Ecological Effects of Metals in Streams on a Defense Materials Processing Site in South Carolina, USA

Paller, Michael H.; Dyer, Susan A.

doi:10.1080/10807039.2010.512255

Cited by 4 publications

(1 citation statement)

References 14 publications

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“…DGT concentrations in the streams were calculated for Cd, Cu, Mn, Pb, and Zn, selected because of their possible presence as legacy contaminants (Paller and Dyer 2010). Cu, Pb, and Zn were measured in the laboratory study.…”

Section: Processing Dgt Probesmentioning

confidence: 99%

Use of diffusive gradients in thin films (DGT) to measure potentially bioavailable metals in southeastern USA blackwater streams

Paller

Knox

Blas

et al. 2022

Environ Monit Assess

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We used Diffusive Gradients in Thin Films (DGT) to measure potentially bioavailable metals in coastal plain streams in the southeastern USA that exhibited strong to moderate blackwater characteristics. Metals were partitioned into particulate metals, DGT inert metals (i.e., colloidal and refractory organic complexes not accumulated by DGT), and DGT labile metals (i.e., free metal ions, small inorganic complexes, and labile organic complexes). We also examined the influence of different DGT deployment times using data collected from the field and a follow-up laboratory study. The DGT measured fraction of dissolved metals in the streams was 15% for Cd, 21% for Zn, 33% for Cu, 37% for Pb, and 98% for Mn. Metals bound to particulates predominated only for Pb. Most of the Cd, Pb, Zn, and Cu was associated with colloids, refractory organic complexes, or particles. Relatively small amounts were in free ion or labile complexes likely to be bioavailable through respiratory surfaces. Modeled concentrations of free and inorganically bound Cu and Pb were lower than the DGT fraction indicating that DGT accumulated some organically bound Cu and Pb that might not have been bioavailable. DGT exposure times in excess of five days may have contributed to the accumulation of partly labile organic-metal complexes and were associated with substantial biofouling that caused metal uptake by DGT to depart from linearity.

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Section: Processing Dgt Probesmentioning

confidence: 99%

Use of diffusive gradients in thin films (DGT) to measure potentially bioavailable metals in southeastern USA blackwater streams

Paller

Knox

Blas

et al. 2022

Environ Monit Assess

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The development and use of a spatially explicit model for river otters to evaluate environmental hazards: a case study on the Department of Energy’s Savannah River Site

McCallen

Gaines

Novak

et al. 2018

Environ Monit Assess

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The Department of Energy's (DOE) Savannah River Site (SRS) faces a legacy of radionuclide and metal contamination from industrial processes that occurred throughout the site. Northern river otters (Lontra canadensis) are appropriate receptors for studying the effects of long-term, low-level contamination because they are long-lived, higher trophic level organisms susceptible to accumulating high levels of pollutants. The purpose of this study was to use latrine surveys to examine patterns of wetland latrine usage; explicitly model northern river otter resource selection on the landscape level; and utilize the model results within an ecological risk assessment (ERA) framework to assess potential effects of metals and radiocesium (Cs) on the population for the SRS as a case study. River drainages and associated wetlands were surveyed for latrine sites and scats were collected and analyzed for Cs activity to validate model results. The spatially explicit resource model predicted otter drainage reach use and was used in an ERA to develop exposure models for nine heavy metals as well asCs on the SRS population of river otters. The evaluation predicted that the only contaminant occurring at high enough levels to cause population effects was mercury and that the observed concentrations were probably not high enough to cause significant impairment. However, multiple metals were above action level thresholds. The field validation process showed an unexpected preference for one man-made treatment wetland that was heavily contaminated, showing that the ERA process is complex and must be approached using multiple scales.

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A Spatially Explicit Model to Predict Radiocesium Body Burdens of White-Tailed Deer on the U.S. Department of Energy's Savannah River Site

Bobryk

Gaines

Novak

et al. 2013

Human and Ecological Risk Assessment: An International Journal

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Ecological Effects of Metals in Streams on a Defense Materials Processing Site in South Carolina, USA

Cited by 4 publications

References 14 publications

Use of diffusive gradients in thin films (DGT) to measure potentially bioavailable metals in southeastern USA blackwater streams

Use of diffusive gradients in thin films (DGT) to measure potentially bioavailable metals in southeastern USA blackwater streams

The development and use of a spatially explicit model for river otters to evaluate environmental hazards: a case study on the Department of Energy’s Savannah River Site

A Spatially Explicit Model to Predict Radiocesium Body Burdens of White-Tailed Deer on the U.S. Department of Energy's Savannah River Site

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