University of California, Riverside

Environmental Sciences



Jay Gan


Gan Research
Professor of Environmental Chemistry
jgan@ucr.edu
(951) 827-2712 (office)
(951) 827-3993 (fax)
210 Science Laboratories

Programs:

Research areas:

  • Environmental chemistry and toxicology of classic and emerging contaminants, including PCBs, DDT, PBDEs, PAHs, current-use pesticides and pharmaceutical and personal care products (PPCPs)
  • Transformation, transport, bioavailability, plant uptake and risk mitigation of organic chemicals in the environment
  • Method development for trace contaminant analysis

Jay Gan Google Scholar statistics

Dr. Jay Gan is a Professor of Environmental Chemistry in the Department of Environmental Sciences at UC Riverside, where he also served as the Department Chair in 2007-2010. He is a fellow of the American Society of Agronomy (2006), a fellow of American Association for the Advancement of Science (2008), a fellow of Soil Science Society of America (2010), and a fellow of American Chemical Society-AGRO Division (2017). Professor Gan is a Co-Editor-in-Chief for Science of the Total Environment (STOTEN). He served as the Chair of Environmental Quality Division (S11) of Soil Science Society of America (2009-11), and the Chair of Agrochemicals Division of American Chemical Society (2014-16).

Professor Gan received his Ph.D. degree from Zhejiang University in China in 1988, followed by postdoctoral training at the UN-International Atomic Energy Agency’s Laboratories in Seibersdorf, Austria (1990-91), University of Minnesota (1991-93) and the USDA George E. Brown Salinity Laboratory (1993-95), where he was also a project scientist till 2001. He joined the faculty rank at UCR in 2001. Professor Gan is the (co)author of over 260 peer-reviewed journal articles, 4 edited books, and about 30 book chapters. As of January 1, 2018, his publications received over 7500 citations (ISI Web of Knowledge), with an H-index of 49. His Google Scholar citations were 10,200, h-index 57 and i10-index 214.

View Jay Gan’s complete CV in PDF format

Research

Emerging contaminants in the environment:

Our ongoing research in this topic area includes 1) plant uptake and accumulation of pharmaceutical and personal care products (PPCPs) during treated wastewater irrigation or biosolids application, 2) transformation pathways of PPCPs in soil and metabolism in plant, and 3) abiotic and biotic processes of brominated flame retardants (BFRs) and bisphenols in the environment. Funding sources: USDA-NIFA, EPA

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Bioavailability of organic contaminants:

Organic compounds such as PCBs, PAHs, DDT, PBDEs and pyrethroid insecticides are strongly hydrophobic and they tend to sorb to solid particles and DOM. This phase partitioning behavior dictates that the bioavailability of these compounds in sediment, soil or surface water may not be directly related to their bulk chemical concentration. Our research in this area involves 1) development of bioavailability measurement methods such as solid phase microextraction (SPME), isotope dilution method (IDM), and Tenax extraction, 2) characterization of processes and factors regulating bioavailability, such as aging and black carbon types, and 3) application of bioavailability in improving risk assessment and evaluation of remediation efficiency. Funding sources: NIEHS, CDPR, PWG

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Pesticide runoff and mitigation in urban environments:

Pesticides are frequently used by home owners and professional applicators around homes to control structural pests (e.g., termites), ants, and other insects. Such uses have been associated with contamination and aquatic toxicity of urban surface streams. In collaboration with California Department of Pesticide Regulation, the State Water resources Control Board and the Pyrethroid Work Group (PWG), we have been carrying out research to 1) evaluate the sources of urban pesticide contamination, 2) understand the abiotic transformation and sorption processes of pesticides on impervious surfaces such as concrete, and 3) develop mitigation strategies and education/outreach materials for stakeholders. Funding sources: CDPR, SWRCB, PWG

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Chiral contaminants:

