NDLI: Metal pollution in carbonate sediments of main basin of Mariute Lake, Alexandria, Egypt

Content Provider	Springer Nature Link
Author	El Masry, Kamel I. Friedman, Gerald M.
Copyright Year	2000
Abstract	Lakes are ideal in defining the processes that govern the behavior of heavy metals in sediments: they are closed systems with well-known characteristics (input, outputs) and contain a memory for dynamic bottom processes (erosion, accumulation, and transportation). Lakes integrate and represent environmental conditions, in contrast with the wide variability in the water column and in open marine systems.Lake Mariute is one of four shallow, brackish-water lakes adjoining the Mediterranean coast near Alexandria, Egypt. Eleven bottom-sediment samples were collected from different sites within Lake Mariute. Flame Atomic Absorption Spectrometry (AAS) was used to determine Co, Cu, Pb, Fe, Ni, and Zn concentrations in sediments and X-ray diffraction was used to determine carbonate-and clay-mineral percentages in analyzed samples.The carbonate minerals observed in this study are low-magnesian calcite and aragonite. The clay minerals observed in this study-smectite and illite were-identified by their characteristic basal X-ray diffraction maxima, i. e. “peaks” or “reflections.”Low-magnesium calcite and aragonite are common carbonate minerals in modern environments and reflect the choice of most skeletal organisms in tropical seas for their hard parts. The occurrence of both low-magnesium calcite and aragonite and the absence of high-magnesium calcite indicate a slight influx of fresh, vadose or vadose-phreatic water. The diagenetic removal of magnesium from high-magnesium calcite, thereby generating low-magnesium calcite, may explain the complete absence of high-magnesium calcite in the analyzed samples.The distribution of trace elements in the sediments, e.g., Co, Fe, Cu, and Pb is related to the carbonate mineralogy. This helps in the interpretation of the diagenetic history of the deposits, which have been studied from both mineralogical and geochemical perspectives and which suggest possible mechanisms for the various diagenetic changes. Trace-metal concentrations found at different sampling sites vary greatly from one site to another. The bottom sediments of Lake Mariute contain heavy metals in concentrations, which exceed United States Environmental Protection Agency criteria for contaminated lake water and sediments,Radioactive dating analysis shows that two of the eleven stations have a detectable component of cesium 137 particles, indicating that some of the sediment was deposited after 1950.
Starting Page	169
Ending Page	194
Page Count	26
File Format	PDF
ISSN	08912556
Journal	Carbonates and Evaporites
Volume Number	15
Issue Number	2
e-ISSN	18785212
Language	English
Publisher	Springer Netherlands
Publisher Date	2000-01-01
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Geology Mineral Resources Mineralogy
Content Type	Text
Resource Type	Article
Subject	Geochemistry and Petrology

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