Publications
Below are publications from the Mercury lab.
Filter Total Items: 180
Metallothionein-like multinuclear clusters of mercury(II) and sulfur in peat
Strong mercury(II)–sulfur (Hg-SR) bonds in natural organic matter, which influence mercury bioavailability, are difficult to characterize. We report evidence for two new Hg-SR structures using X-ray absorption spectroscopy in peats from the Florida Everglades with added Hg. The first, observed at a mole ratio of organic reduced S to Hg (Sred/Hg) between 220 and 1140, is a Hg4Sx type of cluster wit
Authors
K. L. Nagy, A. Manceau, J. D. Gasper, J. N. Ryan, G. R. Aiken
Biomarkers of mercury exposure in two eastern Ukraine cities
This study evaluates biomarkers of mercury exposure among residents of Horlivka, a city in eastern Ukraine located in an area with geologic and industrial sources of environmental mercury, and residents of Artemivsk, a nearby comparison city outside the mercury-enriched area. Samples of urine, blood, hair, and nails were collected from study participants, and a questionnaire was administered to ob
Authors
H. Gibb, C. Haver, K. Kozlov, J.A. Centeno, V. Jurgenson, Allan Kolker, Kathryn M. Conko, Edward R. Landa, H. Xu
MercNet: A national monitoring network to assess responses to changing mercury emissions in the United States
A partnership of federal and state agencies, tribes, industry, and scientists from academic research and environmental organizations is establishing a national, policy-relevant mercury monitoring network, called MercNet, to address key questions concerning changes in anthropogenic mercury emissions and deposition, associated linkages to ecosystem effects, and recovery from mercury contamination. T
Authors
D. Schmeltz, D.C. Evers, C. T. Driscoll, R. Artz, M. Cohen, D. Gay, R. Haeuber, D. P. Krabbenhoft, R. Mason, K. Morris, J.G. Wiener
Mercury export from the Yukon River Basin and potential response to a changing climate
We measured mercury (Hg) concentrations and calculated export and yield from the Yukon River Basin (YRB) to quantify Hg flux from a large, permafrost-dominated, high-latitude watershed. Exports of Hg averaged 4400 kg Hg yr–1. The average annual yield for the YRB during the study period was 5.17 μg m–2 yr–1, which is 3–32 times more than Hg yields reported for 8 other major northern hemisphere rive
Authors
P. F. Schuster, Robert G. Striegl, G. R. Aiken, David P. Krabbenhoft, J. F. Dewild, K. Butler, B. Kamark, M. Dornblaser
Environmental conditions constrain the distribution and diversity of archaeal merA in Yellowstone National Park, Wyoming, U.S.A.
The distribution and phylogeny of extant protein-encoding genes recovered from geochemically diverse environments can provide insight into the physical and chemical parameters that led to the origin and which constrained the evolution of a functional process. Mercuric reductase (MerA) plays an integral role in mercury (Hg) biogeochemistry by catalyzing the transformation of Hg(II) to Hg(0). Putati
Authors
Y. Wang, E. Boyd, S. Crane, P. Lu-Irving, David P. Krabbenhoft, S. King, J. Dighton, G. Geesey, T. Barkay
Removal of inorganic mercury and methylmercury from surface waters following coagulation of dissolved organic matter with metal-based salts
The presence of inorganic mercury (IHg) and methylmercury (MeHg) in surface waters is a health concern worldwide. This study assessed the removal potential use of metal-based coagulants as a means to remove both dissolved IHg and MeHg from natural waters and provides information regarding the importance of Hg associations with the dissolved organic matter (DOM) fraction and metal hydroxides. Previ
Authors
Y.K. Henneberry, T.E.C. Kraus, J.A. Fleck, David P. Krabbenhoft, P.M. Bachand, W.R. Horwath
Mercury export from the Yukon River Basin and potential response to a changing climate
We measured mercury (Hg) concentrations and calculated export and yield from the Yukon River Basin (YRB) to quantify Hg flux from a large, permafrost-dominated, high-latitude watershed. Exports of Hg averaged 4400 kg Hg yr-1. The average annual yield for the YRB during the study period was 5.17 μg m-2 yr-1, which is 3–32 times more than Hg yields reported for 8 other major northern hemisphere rive
Authors
Paul F. Schuster, Robert G. Striegl, George R. Aiken, David P. Krabbenhoft, John F. DeWild, Kenna D. Butler, Ben Kamark, Mark Dornblaser
Sulfur in the South Florida ecosystem: Distribution, sources, biogeochemistry, impacts, and management for restoration
Sulfur is broadly recognized as a water quality issue of significance for the freshwater Florida Everglades. Roughly 60% of the remnant Everglades has surface water sulfate concentrations above 1 mg l-1, a restoration performance measure based on present sulfate levels in unenriched areas. Highly enriched marshes in the northern Everglades have average sulfate levels of 60 mg l-1. Sulfate loading
Authors
William H. Orem, C. Gilmour, D. Axelrad, David P. Krabbenhoft, D. Scheidt, P. Kalla, P. McCormick, M. Gabriel, George Aiken
Dissolved organic matter in the Florida everglades: Implications for ecosystem restoration
Dissolved organic matter (DOM) in the Florida Everglades controls a number of environmental processes important for ecosystem function including the absorption of light, mineral dissolution/precipitation, transport of hydrophobic compounds (e.g., pesticides), and the transport and reactivity of metals, such as mercury. Proposed attempts to return the Everglades to more natural flow conditions will
Authors
G. R. Aiken, C.C. Gilmour, D. P. Krabbenhoft, W. Orem
Formation of nanocolloidal metacinnabar in mercury-DOM-sulfide systems
Direct determination of mercury (Hg) speciation in sulfide-containing environments is confounded by low mercury concentrations and poor analytical sensitivity. Here we report the results of experiments designed to assess mercury speciation at environmentally relevant ratios of mercury to dissolved organic matter (DOM) (i.e., <4 nmol Hg (mg DOM)−1) by combining solid phase extraction using C18 resi
Authors
Chase A. Gerbig, Christopher S. Kim, John P. Stegemeier, Joseph N. Ryan, George R. Aiken
Diurnal trends in methylmercury concentration in a wetland adjacent to Great Salt Lake, Utah, USA
A 24-h field experiment was conducted during July 2008 at a wetland on the eastern shore of Great Salt Lake (GSL) to assess the diurnal cycling of methylmercury (MeHg). Dissolved (< 0.45 μm) MeHg showed a strong diurnal variation with consistently decreasing concentrations during daylight periods and increasing concentrations during non-daylight periods. The proportion of MeHg relative to total Hg
Authors
D. L. Naftz, J.R. Cederberg, D. P. Krabbenhoft, K.R. Beisner, J. Whitehead, J. Gardberg
Comparison of atmospheric mercury speciation and deposition at nine sites across central and eastern North America
This study presents >5 cumulative years of tropospheric mercury (Hg) speciation measurements, over the period of 2003–2009, for eight sites in the central and eastern United States and one site in coastal Puerto Rico. The purpose of this research was to identify local and regional processes that impact Hg speciation and deposition (wet + dry) across a large swath of North America. Sites sampled we
Authors
Mark A. Engle, Michael T. Tate, David P. Krabbenhoft, James J Schauer, Allan Kolker, James B. Shanley, Michael Bothner