Shawnee A



P.J. Rice1, T.A. Anderson2, J.C. Anhalt1, and J.R. Coats1, 1Pesticide Toxicology Laboratory, Department of Entomology, Insectary Building, Iowa State University, Ames, IA 50011, 2The Institute of Wildlife and Environmental Toxicology, Department of Environmental Toxicology, Clemson University, Pendleton, SC 29670 Terrestrial and aquatic emergent plants were used to remediate and restore soil and surface waters contaminated with glycol-based deicing agents. Rhizosphere soils from five different plant species and nonvegetated soil were treated with [14C]ethylene glycol (EG) and [14C]propylene glycol (PG) to determine the influence of vegetation on the degradation rate of these deicing agents in soil. Mineralization rates of [14C]EG and [14C]PG showed enhanced degradation in rhizosphere soils compared to nonvegetated and sterile soils. After 28 days at 0 C, 60.4%, 49.6%, and 24.4% of applied [14C]EG degraded to 14CO2 in the alfalfa (Medicago sativa), Kentucky bluegrass (Poa pratensis), and nonvegetated soils, respectively. Glycol mineralization was enhanced in all treatments with increased soil temperatures.

In addition, vegetated, nonvegetated, and sterile surface water incubation systems, contaminated with [14C]EG and [14C]PG, were studied to evaluate the use of aquatic emergent plants to remediate surface waters contaminated with glycol-based deicing agents. Elevated levels of 14CO2 in the whole-plant systems indicate accelerated mineralization in the vegetated treatments compared to the nonvegetated and sterile control treatments. After a 7-day incubation period, Scirpus fluniatilis, Scirpus acutus, and Scirpus validus enhanced the mineralization of [14C]PG by 11% to 19% and [14C]EG by 6% to 20%. Results indicate that vegetation may remediate glycol contaminated surface waters and soil, thereby reducing the environmental impact of aircraft deicing agents.

Key words: ethylene glycol, propylene glycol, phytoremediation, rhizosphere, soil

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Tuesday, May 20, 1997

Metals Kansa A

Remediation of Munitions Compounds Kansa B

Analytical Methods Kansa C/D

General Topics Kansa B

Wednesday, May 21, 1997

Metals Kansa A

Zero-Valent Metals Kansa A

Remediation Kansa A

Vegetation-based Remediation Kansa B

Partnerships & Innovative Technologies Kansa C/D

Nonaqueous Phase Liquids Kansa C/D

Thursday, May 22, 1997

Biofilms & Barriers Kansa A

Bioremediation Kansa B

Partnerships & Technology Innovations Kansa C/D

Remediation Kansa C/D


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