National Technical Reports Library

The National Technical Information Service acquires, indexes, abstracts, and archives the largest collection of U.S. government-sponsored technical reports in existence. The NTRL offers online, free and open access to these authenticated government technical reports. Technical reports and documents in its repository may be available online for free either from the issuing federal agency, the U.S. Government Publishing Office’s Federal Digital System website, or through search engines.

Details

Acute environmental toxicity and persistence of DEM, a chemical agent simulant: Diethyl malonate. Final report.

DE91009248

Publication Date	1990
Personal Author	Cataldo, D. A.; Ligotke, M. W.; Harvey, S. D.; Fellows, R. J.; Li, S. W.
Page Count	61
Abstract	The purpose of the following chemical simulant studies is to assess the potential acute environmental effects and persistence of diethyl malonate (DEM). Deposition velocities for DEM to soil surfaces ranged from 0.04 to 0.2 cm/sec. For foliar surfaces, deposition velocities ranged from 0.0002 cm/sec at low air concentrations to 0.05 cm/sec for high dose levels. The residence times or half-lives of DEM deposited to soils was 2 h for the fast component and 5 to 16 h for the residual material. DEM deposited to foliar surfaces also exhibited biphasic depuration. The half-life of the short residence time component ranged from 1 to 3 h, while the longer time component had half-times of 16 to 242 h. Volatilization and other depuration mechanisms reduce surface contaminant levels in both soils and foliage to less than 1% of initial dose within 96 h. DEM is not phytotoxic at foliar mass loading levels of less than 10 (mu)m/cm(sup 2). However, severe damage is evident at mass loading levels in excess of 17 (mu)g/cm(sup 2). Tall fescue and sagebrush were more affected than was short-needle pine, however, mass loading levels were markedly different. Regrowth of tall fescue indicated that the effects of DEM are residual, and growth rates are affected only at higher mass loadings through the second harvest. Results from in vitro testing of DEM indicated concentrations below 500 (mu)g/g dry soil generally did not negatively impact soil microbial activity. Short-term effects of DEM were more profound on soil dehydrogenase activity than on soil phosphatase activity. No enzyme inhibition or enhancement was observed after 28 days in incubation. Results of the earthworm bioassay indicate survival to be 86 and 66% at soil doses of 107 and 204 (mu)g DEM/cm(sup 2), respectively. At higher dose level, activity or mobility was judged to be affected in over 50% of the individuals. 21 refs., 10 figs., 15 tabs.
Keywords	Chemical Warfare Agents Esters Environmental Effects Acute Exposure Annelids Aquatic Ecosystems Bacteria Bioassay Biological Effects Deposition Dose-Response Relationships Enzyme Activity Evaporation Grass Leaves Pines Plants Progress Report Simulation Soils Surface Contamination Terrestrial Ecosystems Toxicity Volatility Diethyl malonate EDB/540220 EDB/560300 EDB/540320 EDB/540120
Source Agency	Technical Information Center Oak Ridge Tennessee
NTIS Subject Category	74D - Chemical, Biological, & Radiological Warfare 68 - Environmental Pollution & Control 57H - Ecology 57Y - Toxicology
Corporate Authors	Battelle Pacific Northwest Labs., Richland, WA.; Department of Energy, Washington, DC.
Supplemental Notes	Sponsored by Department of Energy, Washington, DC.
Document Type	Technical Report
Title Note	Progress rept.
NTIS Issue Number	199114
Contract Number	AC06-76RL01830

Acute environmental toxicity and persistence of DEM, a chemical agent simulant: Diethyl malonate. Final report.

Acute environmental toxicity and persistence of DEM, a chemical agent simulant: Diethyl malonate. Final report.
DE91009248

Publication Date	1990
Personal Author	Cataldo, D. A.; Ligotke, M. W.; Harvey, S. D.; Fellows, R. J.; Li, S. W.
Page Count	61
Abstract	The purpose of the following chemical simulant studies is to assess the potential acute environmental effects and persistence of diethyl malonate (DEM). Deposition velocities for DEM to soil surfaces ranged from 0.04 to 0.2 cm/sec. For foliar surfaces, deposition velocities ranged from 0.0002 cm/sec at low air concentrations to 0.05 cm/sec for high dose levels. The residence times or half-lives of DEM deposited to soils was 2 h for the fast component and 5 to 16 h for the residual material. DEM deposited to foliar surfaces also exhibited biphasic depuration. The half-life of the short residence time component ranged from 1 to 3 h, while the longer time component had half-times of 16 to 242 h. Volatilization and other depuration mechanisms reduce surface contaminant levels in both soils and foliage to less than 1% of initial dose within 96 h. DEM is not phytotoxic at foliar mass loading levels of less than 10 (mu)m/cm(sup 2). However, severe damage is evident at mass loading levels in excess of 17 (mu)g/cm(sup 2). Tall fescue and sagebrush were more affected than was short-needle pine, however, mass loading levels were markedly different. Regrowth of tall fescue indicated that the effects of DEM are residual, and growth rates are affected only at higher mass loadings through the second harvest. Results from in vitro testing of DEM indicated concentrations below 500 (mu)g/g dry soil generally did not negatively impact soil microbial activity. Short-term effects of DEM were more profound on soil dehydrogenase activity than on soil phosphatase activity. No enzyme inhibition or enhancement was observed after 28 days in incubation. Results of the earthworm bioassay indicate survival to be 86 and 66% at soil doses of 107 and 204 (mu)g DEM/cm(sup 2), respectively. At higher dose level, activity or mobility was judged to be affected in over 50% of the individuals. 21 refs., 10 figs., 15 tabs.
Keywords	Chemical Warfare Agents Esters Environmental Effects Acute Exposure Annelids Aquatic Ecosystems Bacteria Bioassay Biological Effects Deposition Dose-Response Relationships Enzyme Activity Evaporation Grass Leaves Pines Plants Progress Report Simulation Soils Surface Contamination Terrestrial Ecosystems Toxicity Volatility Diethyl malonate EDB/540220 EDB/560300 EDB/540320 EDB/540120
Source Agency	Technical Information Center Oak Ridge Tennessee
NTIS Subject Category	74D - Chemical, Biological, & Radiological Warfare 68 - Environmental Pollution & Control 57H - Ecology 57Y - Toxicology
Corporate Authors	Battelle Pacific Northwest Labs., Richland, WA.; Department of Energy, Washington, DC.
Supplemental Notes	Sponsored by Department of Energy, Washington, DC.
Document Type	Technical Report
Title Note	Progress rept.
NTIS Issue Number	199114
Contract Number	AC06-76RL01830