A high percentage of current-use pesticides and pharmaceuticals are asymmetrical molecules with chiral centers. These chiral chemicals consist of two or more stereoisomers. While enantiomers have identical physico-chemical properties, their interactions with biological macromolecules are often chiral selective, leading to enantiomer selectivity in biodegradation, ecotoxicity and human health effects. In collaboration with Prof. W.P. Liu at Zhejiang University, China, we have been conducting research to 1) develop analytical methods enabling separation of enantiomers using GC and HPLC, and 2) evaluate chiral selectivity during biodegradation, aquatic toxicity and human health effects. Funding sources: USDA

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Teaching

  • ENSC 002: Introduction to Environmental Science (Lower Division, Undergraduate Level, 240-320 students)
  • ENSC 127: Fate and transport of contaminants in soil (Upper Division, Undergraduate Level)
  • ENTX 200: Fate and Transport of Chemicals (Graduate Level)

Graduate programs:

Gan Research

Publications

Edited books

  • Gan, J., P. Zhu, S.D. Aust, and A.T. Lemley. Pesticide Decontamination and Detoxification. American Chemical Society Symposium Series 863, American Chemical Society: Washington, DC, 2003.
  • Gan, J., F. Spurlock, P. Hendley, and D. Weston. Synthetic Pyrethroids: Occurrence and Effects in Aquatic Environments. American Chemical Society Symposium Series 991, American Chemical Society: Washington, DC, 2003.
  • Goh, K., B. Bret, T. Potter, and J. Gan. Pesticide Mitigation Strategies for Surface Water Quality. American Chemical Society Symposium Series 1075, American Chemical Society: Washington, DC, 2011.
  • Garrison, A.W., J. Gan, and W.P. Liu. Chiral Pesticides: Stereoselectivity and its Consequences. American Chemical Society Symposium Series 1085, American Chemical Society: Washington, D.C. 2012.

