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Externally funded proposals through peer-review
Ph.D. Hydrology, 1993, New Mexico Institute of Mining and Technology, Soccoro, NM. M.S. Geochemistry, 1984, Institute of Geochemistry, Chinese Academy of Sciences, P.R.C. B.S. Chemistry, 1978, Beijing University of Iron and Steel Technology, P.R.C1997- Present: Staff Scientist, Earth Science Division, LBNL. 1995 -1997: Scientist, Earth Science Division, LBNL. 1993 - 1995: Post-doctoral, Earth Science Division, LBNL. Jiamin Wan’s main research interests are in two areas: colloid fate and transport, and reactive transport of contaminant metals in the subsurface. In studying effects of interfacial (rock-water and gas-water) phenomena on colloid transport, her research accomplishments include identifying the importance of gas-water interfaces on transport of colloids in unsaturated porous media. Her research also provided the first conceptual model on colloid filtration in unsaturated porous media. She is currently working on small-sized colloids (nanoparticles), their formation, abundance, stability, and mobility in subsurface. Her recent studies on contaminated sediments in the Hanford vadose zone have revealed the mechanisms responsible for pH neutralization and zonation of the initially highly alkaline-saline waste plumes. This helps understanding and prediction of contaminant behavior in alkaline-saline waste plumes. She is currently study uranium contamination through integration of geochemistry, soil microbiology, and vadose zone hydrology. Wan, J., J.T. Larsen, T.K. Tokunaga, Z. Zheng, pH neutralization and zonation in alkaline-saline tank waste plumes. Environ. Sci. Technol. 38, 1321-1329, 2004. Wan, J., T. K. Tokunaga, J.T. Larsen, and R. J. Serne, Geochemical evolution of highly alkaline and saline tank waste plumes during seepage through vadose zone sediments. Geochim. Cosmochim. Acta. 68, 491-502, 2004. Tokunaga, T.K., K.R. Olson, and J. Wan. Conditions necessary for capillary hysteresis in porous media: Tests of grain-size and surface tension influences. Water Resour. Res. 40, w05111, 2004. Tokunaga, T.K., J. Wan, J. Pena, S.R. Sutton, and M. Newville. Hexavalent uranium diffusion in soils from concentrated acidic and alkaline solutions. Environ. Sci. Technol. 38, 3056-3062, 2004. Zheng, Z., T. K. Tokunaga, and J. Wan. Influence of calcium carbonate on U(VI) sorption to soils. Environ. Sci. Technol. 37, 5603-5608, 2003. Tokunaga, T. K., J. Wan, T. C. Hazen, E. Schwartz, M. K. Firestone, S. R. Sutton, M. Newville, K. R. Olson, A. Lanzirotti, and W. Rao. Distribution of chromium contamination and microbial activity in soil aggregates. J. Environ. Qual. 32, 541-549, 2003. Tokunaga, T. K., J. Wan, M. K. Firestone, T. C. Hazen, K. R. Olson, D. J. Herman, S. R. Sutton, and A. Lanzirotti. In-situ reduction of Cr(VI) in heavily contaminated soils through organic carbon amendment. J. Environ. Qual. 32, 1641-1649, 2003. Tokunaga, T.K., K.R. Olson, and J. Wan. Moisture characteristics of Hanford gravels: Bulk, grain-surface, and intragranular components. Vadose Zone J. 2, 322-329, 2003. Wan, J., T.K. Tokunaga, Partitioning of clay colloids at air-water interfaces, J. Colloid Interface Sci. 247, 54-61, 2002. Tokunaga, T. K., J. Wan, and K. R. Olson. Saturation-matric potential relations in gravel. Water Resour. Res., 38(10), 1214, 2002. Tokunaga, T. K., J. Wan, M. K. Firestone, T. C. Hazen, E. Schwartz, S. R. Sutton, M. Newville, Cr diffusion and reduction in soil aggregates, 35, 3169-74,Environ. Sci. Technol, 2001. Tokunaga, T. K., and J. Wan. 2001. Approximate boundaries between different flow regimes in fractured rocks. Water Resour. Res., 37, 2103-2111, 2001. Wan, J., S. Veerapaneni, F. Gadelle, and T.K. Tokunaga, Generation of stable microbubbles and their transport through porous media, Water Resour. Res., 37, 1173-1182, 2001. Gadelle, F., J. Wan, and T.K. Tokunaga, 2001. Removal of U(VI) from contaminated sediments by surfactants, J. Environ. Qual., 30, 470-478, 2001. Tokunaga, T. K., and J. Wan, Surface-zone flow in unsaturated rock fractures, Water Resour. Res., 37, 287-296, 2001. Tokunaga, T. K., J. Wan, and S. R. Sutton. Transient film flow on rough fracture surfaces, Water Resour. Res., 36, 1737-1746, 2000. Wan, J., T.K. Tokunaga, T. Orr, and J. O'Neill, Glass casts of rock fractures: A new tool for studying flow and transport, Water Resour. Res., 36, 355-360, 2000. Veerapaneni, S., J. Wan, and T. K. Tokunaga, Particle motion in film flow, Environ. Sci. Technol., 34, 2465-2471, 2000. Wan, J. and T.K. Tokunaga, Measuring partition coefficients of colloids at air-water interfaces, Environ. Sci. Technol, 32, 3293-3298, 1998. Wan, J. and T.K. Tokunaga, Film-straining of colloids in unsaturated porous media: conceptual model and experimental testing, Environ. Sci. Technol, 31, 2413-2420, 1997. Tokunaga, T.K. and J. Wan, Water film flow along fracture surfaces of porous rock, Water Resour. Res., 33, 1287-1295, 1997. Wan, J., T.K. Tokunaga, C.F. Tsang, and G.S. Bodvarsson, Improved glass micromodel methods for studies of flow and transport in fractured porous media, Water Resour. Res., 32, 1955-1964, 1996. Wan, J., T.K. Tokunaga, and C. F. Tsang, Bacterial sedimentation through a porous medium, Water Resour. Res., 31, 1627-1636, 1995. Wan, J. and J.L. Wilson, Visualization of the role of the gas-water interface on the fate and transport of colloids in porous media, Water Resour. Res.,30, 11-23, 1994. Wan, J., J. L. Wilson, and T. L. Kieft, The effects of the gas-water interface on transport of microorganisms in unsaturated porous media, Applied and Environmental Microbiology, 60, 509-516, 1994. Wan, J. and J. L. Wilson, Colloid transport in unsaturated porous media, Water Resour. Res.,30, 857-864, 1994. Externally funded proposals through peer-review PI: Nanoparticles in the Subsurface Environments (BES) PI: Reactive transport of uranium in waste plumes (EMSP) PI: Mesoscale biotransformation dynamics of uranium (NABIR) Co-PI: Chromium bioreduction in Hanford (NABIR, T. Hazen, PI)
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