CHEMICAL STUDY ON SOME EGYPTIAN LAKES
Mohamed Alaa El-Deen Mahfouz Khalafalla;
Abstract
The natural environment is distinguished by strict balance between plant and animal, also between water and air. Man represents one of these elements that affect the environmental system and his influence may often lead to disorder in the balance, and that's for not regarding that influence on all components.
The main objectives of this study are to follow up the distribution
of some heavy and major metals between different ecosystem components ( sediment, pore water, water, aquatic plant, fish, shell ) in The four river Nile delta lakes namely Mariut, Edku, Burullus and Manzala. the sites of the last Egyptian use of the Nile water before flowing to the Mediterranean sea. Many samples from these components were collected, then analyzed for Fe, Mn, Mg, Zn, Pb, Cd, Ni, Co, Cu, using atomic absorption spectrophotometeric technique. The bioaccumulation factor ( BF ) was applied on the results of analysis. Water quality variables were monitored at surface and bottom water. Applying leaching sequential technique on sediment, using different extracting solutions, Mn and Pb exhibited good ability to be adsorbed or co-precipitated with amorphous iron-manganese oxides. It appears that, Fe, Ni, Cu and Zn are highly distributed in organic form. while Co and Mg are density presented in highly resistant lattice. Available cadmium concentrations are the dominant form. Overall the total trace metal concentrations were higher than natural back ground levels except for Fe, hence reflect the dangerous status of the northern delta lakes. Chemical partitioning patterns of metal show decrease in concentrations of
measured metals in sediment ( in exchangeable fraction ), that reflects the decrease of pore water contents, wherefore the water body is characterized by low metal concentrations. The alkaline pH-values of lakes water minimize the flux of metal ions from sediment and increase of metals sedimentation rate. Analysis of Tilapia nilvtica reflect high concentrations of Fe, Co, Ni, Zn and Pb in stomach. while Mn exhibited highest concentration in intestin of nilotica. Also, Cd recorded highest concentration in ni/otica muscle. Liver of ni/otica contains high Cu and Mg concentrations. The aquatic plant in the lake recorded elevated concentrations of Mn, Fe and Cu compared with all other measured metals. Based on the obtained data, the distribution of heavy metals and bioaccumulation factors in aquatic plants and Ti/apia indicated that the concentrations of these metals are derived from water.
The main objectives of this study are to follow up the distribution
of some heavy and major metals between different ecosystem components ( sediment, pore water, water, aquatic plant, fish, shell ) in The four river Nile delta lakes namely Mariut, Edku, Burullus and Manzala. the sites of the last Egyptian use of the Nile water before flowing to the Mediterranean sea. Many samples from these components were collected, then analyzed for Fe, Mn, Mg, Zn, Pb, Cd, Ni, Co, Cu, using atomic absorption spectrophotometeric technique. The bioaccumulation factor ( BF ) was applied on the results of analysis. Water quality variables were monitored at surface and bottom water. Applying leaching sequential technique on sediment, using different extracting solutions, Mn and Pb exhibited good ability to be adsorbed or co-precipitated with amorphous iron-manganese oxides. It appears that, Fe, Ni, Cu and Zn are highly distributed in organic form. while Co and Mg are density presented in highly resistant lattice. Available cadmium concentrations are the dominant form. Overall the total trace metal concentrations were higher than natural back ground levels except for Fe, hence reflect the dangerous status of the northern delta lakes. Chemical partitioning patterns of metal show decrease in concentrations of
measured metals in sediment ( in exchangeable fraction ), that reflects the decrease of pore water contents, wherefore the water body is characterized by low metal concentrations. The alkaline pH-values of lakes water minimize the flux of metal ions from sediment and increase of metals sedimentation rate. Analysis of Tilapia nilvtica reflect high concentrations of Fe, Co, Ni, Zn and Pb in stomach. while Mn exhibited highest concentration in intestin of nilotica. Also, Cd recorded highest concentration in ni/otica muscle. Liver of ni/otica contains high Cu and Mg concentrations. The aquatic plant in the lake recorded elevated concentrations of Mn, Fe and Cu compared with all other measured metals. Based on the obtained data, the distribution of heavy metals and bioaccumulation factors in aquatic plants and Ti/apia indicated that the concentrations of these metals are derived from water.
Other data
| Title | CHEMICAL STUDY ON SOME EGYPTIAN LAKES | Other Titles | دراسة كيميائية على بعض البحيرات المصرية | Authors | Mohamed Alaa El-Deen Mahfouz Khalafalla | Keywords | .Aqueous ecosystem, bioavailability, metal speciation, internal metal distribution, bioaccumulation factors, the northern Delta lakes, Egypt | Issue Date | 2006 |
Recommend this item
Similar Items from Core Recommender Database
Items in Ain Shams Scholar are protected by copyright, with all rights reserved, unless otherwise indicated.