Recent journal publications

Emerging contaminants: Transformations and plant uptake

  • Pennington, M.J., J.A. Rothman, S. L. Dudley, M. B. Jones, Q. S. McFrederick, J. Gan, and J. T. Trumble. 2017. Contaminants of emerging concern affect Trichoplusia ni growth and development on artificial diets and a key host plant. Proceedings of National Academy of Science USA. 9923–9931.
  • Sun, C.L., S. Dudley, and J. Gan. 2018. Pharmaceutical and personal care products-induced stress symptoms and detoxification mechanisms in cucumber plants. Environmental Pollution 234: 39-47.
  • Pennington, M.J., J.A. Rothman, M.B. Jones, Q.S. McFrederick, J. Gan, and J.T. Trumble. 2017. Effects of contaminants of emerging concern on Megaselia scalaris (Lowe, Diptera: Phoridae) and its Microbial Community. Scientific Reports 7: 8165, DOI:10.1038/s41598-017-08683-7
  • Fu, Q.G., J.B. Zhang, D. Schlenk, D. Borchardt, and J. Gan. 2017. Direct conjugation of emerging contaminants in higher plants: An overlooked risk? Environmental Science & Technology 51: 6071-6081.
  • Fu, Q.G., Q.F. Ye, J. Richards, and J. Gan. 2017. Metabolism of diclofenac in Arabidopsis thaliana cells: Dominance of conjugates and non-extractable residues. Environmental Pollution 222: 383-392.
  • Fu, Q.G., X.Q. Wu, Q.F. Ye, F. Ernst, and J. Gan. 2016. Biosolids inhibit bioavailability and plant uptake of triclosan and triclocarban. Water Research 102: 117-124.
  • Wu, X.Q., and J. Gan. 2016. Rapid screening of metabolism potential of pharmaceutical and personal care products (PPCPs) in plants using plant cell cultures. Environmental Pollution 211: 141-147.
  • Fu, Q.G., E. Sanganyado, Q.F. Ye, and J. Gan. 2016. Meta-analysis of biosolid effects on persistence of triclosan and triclocarban in soil. Environmental Pollution 210: 137-144.
  • Oskui, S.M., G. Diamante, C.Y. Liao, W. Shi, J. Gan, D. Schlenk, and W.H. Grover. 2016. Assessing and reducing the toxicity of 3D-printed parts. Environmental Science & Technology Letters 3: 1-6
  • Sun, J.Q., X.Q. Wu, and J. Gan. 2015. Uptake and metabolism of phthalate esters by edible plants. Environmental Science & Technology 49: 8471-8478.
  • Dodgen, L., A. Ueda, X.Q. Wu, D. Parker, and J. Gan. 2015. Effect of transpiration on plant accumulation and translocation of PPCP/EDCs. Environmental Pollution 198: 144-153.
  • Lu, Z.J., and J. Gan. 2014. Analysis, toxicity, occurrence and biodegradation of nonylphenol isomers: A review. Environmental International 73: 334-345.
  • Lu, Z.J., R. Reif-Lopez, and J. Gan. 2015. Isomeric-specific biodegradation of nonylphenol in the activated sludge bioreactor. Water Research 282-290.
  • Lin, K.D., J. Gan, and W.P. Liu. 2014. Production of hydroxylated polybrominated diphenyl ethers (HO-PBDEs) from bromophenols by bromoperoxidase-catalyzed dimerization. Environmental Science & Technology 48: 11977-11983.
  • Wu, X.Q., J. Conkle, F. Ernst, and J. Gan. 2014. Treated wastewater irrigation: Uptake of pharmaceutical and personal care products by common vegetables under field conditions Environmental Science & Technologyem> 48: 11286-11293.
  • Wu, X.Q., and J. Gan. 2015. Plant uptake of pharmaceutical and personal care products from recycled water and biosolids: A review. Science of the Total Environment 536: 655-666.
  • Dodgen, L., J. Li, X. Wu, Z. Lu, and J. Gan. 2014. Transformation and removal pathways of four PPCP/EDCs in soil. Environmental Pollution 193: 29-36.
  • Li, J.Y., Q.F. Ye, and J. Gan. 2014. Degradation and transformation products of acetaminophen in soil. Water Research 49: 44-52.
  • Lu, Z.J., and J. Gan. 2014. Isomer-specific oxidation of nonylphenol by potassium permanganate. Chemical Engineering Journal 243: 43-50.
  • Lu, Z.J., and J. Gan. 2014. Isomer-specific biodegradation of nonylphenol in river sediments. Environmental Science & Technology 48: 1008-1014.
  • Lin, K.D., C. Yan, and J. Gan. 2014. Production of hydroxylated polybrominated diphenyl ethers (OH-PBDEs) from bromophenols by manganese dioxide. Environmental Science & Technology 48: 263-271.
  • Wu, X.Q., F. Ernst, and J. Gan. 2013. Comparative uptake and translocation of pharmaceutical and personal care products (PPCPs) by common vegetables. Environmental International 60: 15-22.
  • Dodgen, L., D. Parker, and J. Gan. 2013. Uptake and accumulation of four PPCP/EDCs in two leafy vegetables. Environmental Pollution 182: 150-156.
  • Lu, Z.J., and J. Gan. 2013. Oxidation of nonylphenol and octylphenol by manganese dioxide: Kinetics and pathways. Environmental Pollution 180: 214-220.
  • Li, J.Y., L. Dodgen, Q.F. Ye, and J. Gan. 2013. Degradation kinetics and metabolites of carbamazepine in soil. Environmental Science & Technology 47: 3678-3684.
  • Wu, X.Q., J. Conkle, and J. Gan. 2012. Multi-residue determination of pharmaceutical and personal care products in vegetables. Journal of Chromatography A.1254: 78-86.
  • Bondarenko, S., J. Gan, F. Ernst, R. Green, J. Baird, and M. McCullough. Leaching of pharmaceutical and personal care products (PPCPs) in turfgrass soils during recycled water irrigation. Journal of Environmental Quality 41: 1268-1274.
  • Lu, Z.J., K.D. Lin, and J. Gan. 2011. Oxidation of bisphenol F (BPF) by manganese dioxide. Environmental Pollution 159: 2546-2551.
  • Liu, W.P., H.H. Zhang, B.P. Cao, K.D. Lin, and J. Gan. 2011. Oxidative removal of bisphenol A using zero valent aluminum-acid system. Water Research 45: 1872-1878.
  • Lin, K.D., W.P. Liu, and J. Gan. 2009. Reaction of tetrabromobisphenol A (TBBPA) with manganese dioxide: Kinetics, products, and pathways. Environmental Science & Technology 43: 4480-4486.
  • Lin, K.D., W.P. Liu, and J. Gan. 2009. Oxidative removal of bisphenol-A with manganese dioxide: Kinetics, products, and pathways. Environmental Science & Technology 43: 3860-3864.

