Fate of14C dieldrin in a simulated terrestrial ecosystem

Gile, Jay D.; Gillett, James W.

doi:10.1007/bf01055145

“…These values are somewhat lower than described in the literature for similar species (e.g., Korschgen, 1970;Stickel, Stickel, and Spann, 1969;Gile and Gillett, 1979), suggesting that site-specific factors that modify bioavailability and bioaccessibility affect bioaccumulation in the field. …”

Section: Calculation Of Bafscontrasting

confidence: 57%

An approach for estimating ecological risks from organochlorine pesticides to terrestrial organisms at rocky mountain arsenal

Banton

¹

,

Klingensmith²,

Barchers³

et al. 1996

Human and Ecological Risk Assessment: An International Journal

View full text Add to dashboard Cite

Ecological risk assessment for bioaccumulative chemicals at hazardous waste sites like Rocky Mountain Arsenal (RMA) is challenging, particularly when the site is large and is characterized by heterogeneous environments and patterns of contamination. Because RMA is an National Priorities List site and a future wildlife refuge, an effective and practical risk assessment approach was required. This approach includes methods to estimate contaminant concentrations below detection limits, spatial and temporal integration, bioaccumulation, and toxicity criteria. Validation of the quantitative risk assessment approach was achieved through comparisons of observed versus predicted tissue concentration values, as well as evaluation of ecological endpoints relative to wildlife health. The results of the assessment based on this approach provide a realistic representation of observed conditions at RMA, and provide quantitative conclusions that are consistent with qualitative observations of the health and diversity of biota at RMA. In addition to supporting baseline risk assessment, the approach provides a useful framework for evaluation of future risk management alternatives.

show abstract

“…Marine microcosms are now being used to understand the complex processes which affect the fate of a chemical in the ocean where it can be transformed by the benthate community, and eventually concentrated up the food chain leading to human food (672)(673)(674)(675). Terrestrial microcosms are being used to define more precisely the fate of a chemical on soil-plantwater systems (676)(677)(678). Subsurface or aquifer microcosms have been created using special drilling techniques which allow a column of material to be removed from an aquifer in an undisturbed and uncontaminated state (689).…”

Section: Appendicesmentioning

confidence: 99%

“…Marine, freshwater, terrestrial, subsurface or aquifer, and atmospheric microcosms have been studied (643,(671)(672)(673)(674)(675)(676)(677)(678)(679)(680)(681)(682)(683)(684)(685)(686)(687)(688)(689). For example, the laboratory microcosm concept has received increasing attention recently in studies which seek to predict residential exposure to products of combustion or air pollutants (690,691).…”

Section: Chemical Exposure Assessment* Introductionmentioning

confidence: 99%

Chemical carcinogens: a review of the science and its associated principles. U.S. Interagency Staff Group on Carcinogens

1986

Environ Health Perspect

0

View full text Add to dashboard Cite

In order to articulate a view of chemical carcinogenesis that scientists generally hold in common today and to draw upon this understanding to compose guiding principles that can be used as a bases for the efforts of the regulatory agencies to establish guidelines for assessing carcinogenic risk to meet the specific requirements of the legislative acts they are charged to implement, the Office of Science and Technology Policy, Executive Office, the White House drew on the expertise of a number of regulatory agencies to elucidate present scientific views in critical areas of the major disciplines important to the process of risk assessment. The document is composed of two major sections, Principles and the State-of-the-Science. The latter consists of subsections on the mechanisms of carcinogenesis, short-term and long-term testing, and epidemiology, which are important components in the risk assessment step of hazard identification. These subsections are followed by one on exposure assessment, and a final section which includes analyses of dose-response (hazard) assessment and risk characterization. The principles are derived from considerations in each of the subsections. Because of present gaps in understanding, the principles contain judgmental (science policy) decisions on major unresolved issues as well as statements of what is generally accepted as fact. These judgments are basically assumptions which are responsible for much of the uncertainty in the process of risk assessment. There was an attempt to clearly distinguish policy and fact. The subsections of the State-of-the-Science portion provide the underlying support to the principles articulated, and to read the "Principles" section without a full appreciation of the State-of-the-Science section is to invite oversimplification and misinterpretation. Finally, suggestions are made for future research efforts which will improve the process of risk assessment.

show abstract

“…Marine, freshwater, terrestrial, subsurface or aquifer, and atmospheric microcosms have been studied (643,(671)(672)(673)(674)(675)(676)(677)(678)(679)(680)(681)(682)(683)(684)(685)(686)(687)(688)(689). For example, the laboratory microcosm concept has received increasing attention recently in studies which seek to predict residential exposure to products of combustion or air pollutants (690,691).…”

Section: Introductionmentioning

confidence: 99%

Chemical carcinogens: a review of the science and its associated principles. U.S. Interagency Staff Group on Carcinogens.

1986

Environ Health Perspect

View full text Add to dashboard Cite

In order to articulate a view of chemical carcinogenesis that scientists generally hold in common today and to draw upon this understanding to compose guiding principles that can be used as a bases for the efforts of the regulatory agencies to establish guidelines for assessing carcinogenic risk to meet the specific requirements of the legislative acts they are charged to implement, the Office of Science and Technology Policy, Executive Office, the White House drew on the expertise of a number of regulatory agencies to elucidate present scientific views in critical areas of the major disciplines important to the process of risk assessment. The document is composed of two major sections, Principles and the State-of-the-Science. The latter consists of subsections on the mechanisms of carcinogenesis, short-term and long-term testing, and epidemiology, which are important components in the risk assessment step of hazard identification. These subsections are followed by one on exposure assessment, and a final section which includes analyses of dose-response (hazard) assessment and risk characterization. The principles are derived from considerations in each of the subsections. Because of present gaps in understanding, the principles contain judgmental (science policy) decisions on major unresolved issues as well as statements of what is generally accepted as fact. These judgments are basically assumptions which are responsible for much of the uncertainty in the process of risk assessment. There was an attempt to clearly distinguish policy and fact. The subsections of the State-of-the-Science portion provide the underlying support to the principles articulated, and to read the "Principles" section without a full appreciation of the State-of-the-Science section is to invite oversimplification and misinterpretation. Finally, suggestions are made for future research efforts which will improve the process of risk assessment.

show abstract

Fate of14C dieldrin in a simulated terrestrial ecosystem

Cited by 8 publications

References 10 publications

An approach for estimating ecological risks from organochlorine pesticides to terrestrial organisms at rocky mountain arsenal

An approach for estimating ecological risks from organochlorine pesticides to terrestrial organisms at rocky mountain arsenal

Chemical carcinogens: a review of the science and its associated principles. U.S. Interagency Staff Group on Carcinogens

Chemical carcinogens: a review of the science and its associated principles. U.S. Interagency Staff Group on Carcinogens.

Contact Info

Product

Resources

About