| Critical Loads of Heavy Metals in a Highly Polluted Catchment Area in Egypt |
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| 引用本文： | AhmedA.Melegy T.Paces. Critical Loads of Heavy Metals in a Highly Polluted Catchment Area in Egypt[J]. 中国地球化学学报, 2004, 23(2): 155-162. DOI: 10.1007/BF02868979 |
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| 作者姓名： | AhmedA.Melegy T.Paces |
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| 作者单位： | [1]DepartmentofGeologicalandGeophysicalSciences,NationalResearchCenter,Dokki,Cairo,Egypt [2]DepartmentofEnvironmentalGeochemistry,CzechGeologicalSurvey,11821Prague,TheCzechRepublic |
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| 摘 要： | Heavy metals in different environmental compartments can be hazardous to ecosystems. Budgets of Cd, Pb and Zn in small ecosystems of the Shubra E1-Kheima area in Egypt are presented. The budgets are not in steady state because they change with time. So the concentrations of the metals are a function of time. The critical loads of heavy metals to soils can be calculated from an inventory of inputs and outputs of the trace components in the catchment area.Critical time is an important parameter for critical load evaluation because it can indicate which of the heavy metals may be the most acute threat to the soils. Egyptian soil in the Shubra ElKheima area seems to be in danger of heavy metal pollution by Zn, Cd and Pb. The calculated critical loads and their exceedances are approximate indicators of the hazards in the soil system.The critical time is a warning signal to initiate an environmental evaluation of possible pollution hazards.
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| 关 键 词： | 重金属 水污染 生态系统 镉 铅 锌 埃及 |
| 收稿时间： | 2005-06-17 |
Critical loads of heavy metals in a highly polluted catchment area in Egypt |
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| Ahmed A. Melegy,T. Paces. Critical loads of heavy metals in a highly polluted catchment area in Egypt[J]. Chinese Journal of Geochemistry, 2004, 23(2): 155-162. DOI: 10.1007/BF02868979 |
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| Authors: | Ahmed A. Melegy T. Paces |
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| Affiliation: | (1) Department of Geological and Geophysical Sciences, National Research Center, Dokki, Cairo, Egypt;(2) Department of Environmental Geochemistry, Czech Geological Survey, 118 21 Prague, The Czech Republic |
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| Abstract: | Heavy metals in different environmental compartments can be hazardous to ecosystems. Budgets of Cd, Pb and Zn in small ecosystems of the Shubra El-Kheima area in Egypt are presented. The budgets are not in steady state because they change with time. So the concentrations of the metals are a function of time. The critical loads of heavy metals to soils can be calculated from an inventory of inputs and outputs of the trace components in the catchment area. Critical time is an important parameter for critical load evaluation because it can indicate which of the heavy metals may be the most acute threat to the soils. Egyptian soil in the Shubra El-Kheima area seems to be in danger of heavy metal pollution by Zn, Cd and Pb. The calculated critical loads and their exceedances are approximate indicators of the hazards in the soil system. The critical time is a warning signal to initiate an environmental evaluation of possible pollution hazards. |
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| Keywords: | heavy metal critical load exceedance pollution |
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