Bioavailability: Method development and applications

  • Lin, K.D., W.J. Lao, Z.J. Lu, F. Jia, K. Maruya, and 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.
  • Liao, C.Y., A.R. Taylor, W.F. Kenney, M. Brenner, D. Schlenk, and J. Gan. 2017. Historical record and fluxes of DDTs and PCBs at the Palos Verdes Shelf Superfund site, California. Science of the Total Environment 581-582: 697-704.
  • Lao, W.J., Y.W. Hong, D. Tsukada, K. Maruya, and J. Gan. 2016. A new film-based passive sampler for moderately hydrophobic organic compounds. Environmental Science & Technology 50: 13470-13476.
  • Fu, Q.G., X.Q. Wu, Q.F. Ye, F. Ernst, and J. Gan. 2016. Biosolids inhibit bioavailability and plant uptake of triclosan and triclocarban. Water Research 102: 117-124.
  • Bao, L.J., X.Q. Wu, F. Jia, E.Y. Zeng, and J. Gan. 2016. Non-symmetrical isotopic exchange on SPME fiber in sediment under static conditions: Implications for field application of PRC calibration. Environmental Toxicology and Chemistry 35: 1978-1985.
  • Delgado-Moreno, L., L.S. Wu, and J. Gan. 2015. Application of isotope dilution method for measuring bioavailability of organic contaminants sorbed to dissolved organic matter (DOM). Aquatic Toxicology 165: 129-135.
  • Jia, F., L.J. Bao, J. Crago, D. Schlenk, and J. Gan. 2014. Use of isotope dilution method (IDM) to predict bioavailability of organic pollutants in historically contaminated sediments. Environmental Science & Technology 48: 7966-7973.
  • Jia, F., and J. Gan. 2014. Comparing black carbon types in sequestering polybrominated diphenyl ethers (PBDEs) in sediments. Environmental Pollution 184: 131-137.
  • Cui, X.Y., and J. Gan. 2013. Solid-phase microextraction (SPME) with stable isotope calibration for measuring bioavailability of hydrophobic organic contaminants. Environmental Science & Technology 47: 9833-9840.
  • Bao, L.J., JF. Jia, J. Crago, E.Y. Zeng, D. Schlenk, and J. Gan. 2013. Assessing bioavailability of DDT and metabolites in marine sediments using solid phase microextraction with performance reference compounds. Environmental Toxicology & Chemistry 32: 1946-1953.
  • Cui, X.Y., and J. Gan. 2013. Comparing sorption behavior of pyrethroids between formulated and natural sediments. Environmental Toxicology & Chemistry 32: 1033-1039.
  • Delgado-Moreno, L., and J. Gan. 2013. A stable isotope dilution method for measuring bioavailability of organic contaminants. Environmental Pollution 176: 171-177.
  • Cui, X.Y., P. Mayer, and J. Gan. 2013. Methods to assess bioavailability of hydrophobic organic contaminants: Principles, operations, and limitations. Environmental Pollution 172: 223-234.
  • Jia, F., X.Y. Cui, W. Wang, L. Delgado-Moreno, and J. Gan. 2012. Using disposable solid-phase microextraction (SPME) to determine the freely dissolved concentration of polybrominated diphenyl ethers (PBDEs) in sediments. Environmental Pollution 167: 34-40.
  • Wang, W., L. Moreno, Q.F. Ye, and J. Gan. 2011. Improved measurements of partition coefficients for polybrominated diphenyl ethers (PBDEs). Environmental Science & Technology 45: 1521-1527.
  • Cui, X.Y., W. Hunter, Y. Yang, Y.X. Chen, and J. Gan. 2010. Bioavailability of sorbed phenanthrene and permethrin in sediments to Chironomus tentans. Aquatic Toxicology 98: 83–90
  • Bondarenko, S., and J. Gan. 2009. Simultaneous determination of free and total concentrations of hydrophobic compounds. Environmental Science & Technology 43: 3772-3777.
  • Yang, Y., W. Hunter, S. Tao, and J. Gan. 2009. Microbial availability of different forms of phenanthrene in soils. Environmental Science & Technology 43: 1852-1857.
  • Hunter, W., Y. Yang, F. Reichenberg, P. Mayer, and J. Gan. 2009. Measuring pyrethroids in sediment porewater using matrix-solid phase microextraction. Environmental Toxicology & Chemistry 28: 36-43.

