Pathways analysis method for estimating water and sediment criteria at hazardous waste sites

Fordham, Carolyn L.; Reagan, Douglas P.

doi:10.1002/etc.5620100711

Cited by 20 publications

(2 citation statements)

References 21 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The persistence of organic contaminant compounds in field sites can pose serious health hazards to both wildlife and humans that may be exposed to site-derived waters, soils, or sediments [1][2][3]. Conversely, in situ microbial activity in field sites has the potential to mineralize contaminant organic compounds, thereby eliminating toxicological risks.…”

Section: Introductionmentioning

confidence: 99%

Oxygen limitations and aging as explanations for the field persistence of naphthalene in coal tar‐contaminated surface sediments

Madsen

Mann

Bilotta

1996

Enviro Toxic and Chemistry

View full text Add to dashboard Cite

Abstract-Naphthalene has been transported approx. 400 m via groundwater flow from buried subsurface coal tar to an organic matter-rich seep area where the water emerges at the foot of a hill in a field study site. We have tested several hypotheses for explaining why naphthalene persists in seep sediments. In aerobic laboratory flask assays, conversion of 14 C-naphthalene to 14 CO 2 occurred and was not stimulated by amendments with vitamins or inorganic nutrients. Thus, neither toxicity nor nutrient limitation were the cause of naphthalene persistence. At the site, in situ sediment oxygen concentrations were below detection. Oxygenlimited naphthalene biodegradation was demonstrated both by measuring no conversion of 14 C-naphthalene to 14 CO 2 in samples of seep sediments prepared anaerobically and by measuring naphthalene loss from anaerobic nitrate-amended slurry-phase incubations of the sediment only after O 2 was added. However, when H 2 O 2 was added as an O 2 source to site sediments in situ in a randomized block design, no discernible naphthalene loss occurred. The possibility that decreased bioavailability might contribute to naphthalene persistence was investigated by monitoring 14 CO 2 evolved by microorganisms added to ␥-ray sterilized sediments that had been exposed under aseptic conditions to 14 C-labeled naphthalene for periods ranging from 0 to 28 d. Resulting patterns in the extent and rate of naphthalene mineralization revealed an inverse relationship to the duration of contact with the sediment, but only when the mixed microbial inoculum had been enriched on aqueous-phase naphthalene. We conclude that oxygen limitation is the most probable cause for lack of naphthalene biodegradation at our field study site. However, diffusion or sorption reactions may also play a role.

show abstract

Section: Introductionmentioning

confidence: 99%

Oxygen limitations and aging as explanations for the field persistence of naphthalene in coal tar‐contaminated surface sediments

Madsen

Mann

Bilotta

1996

Enviro Toxic and Chemistry

View full text Add to dashboard Cite

show abstract

“…More complex models are also used in which chemical exposure processes, assimilation in tissues, or trophic transfer are represented mechanistically [6][7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Testing of metal bioaccumulation models with measured body burdens in mice

Torres

Johnson

2001

Enviro Toxic and Chemistry

View full text Add to dashboard Cite

Estimates of chemical accumulation in prey organisms can contribute considerable uncertainty to predictive ecological risk assessments. Comparing body burdens calculated in food web models with measured tissue concentrations provides essential information about the expected accuracy of risk indices. Estimates of arsenic, cadmium, copper, lead, and nickel body burdens in house mice (Mus musculus) inhabiting a seasonal wetland were generated with two small mammal bioaccumulation models. Published soil-to-small mammal bioaccumulation regression models produced accurate estimates of arsenic and lead body burdens but failed to adequately predict copper and nickel levels in mice. Incorporating conservative prediction intervals in the regression models shows potential for successful applications in screening-level risk assessments. A simple mechanistic cumulative ingestion bioaccumulation model overpredicted lead levels in mice generally by less than one order of magnitude but greatly overpredicted concentrations of arsenic, copper, and nickel. Better estimates of absorption and elimination of ingested metals and knowledge of specific arthropod taxa in house mouse diets are likely to improve the accuracy of the cumulative ingestion model. Applying Monte Carlo simulations to the soil-small mammal regression models generated probabilistic estimates of body burdens that were consistent with deterministic results. However, deterministic minimum and maximum predictions of the ingestion model were excessively conservative (widely spaced) relative to lower and upper probabilistic percentiles. Metal levels predicted in individual mice on the basis of mouse-specific parameter values and exposures were not significantly more accurate than bioaccumulation predictions for the sitewide population.

show abstract

Ecological considerations in the practice of ecotoxicology

Hope¹

1993

Enviro Toxic and Chemistry

View full text Add to dashboard Cite

Pathways analysis method for estimating water and sediment criteria at hazardous waste sites

Cited by 20 publications

References 21 publications

Oxygen limitations and aging as explanations for the field persistence of naphthalene in coal tar‐contaminated surface sediments

Oxygen limitations and aging as explanations for the field persistence of naphthalene in coal tar‐contaminated surface sediments

Testing of metal bioaccumulation models with measured body burdens in mice

Ecological considerations in the practice of ecotoxicology

Contact Info

Product

Resources

About