Critical loads of heavy metals in a highly polluted catchment area in Egypt

被引：0

作者：

Melegy A.A. ^{[1
]}

Paces T. ^{[2
]}

机构：

[1] Dept. of Geol./Geophysical Sciences, National Research Center, Dokki, Cairo

[2] Dept. of Environmental Geochemistry, Czech Geological Survey

来源：

Chinese Journal of Geochemistry | 2004年 / 23卷 / 2期

关键词：

Critical load; Exceedance; Heavy metal; Pollution;

D O I：

10.1007/BF02868979

中图分类号：

学科分类号：

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 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.

引用

页码：155 / 162

页数：7

共 13 条

[1] Anglin-Brown B., Armour-Brown A., Lalor G.C., Preston J., Vutchkov M.K., Lead in a residential environment in Jamaica, Geochemistry and Health, 18, pp. 129-133, (1996)
[2] Anglin-Brown B., Armour-Brown A., Lalor G.C., Heavy metal pollution in Jamaica 1: Survey of cadmium, lead and zinc concentrations in the Kintyre and Hope Flat districts, Geochemistry and Health, 17, pp. 51-56, (1995)
[3] Barkman A., Applying the critical loads concept: Constraints induced by data uncertainty, Report 1 in Ecology and Environmental Engineering, 1, (1997)
[4] Bishop K., Critical loads for regional and local scales: A cautionary scientific perspective, Critical Loads and Critical Limit Values, pp. 74-76, (1994)
[5] de Vries W., Bakker D.L., Manual for Calculating Critical Loads of Heavy Metals for Terrestrial Ecosystems, Soil and Surface Waters, (1998)
[6] Lauwerys R., The Chemistry, Biochemistry and Biology of Cadmium, pp. 433-455, (1979)
[7] Melegy A., Geochemical mass balance of some toxic heavy metals in small ecosystem, Egypt, Sedimentology of Egypt, 11, pp. 185-193, (2002)
[8] Mitchell R.L., Burridge J.C., Trace elements in soils and crops, Phil. Trans. R. Soc., B288, pp. 15-24, (1979)
[9] Nilsson J., Grennfelt P., Critical Loads for Sulfur and Nitrogen, 15, (1988)
[10] Paces T., Critical loads of heavy metals in soils, A geochemical and mineralogical approach to environmental protection, Proceedings of the International School Earth and Planetary Sciences, pp. 193-204, (1998)

← 1 2 →