Pesticides: Fate, risks and mitigation

  • Richards, J., Z.J. Lu, Q.G. Fu, D. Schlenk, and J. Gan. 2017. Conversion of pyrethroid insecticides to 3-phenoxybenzoic acid on urban hard surfaces. Environmental Science & Technology Letters 4: 546-550.
  • Liao, C.Y., J. Richards, A. Taylor, and J. Gan. 2017. Development of polyurethane-based passive samplers for ambient monitoring of urban-use insecticides in water. Environmental Pollution 231: 1412-1420
  • Bertotto, L., J. Richards, J Gan, D. Volz, and D. Schlenk. 2018. Effects of bifenthrin exposure on the estrogenic and dopaminergic pathways in zebrafish embryos and juveniles. Environmental Toxicology & Chemistry 37: 236-246.
  • Xue, J.Y., C.Y. Liao, J. Wang, Z. Cryder, T.B. Xu, F.M Liu, and J. Gan. 2017. Development of passive samplers for in situ measurement of pyrethroid insecticides in surface water. Environmental Pollution 224: 516-523
  • Richards, J., R. Reif, Y.Z. Luo, and J. Gan. 2016. Distribution of pesticides in dust particles in urban environments. Environmental Pollution 214: 290-298.
  • Jiang, W.Y., J. Conkle, Y.Z. Luo, J.Y. Li, K. Xu, and J. Gan. 2016. Occurrence, distribution and accumulation of pesticides in exterior residential areas. Environmental Science & Technology 50: 12592−12601
  • Jiang, W.Y., and J. Gan. 2016. Conversion of pesticides to biologically active products on urban hard surfaces. Science of the Total Environment 556: 63-69.
  • Shen, G.Q., D.J. Ashworth, J. Gan, and S.R. Yates. 2016. Biochar amendment to the soil surface reduces fumigant emissions and enhances soil microorganism recovery. Environmental Science & Technology 50: 1182-1189.
  • Zhang, J.Y., J. Zhang, J. Gan, J. Liu, and W.P. Liu. 2016. Endocrine disrupting effects of pesticides through interference with human glucocorticoid receptor. Environmental Science & Technologyem> 50: 435-443
  • Kookana, R.S., A.B.A. Boxall, P.T. Reeves, R. Ashauer, S. Beulke, Q. Chaudhry, G. Cornelis, T.F. Fernandes, J. Gan, M. Kah, I. Lynch, J. Rannville, C. Sinclair, D. Spurgeon, K. Tiede, and P.J. van den Brink. 2014. Nanopesticides: Guiding principles for regulatory evaluation of environmental risks. Journal of Agricultural and Food Chemistry 62: 4227-4240.
  • Luo, Y.Z., F. Spurlock, W.Y. Jiang, B.C. Jorgenson, T. Young, J. Gan, S. Gill, and K.S. Goh. 2013. Pesticide washoff from concrete surfaces: literature review and a new modeling approach. Water Research 47: 3163-3172.
  • Jiang, W.Y., and J. Gan. 2012. Importance of fine particles in pesticide runoff from concrete surfaces and its prediction. Environmental Science & Technology 46: 6028-6034.
  • Gan, J., S. Bondarenko, L. Oki, D. Haver, and J.X. Li. 2012. Occurrence of fipronil and its biologically active derivatives in urban residential runoff. Environmental Science & Technology 46: 1489-1495.
  • Jiang, W.Y., D. Haver, M. Rust, and J. Gan. 2012. Runoff of pyrethroid insecticides from concrete surfaces following simulated and natural rainfalls. Water Research 46: 645-652.
  • Jiang, W., J. Gan, and D. Haver. 2011. Sorption and desorption of pyrethroid insecticide permethrin on concrete. Environmental Science & Technology 45: 602-607.
  • Delgado-Moreno, L., L. Wu, and J. Gan. 2010. Effect of dissolved organic carbon on sorption of pyrethroids to sediments. Environmental Science & Technology 44: 8473-8478.
  • Jiang, W., K. Lin, D. Haver, S. Qin, F. Spurlock, and J. Gan. 2010. Wash-off potential of urban use insecticides on concrete surfaces. Environmental Toxicology and Chemistry 29: 1203-1208.
  • Budd, R., A. O’Geen, K. Goh, S. Bondarenko, and J. Gan. 2009. Efficacy of constructed wetlands in pesticide removal from tailwaters in the Central Valley, California. Environmental Science & Technology 43: 2925-2930.
  • Gan, J., Q. Wang, S.R. Yates, W.C. Koskinen and W.A. Jury. 2002. Dechlorination of chloroacetanilide herbicides by thiosulfate salts. Proceedings of National Academy of Sciences (USA) 99: 5189-5194.

