Publications
Dive into our publications and explore the science from the Environmental Health Program (Toxic Substances Hydrology and Contaminant Biology).
Filter Total Items: 4094
Crude oil at the Bemidji Site: 25 years of monitoring, modeling, and understanding
The fate of hydrocarbons in the subsurface near Bemidji, Minnesota, has been investigated by a multidisciplinary group of scientists for over a quarter century. Research at Bemidji has involved extensive investigations of multiphase flow and transport, volatilization, dissolution, geochemical interactions, microbial populations, and biodegradation with the goal of providing an improved understandi
Authors
Hedeff I. Essaid, Barbara A. Bekins, William N. Herkelrath, Geoffrey N. Delin
Guest comment: Nanoscale metal−organic matter interactions
No abstract available.
Authors
George Aiken, Helen Hsu-Kim, Joe Ryan, Pedro F. Alvarez
A tree-ring reconstruction of the salinity gradient in the northern estuary of San Francisco Bay
Blue oak tree-ring chronologies correlate highly with winter–spring precipitation totals over California, with Sacramento and San Joaquin river stream flow, and with seasonal variations in the salinity gradient in San Francisco Bay. The convergence of fresh and saline currents can influence turbidity, sediment accumulation, and biological productivity in the estuary. Three selected blue oak chrono
Authors
David W. Stahle, Daniel Griffin, Malcolm K. Cleaveland, Jesse R. Edmondson, D.J. Burnette, John T. Abatzoglou, Kelly Redmond, David M. Meko, Michael D. Dettinger, Daniel Cayan, Matthew D. Therrell
The effects of wetland restoration on mercury bioaccumulation in the South Bay Salt Pond Restoration Project: Using the biosentinel toolbox to monitor changes across multiple habitats and spatial scales
The project was initiated in April 2010, and to date has included four sampling events of surface water (April, May, June/July, and August 2010) and five sampling events of biota (April, May, June/July, August, and September 2010) and three sampling events for surface sediment (May, June/July, and August 2010). This annual report briefly summarizes our progress to date.
Authors
Josh T. Ackerman, Mark Marvin-DiPasquale, Darell Slotton, Mark P. Herzog, Collin A. Eagles-Smith
Modeling the fate and transport of polyaromatic hydrocarbons in the saturated zone, Grand Isle, Louisiana
No abstract available.
Authors
Francis H. Chapelle, Mark A. Widdowson
Quantifying solute transport processes: Are chemically "conservative" tracers electrically conservative?
The concept of a nonreactive or conservative tracer, commonly invoked in investigations of solute transport, requires additional study in the context of electrical geophysical monitoring. Tracers that are commonly considered conservative may undergo reactive processes, such as ion exchange, thus changing the aqueous composition of the system. As a result, the measured electrical conductivity may r
Authors
Kamini Singha, Li Li, Frederick D. Day-Lewis, Aaron B. Regberg
Integrating field observations and inverse and forward modeling: application at a site with acidic, heavy-metal-contaminated groundwater
No abstract available.
Authors
Pierre D. Glynn, James G. Brown
Nanoparticles formed from bacterial oxyanion reduction of toxic Group 15 and 16 metalloids
This chapter presents some examples of nanoparticles formed by only a few microbial species that are cultivated in only a handful of laboratories worldwide. The investigations so far have just scratched the surface of the potential of the natural world to yield bionanomineral producers. While future research should involve screening surveys of the prokaryotes for this biomineralizing phenomenon, m
Authors
C.I. Pearce, S. Baseman, J.W. Fellowes, Ronald S. Oremland
Hydrology and biogeochemistry linkages
This chapter provides an overview of the linkages between hydrology and biogeochemistry in terrestrial and aquatic systems. Selected topics include hydrological pathways on drainage basin slopes, mountain environments, within-river (or in-stream) processes, wetlands, groundwater (and groundwater–surface water interactions), and lakes. Beginning from catchment headwaters, This chapter introduces me
Authors
Norman E. Peters, J. K. Bohlke, P. D. Brooks, T.P. Burt, Michael N. Gooseff, David P. Hamilton, P. J. Mulholland, Nigel Roulet, J.V. Turner
Long-term natural attenuation of crude oil in the subsurface
The time frame for natural attenuation of crude oil contamination in the subsurface has been studied for the last 27 years at a spill site located near Bemidji, Minnesota, USA. Data from thegroundwater contaminant plume show that dissolved benzene concentrations adjacent to the oil decreased by 50% between 1993 and 2007. To assess how this decrease is related to benzeneconcentrations in the crude
Authors
Barbara A. Bekins, Mary Jo Baedecker, Robert P. Eganhouse, William N. Herkelrath