检索结果-南通市图书馆

Critical Loads of Heavy Metals in a Highly Polluted Catchment Area in Egypt

Chinese Journal Of Geochemistry 2004年第2期23卷 155-162页

作者： ahmed a.melegy T.Paces Department of Geological and Geophysical Sciences National Research Center Dokki Cairo EgyptDepartment of Environmental Geochemistry Czech Geological Survey 118 21 Prague The Czech Republic

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.

关键词：重金属水污染生态系统镉铅锌埃及

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Modeling Biogeochemistry, the Key for Understanding Environmental Chemistry of a Semi-Arid Soil in Egypt

引用

Chinese Journal Of Geochemistry 2003年第2期22卷 150-155页

作者： ahmed A. melegy Department of Geological and Geophysical Sciences National Research CentreDokki

Modeling geochemistry of the studied Bahtim catchment in Egypt provides a powerful tool for untangling various connections and feedbacks between atmospheric inputs, vegetation, soil and hydrology within the system. The biogeochemical PROFILE model was used to study the integrated environmental monitoring of different environmental compartments as well as calculating geochemical weathering rate. The model is in steady state and includes multi-layers which have the mineralogical, physical and chemical attributes measured for individual soil layers. In this study, the base cations (Ca+{2+}, Mg+{2+}, Na++, K++) are produced from the minerals through chemical weathering. The total chemical weathering rate of base cations is 6.5 keq+{-1}·ha+{-1}·a+{-1}. In addition, the output results indicate that a small amount of dark minerals like hornblende, pyroxene and plagioclase largely contribute the field weathering rate in Egyptian Vertisols.

关键词：生物地球化学环境化学埃及土壤植被大气水文学环境监测侵蚀速率变性土

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Hydrogeochemical Characteristics and Assessment of Water Resources in Beni Suef Governorate, Egypt

引用

Open Journal of Geology 2014年第2期4卷 44-57页

作者： ahmed melegy ahmed El-Kammar Mohamed Mokhtar Yehia Ghadir Miro Central Laboratory for Environmental Quality Monitoring National Water Department of Geological Sciences National Research Centre Dokki Egypt Department of Geology Faculty of Science Cairo University Giza Egypt

The main target of this research is to investigate the hydrogeochemical characteristics of surface and groundwater resources in Beni Suef Governorate, Egypt. A combination of major and heavy metals has been used to characterize surface and groundwater in Beni Suef Governorate, Egypt. Twenty water samples were collected from the water resources: River Nile, El-Ibrahimia canal, Bahr Youssef, irrigation and drainage channels and Quaternary aquifer. The collected water samples were analyzed for major and heavy metals. Surface and groundwater in the study area are considered potable for drink and irrigation based on the TDS and major ions concentrations. Regarding the MPL quoted by the WHO [1] and FAO [2], water resources in the study area are polluted by Al, Cd, Fe, Mn, Co and Cu. The highest concentrations of Al, Cd, Fe, Mn, Co and Cu recorded in the study area were 2545, 400, 1415, 2158, 239 and 1080 μg/l, respectively. Both surface and groundwater in Beni Suef suffer from pollution due to the impact of unsupervised anthropogenic activities including: fertilizers and pesticide, waste disposal and industrial waste, seepage from septic tanks, construction of water pipes, wastewater from El-Moheet drainage and evaporation processes during flood irrigation.

关键词： Beni Suef Surface Water Groundwater Hydrogeochemical Characteristics Heavy Metals

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：