Chirality: Method development and toxicology

  • Sanganyado, E., Z.J. Lu, Q.G. Fu, D. Schlenk, and J. Gan. 2017. Chiral pharmaceuticals: A review on their environmental occurrence and fate processes. Water research 124: 527-542.
  • Sanganyado, E., Q.G. Fu, and J. Gan. 2016. Enantiomeric selectivity in adsorption of chiral -blockers on sludge. Environmental Pollution 214: 787-794.
  • Sanganyado, E., Z. Lu, and J. Gan. 2014. Mechanistic insights on chaotropic interactions of liophilic ions with basic pharmaceuticals in polar ionic mode liquid chromatography. J. Chromatography A 1368: 82-88.
  • Lao, W.J., and J. Gan. 2012. Enantioselective degradation of warfarin in soils. Chirality 24: 54-59
  • Delgado-Moreno, L., K.D. Lin, R. Veiga- Nascimento, and J. Gan. 2011. Occurrence and toxicity of three classes of insecticides in water and sediment in two Southern California Coastal watersheds. Journal of Agricultural and Food Chemistry 59: 9448-9456.
  • Lao, W.J., and 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.
  • Nillos, M.G., S. Chajkowski, J.R. Rimoldi, J. Gan, R. Lavado, and D. Schlenk. 2010. Stereoselective biotransformation of permethrin to estrogenic metabolites in fish. Chemical Research in Toxicology 23: 1568-1575.
  • Lao, W.J., and J. Gan. Characterization of warfarin unusual peak profiles on oligoproline chiral high performance liquid chromatography columns. Journal of Chromatography A. 1217: 6545-6554.
  • Nillos, M.G., J. Gan, and D. Schlenk. 2010. Chirality of organophophorus pesticides: Analysis and toxicity. Journal of Chromatography B 878:1277-1284.
  • Nillos, M.G., S.J. Qin, C. Larive, D. Schlenk, and J. Gan. 2009. Epimerization of cypermethrin stereoisomers in alcohols. Journal of Agricultural & Food Chemistry 57: 6938-6943.
  • Nillos, M., K. Lin, J. Gan, S. Bondarenko, and D. Schlenk. 2009. Enantioselectivity in fipronil aquatic toxicity and degradation. Environmental Toxicology & Chemistry 28: 1825-1833.
  • Liu, W.P., J. Gan, D. Schlenk and W.A. Jury. 2005. Enantioselectivity in environmental safety of current chiral insecticides. Proceedings of National Academy of Sciences (USA) 103: 701-706.

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University of California, Riverside
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Riverside, CA 92521
Tel: (951) 827-1012

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Fax: (951) 827-4652

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