 61-72. Southern California Coastal Water Research Project. Costa Mesa, CA.

Lao, W., K.A. Maruya, D. Tsukada. 2012. A two-component mass balance model for calibration of solid-phase microextraction fibers for pyrethroids in seawater. in: S.B. Weisberg, K. Miller (eds.), Southern California Coastal Water Research Project 2012 Annual Report pp. 85-98. Southern California Coastal Water Research Project. Costa Mesa, CA.

Sabin, L.D., K.A. Maruya, W. Lao, D.W. Diehl, D. Tsukada, K.D. Stolzenbach, K.C. Schiff. 2011. A pilot study of air-water exchange of organochlorine compounds at three coastal estuaries in southern California. in: K.C. Schiff, K. Miller (eds.), Southern California Coastal Water Research Project 2011 Annual Report pp. 71-82. Southern California Coastal Water Research Project. Costa Mesa, CA.

Lao, W., L.L. Tiefenthaler, D.J. Greenstein, K.A. Maruya, S.M. Bay, K. Ritter, K.C. Schiff. 2011. Pyrethroids in southern California coastal sediments. in: K.C. Schiff, K. Miller (eds.), Southern California Coastal Water Research Project 2011 Annual Report pp. 249-260. Southern California Coastal Water Research Project. Costa Mesa, CA.

Lao, W., J. Gan. 2010. Temperature effects on a doubly tethered diproline chiral stationary phase: Hold-up volume, enantioselectivity and robustness. in: S.B. Weisberg, K. Miller (eds.), Southern California Coastal Water Research Project 2010 Annual Report pp. 57-66. Southern California Coastal Water Research Project. Costa Mesa, CA.

Sayre, J.M., R.G. Adams, W. Lao, K.A. Maruya. 2010. Comparing solid phase microextraction and polyethylene passive samplers for measuring ultra-low aqueous concentrations of regulated organic pollutants. in: S.B. Weisberg, K. Miller (eds.), Southern California Coastal Water Research Project 2010 Annual Report pp. 45-56. Southern California Coastal Water Research Project. Costa Mesa, CA.

Lao, W., D. Tsukada, D.J. Greenstein, S.M. Bay, K.A. Maruya. 2009. Analysis, occurrence, and toxic potential of pyrethroids and fipronil in sediments from the Ballona Creek estuary. in: K.C. Schiff, K. Miller (eds.), Southern California Coastal Water Research Project 2009 Annual Report pp. 277-289. Southern California Coastal Water Research Project. Costa Mesa, CA.

Sabin, L.D., K.A. Maruya, W. Lao, D.W. Diehl, D. Tsukada, K.D. Stolzenbach, K.C. Schiff. 2008. Exchange of polycyclic aromatic hydrocarbons between the atmosphere, water, and sediment in southern California coastal embayments. in: S.B. Weisberg, K. Miller (eds.), Southern California Coastal Water Research Project 2008 Annual Report pp. 51-64. Southern California Coastal Water Research Project. Costa Mesa, CA.