خيارات البحث
النتائج 141 - 150 من 229
Diffuse pollution IV | Diffuse pollution four | Diffuse pollution 4
2001
Yamada, K (Kiyoshi)
From the 86 oral and poster papers originally presented, 28 papers have been selected for these proceedings. They are in seven focus areas: urban issues; watershed analysis; agriculture and forestry; groundwater; modeling analysis and application; policy consideration; and application of geographic information systems.
اظهر المزيد [+] اقل [-]Water Quality Database Management
2001
Salah, A. M. (Central Laboratory for Environmental Quality Monitoring, Cairo (Egypt)) | Tawfic, T. A.
Abatement of Polar Organics in Natural Wetlands and Rivers. Analitycal Methods
2001
Headley, J. (National Water Research Centre, Cairo (Egypt)) | Tawfic, T. A.
Here are described three innovative and complementary methods for the characterization of polar organics in natural waters. A simple and rugged GC/MS procedure is shown to be well suited for the determination of sulfolane, (tetrahydrothiophene 1,1-dioxide, C4H8O2S; a water miscible chemical used in the sweetening of sour-gas) a compound that is known to be readily sequested by wetland vegetation. In contrast, LC/MS employing electrospray ionization is ideal for the quantification of two other classes of polar chemicals, namely (a) alkanolamines in vegetation and (b) mixtures of naphthenic acids in natural waters in oilsands regions of Northern Alberta, Canada. The modem techniques take advantage of quite simple extraction procedures, with no need for derivatization steps and exploit the polar nature of the chemicals to separate the analytes from high back ground non-polar components. For the alkanolamines, MS/MS is a prerequisite for obtaining diagnostic product ion scans of the molecular ion formed under soft-ionization conditions.
اظهر المزيد [+] اقل [-]Initial Environmental Evaluation Case Study Irrigation Improvement Project (Egypt)
2001
Tawfic, T. A. (Central Laboratory for Environmental Quality Monitoring, Cairo (Egypt))
Application of Geochemical Models to Study the Environmental Impacts of Discharged Industrial Effluents on Water Quality
2001
Tawfic, T. A. (Central Laboratory for Environmental Quality Monitoring, Cairo (Egypt))
Criteria for Protecting the Groundwater in Egypt
2001
Fadlelmawla, A.A.
The vitality, vulnerability, and evidence of pollution of the groundwater resources in Egypt are all necessitating the protection of the valuable resource. However, due to the historic dependence on Nile water and also due to the misconception of complete natural protection, major actions regarding regulation and protection were restricted to surface water. This situation resulted in total absence of a framework for the management of groundwater protection in the country. Experiences in Europe and the United States have shown that groundwater protection is technically a complex issue, requiring the preparation of a conceptual framework that addresses/identifies the main technical issues/tools of the protection. In this paper, a description of the criteria proposed for the groundwater protection management in Egypt is given. The criteria were prepared in the form of guidelines constituting of a conceptual framework and the technical tools needed for achieving the proposed framework. Along with the technical tools, recommendations regarding their application and other specific protection issues were given based on pilot area application.
اظهر المزيد [+] اقل [-]Microbiological Examination of Water
2001
Ezzat, S. M. (Central Laboratory for Environmental Quality Monitoring, Cairo (Egypt)) | Tawfic, T. A.
Sustainable development and fresh water management in industry
2001
El-Zarka, M. (Director of Environmental and Development Unit - Social Found for Development, Cabinet of Ministers, (Egypt))
Water Quality and Hydrology for Lakes
2001
El-Zawahry, A.
Water Quality Assessment and Control: the Case of Italy
2001
Trisorio-Liuzzi, G. (Centre International de Hautes Etudes Agronomiques Méditerranéennes, Bari (Italy). Institut Agronomique Méditerranéen) | Hamdy, A.