Publications
Dive into our publications and explore the science from the Environmental Health Program (Toxic Substances Hydrology and Contaminant Biology).
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Characterizing the oxygen isotopic composition of phosphate sources to aquatic ecosystems
The oxygen isotopic composition of dissolved inorganic phosphate (δ18Op) in many aquatic ecosystems is not in isotopic equilibrium with ambient water and, therefore, may reflect the source δ18Op. Identification of phosphate sources to water bodies is critical for designing best management practices for phosphate load reduction to control eutrophication. In order for δ18O p to be a useful tool for
Authors
M.B. Young, K. McLaughlin, C. Kendall, W. Stringfellow, M. Rollog, K. Elsbury, E. Donald, A. Paytan
Arsenite and ferrous iron oxidation linked to chemolithotrophic denitrification for the immobilization of arsenic in anoxic environments
The objective of this study was to explore a bioremediation strategy based on injecting NO3− to support the anoxic oxidation of ferrous iron (Fe(II)) and arsenite (As(III)) in the subsurface as a means to immobilize As in the form of arsenate (As(V)) adsorbed onto biogenic ferric (Fe(III)) (hydr)oxides. Continuous flow sand filled columns were used to simulate a natural anaerobic groundwater and s
Authors
W. Sun, R. Sierra-Alvarez, L. Milner, R. Oremland, J.A. Field
Application of iron and zinc isotopes to track the sources and mechanisms of metal loading in a mountain watershed
Here the hydrogeochemical constraints of a tracer dilution study are combined with Fe and Zn isotopic measurements to pinpoint metal loading sources and attenuation mechanisms in an alpine watershed impacted by acid mine drainage. In the tested mountain catchment, δ56Fe and δ66Zn isotopic signatures of filtered stream water samples varied by ∼3.5‰ and 0.4‰, respectively. The inherent differences i
Authors
D.M. Borrok, R. B. Wanty, Ridley W. Ian, P. J. Lamothe, B. A. Kimball, P. L. Verplanck, R.L. Runkel
Isoscapes to address large-scale earth science challenges
No abstract available.
Authors
G.J. Bowen, J. B. West, B. H. Vaughn, T. E. Dawson, J.R. Ehleringer, M. L. Fogel, K. Hobson, J. Hoogewerff, C. Kendall, C.-T. Lai, C.C. Miller, D. Noone, H. Schwarcz, C.J. Still
Investigating different mechanisms for biogenic selenite transformations: Geobacter sulfurreducens, Shewanella oneidensis and Veillonella atypica
The metal-reducing bacteria Geobacter sulfurreducens, Shewanella oneidensis and Veillonella atypica, use different mechanisms to transform toxic, bioavailable sodium selenite to less toxic, non-mobile elemental selenium and then to selenide in anaerobic environments, offering the potential for in situ and ex situ bioremediation of contaminated soils, sediments, industrial effluents, and agricultur
Authors
C.I. Pearce, R.A.D. Pattrick, N. Law, J.M. Charnock, V.S. Coker, J.W. Fellowes, R.S. Oremland, J.R. Lloyd
Benthic methylmercury production in lacustrine ecosystems of Nahuel Huapi National Park, Patagonia, Argentina
Seasonal trends of benthic methylmercury (methyl-Hg) production were examined in both littoral and open water sites of three lakes (Escondido, Moreno, and Morenito) in the North Andean Patagonia region of Argentina. Potentials of methyl-Hg production were measured by amending sediment samples with inorganic 197Hg(II), incubating for either 24 and 32 h at room temperature, and subsequently assaying
Authors
Guevara S. Ribeiro, S.P. Catan, M. Marvin-DiPasquale
Effect of grain-coating mineralogy on nitrate and sulfate storage in the unsaturated zone
Unsaturated-zone sediments and the chemistry of shallow groundwater underlying a small (∼8-km2) watershed were studied to identify the mechanisms responsible for anion storage within the Miocene Bridgeton Formation and weathered Coastal Plain deposits in southern New Jersey. Lower unsaturated-zone sediments and shallow groundwater samples were collected and concentrations of selected ions (includi
Authors
T. J. Reilly, N.S. Fishman, A. L. Baehr
The occurrence of glyphosate, atrazine, and other pesticides in vernal pools and adjacent streams in Washington, DC, Maryland, Iowa, and Wyoming, 2005-2006
Vernal pools are sensitive environments that provide critical habitat for many species, including amphibians. These small water bodies are not always protected by pesticide label requirements for no-spray buffer zones, and the occurrence of pesticides in them is poorly documented. In this study, we investigated the occurrence of glyphosate, its primary degradation product aminomethylphosphonic aci
Authors
William A. Battaglin, Karen C. Rice, Michael J. Focazio, Sue Salmons, Robert X. Barry
Benthic nutrient sources to hypereutrophic Upper Klamath Lake, Oregon, USA
Three collecting trips were coordinated in April, May, and August 2006 to sample the water column and benthos of hypereutrophic Upper Klamath Lake (OR, USA) through the annual cyanophyte bloom of Aphanizomenon flos‐aquae. A pore‐water profiler was designed and fabricated to obtain the first high‐resolution (centimeter‐scale) estimates of the vertical concentration gradients of macro‐ and micronutr
Authors
J.S. Kuwabara, B.R. Topping, D. D. Lynch, J.L. Carter, H.I. Essaid
An ecological risk assessment of the acute and chronic effects of the herbicide clopyralid to rainbow trout (Oncorhynchus mykiss)
Clopyralid (3,6-dichloro-2-pyridinecarboxylic acid) is a pyridine herbicide frequently used to control invasive, noxious weeds in the northwestern United States. Clopyralid exhibits low acute toxicity to fish, including the rainbow trout (Oncorhynchus mykiss) and the threatened bull trout (Salvelinus confluentus). However, there are no published chronic toxicity data for clopyralid and fish that c
Authors
J.F. Fairchild, A.L. Allert, K.P. Feltz, K.J. Nelson, J.A. Valle
Behavioral response and kinetics of terrestrial atrazine exposure in American toads (bufo americanus)
Amphibians in terrestrial environments obtain water through a highly vascularized pelvic patch of skin. Chemicals can also be exchanged across this patch. Atrazine (ATZ), a widespread herbicide, continues to be a concern among amphibian ecologists based on potential exposure and toxicity. Few studies have examined its impact on the terrestrial juvenile or adult stages of toads. In the current stud
Authors
Mendez S.I. Storrs, D. E. Tillitt, T.A.G. Rittenhouse, R. D. Semlitsch
Complete and draft genome sequences of six members of the aquificales
The Aquificales are widespread in marine and terrestrial hydrothermal environments. Here, we report the complete and draft genome sequences of six new members of the Aquificales: two marine species, Persephonella marina strain EX-H1 and Hydrogenivirga strain 128-5-R1 (from the East Pacific Rise, 9°50.3′N, 104°17.5′W, and the Eastern Lau Spreading Center, 176°11.5′W, 20°45.8′S, respectively), and f
Authors
A.-L. Reysenbach, N. Hamamura, M. Podar, E. Griffiths, S. Ferreira, R. Hochstein, J. Heidelberg, J. Johnson, D. Mead, A. Pohorille, M. Sarmiento, K. Sehweighofer, R. Seshadri, M.A. Voytek