Groundwater ubiquity score: A simple method for assessing pesticide leachability

Environmental Toxicology and Chemistry - Tập 8 Số 4 - Trang 339-357 - 1989
David I. Gustafson1
1Monsanto Agricultural Company, 700 Chesterfield Village Parkway, St. Louis, Missouri 63198

Tóm tắt

AbstractGovernment agencies at both the state and federal levels now face increasing pressures to assess the likelihood of pesticide occurrence in well‒water supplies. Screening methodologies are required in order to determine which pesticides now in use should receive the greatest attention with respect to groundwater, and in order to determine whether elaborate and expensive groundwater testing should be required in order to register a new pesticide. Several screening techniques have been proposed recently, some based on threshold values for critical physical properties of the pesticide, and others based on mathematical models of the leaching process. A different approach is taken in this paper, whereby an index is derived based entirely on the physical properties of those pesticides that have been found either leachable or essentially immobile. The index is based on graphical examination of a plot formed by two widely available pesticide properties: half‒life in soil (tsoil1/2) and partition coefficient between soil organic carbon and water (Koc). Other physical properties, such as water solubility, octanol/water partition coefficient, and volatility from soil, have often been invoked as indicators of leachability, but they are found in this paper to have no useful power in discriminating between “leachers” and “nonleachers.” Scores assigned with the new screening index agree with the results of several recent well‒water monitoring programs, even though point‒source events are thought to be responsible for some of the observed contamination. A nomogram is given that reduces the task of calculating the index to simply placing a straight edge on a diagram.

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Tài liệu tham khảo

Lyman W. J., 1982, Handbook of Chemical Property Estimation Methods: Environmental Behavior of Organic Compounds

Rao P. S. C., 1985, Indices for ranking the potential for pesticide contamination of groundwater, Proc. Soil Crop Sci. Soc. Fla., 44, 1

Wilkerson M. R., 1986, The Pesticide Contamination Prevention Act: Setting Specific Numerical Values

10.2134/jeq1987.00472425001600040022x

10.1111/j.1745-6584.1982.tb01391.x

Carsel R. F., 1984, Users Manual for the Pesticide Root Zone Model (PRZM): Release I

Dean J. D., 1984, Leaching Evaluation of Agricultural Chemicals (LEACH) Handbook

10.1021/bk-1984-0259.ch018

U.S. Environmental Protection Agency., 1987, Small Scale Prospective Study Design

10.1061/(ASCE)0733-9429(1984)110:6(707)

10.1002/ps.2780220204

Soils 5 Database.1988. University of Illinois and U.S. Army Corps of Engineers Champaign IL.

Nash R. G., 1988, Environmental Chemistry of Herbicides: Volume I, 131

Voss C. I.1984.A Finite–Element Simulation Model for Saturated–Unsaturated Fluid–Density–Dependent Groundwater Flow with Energy Transport or Chemically Reactive Single–Species Solute Transport (SUTRA). USGS Water–Resources Investigations Report 84–4369. United States Geological Survey U.S. Government Printing Office Washington DC.

10.2136/sssaj1985.03615995004900060002x

10.1080/00986448808940435

PHYS: Physical Property Database.1988. Monsanto Agricultural Company St. Louis MO.

Klaseus T. G. G. C.BuzickyandE. C.Schneider1988.Pesticides and Groundwater: Surveys of Selected Minnesota Wells. Minnesota Departments of Health and Agriculture. Minneapolis (Department of Health) and St. Paul (Department of Agriculture) MN.

Wisconsin Department of Natural Resources.1987.Summary of the Problem Assessment Monitoring Program. Madison WI.

Industrieverband Pflanzenschutz Federal Republic of Germany.1988.IPS raw water monitoring: An in–depth analysis of the occurrence of the active ingredients of pesticides in drinking water resources. Bonn West Germany.

Iowa Department of Natural Resources.1988.Pesticide and Synthetic Organic Compound Survey: Report to the Iowa General Assembly on the Results of the Water Systems Monitoring Required by House Bill 2303. Des Moines IA.

Bear J, 1972, Dynamics of Fluids in Porous Media

Dullien F. A. L., 1979, Porous Media: Fluid Transport and Pore Structure

Wang H. F., 1982, Introduction to Groundwater Modeling: Finite Difference and Finite Element Techniques

10.1139/l78-062

10.1016/0048-9697(81)90165-0

10.1017/S0022112083002116

Anderson M. P., 1984, Groundwater Contamination: Studies in Geophysics, 37

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Environmental Toxicology and Chemistry

Tập 8 Số 4

339-357

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