Nitrate Contamination -

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Sommaire:
I. Overview of Problem.- Nitrates and their Control in the EEC Aquatic Environment.- Nitrate Contamination in the Contiguous United States.- The Nitrate Content of Drinking Water in Portugal.- Nitrate Contamination of Surface and Ground Water in Greece.- II. Exposure Assessment.- Risk Analysis for Water Supply from a River Polluted by Nitrate Runoff.- Nitrogen Modeling on a Regional Scale.- Nitrate Ground-water Modeling for Agricultural and Other Nonpoint Sources.- Principles of Monitoring and Analysis.- Nitrate Balances in Aquifers.- Fertilizer and Water Application, and Control of Nitrate Pollution: Management Issues.- Integrated Water and Nitrogen Management.- Biochemistry of a Plume of Nitrate-contaminated Ground Water.- Nitrate Contamination of Ground Water in Southern Ontario and the Evidence for Denitrification.- Nutrient Transport in Two Major Catchments of Turkey.- Potential Nitrate Pollution of Ground Water in Limestone Terrain by Poultry Litter, Ozark Region, U.S.A..- Nitrogen Management Research in the President's Water Quality Initiative.- Panel Discussion: Nitrate Exposure in Agriculture.- III. Health Consequences.- Evidence that N-Nitroso Compounds Contribute to the Causation of Certain Human Cancers.- The Significance for Human Health of Nitrate, Nitrite and N-Nitroso Compounds.- Epidemiological Studies of the Endogenous Formation of N-Nitroso Compounds.- Nitrate Exposure and Human Cancer.- Development of a Reliable Measure for Determining Nitrate Exposure for Use in Epidemiological Studies.- Quantifying Gastric Nitrate and Nitrate Reductase Activity in the Normal and Achlorhydric Stomach.- Potential Health Consequences of Ground-water Contamination by Nitrates in Nebraska.- Some Factors Affecting N-Nitroso Compound Formation from Ingested Nitrate inthe Stomach: Achlorhydria, Bacterial N-Nitrosation and its Modulation.- Panel Discussion: Health Consequences.- IV. Contamination Control.- Control of Ground-water Nitrate Pollution in Britain by Land-use Change.- Nitrate Treatment Methods: An Overview.- Experience with Nitrate-Removal Methods from Drinking Water.- A Newly Developed Process for Nitrate Removal from Drinking Water.- Nitrate Pollution in Ground Water.- Mitigating Nonpoint-Source Nitrate Pollution by Riparian-Zone Denitrification.- Elimination of Ground-water Contamination by Septic-Tank Effluent.- Control of Nitrogen Sources and Principles of Treatment.- U.S. Environmental Protection Agency Programs Related to the Agricultural Use of Nitrates.- Panel Discussion: Nitrate Treatment and Control.- V. Integration: The Systems Approach.- A Mathematical Systems Model of Nitrate Contamination.- Impact of Risk-related Concerns on the U.S. Environmental Protection Agency Programs.- Nitrate Risk Management.- Panel Discussion: Integration, the Systems Approach.