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Correlation between the heavy metal levels in SPM and some parameters of the waters of iskenderun bay
Abstract
In this study carried out from August 2001 to July 2002 in Iskenderun Bay was investigated relationships between the water temperature, pH, salinity and oxygen and, the heavy metal concentrations (Cd, Fe, Cu, Pb, Zn, Co, Cr, Al, Mn, Ni) in the suspended particulate material (SPM) in the waters of the bay. Significant effect (negative and positive correlation) were observed between the heavy metal concentrations in the SPM and, temperature, salinity, pH and oxygen concentrations (p<0.05,p<0,01).
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Etude en laboratoire, pour des temperatures de 5, 10 et 15°C et des salinites de 5 a 40‰, a des intervales de temps allant jusqu'a 384 h. La toxicite croit lorsque la temperature croit et lorsque la salinite decroit. Necessite donc de tenir compte des facteurs de milieu lors d'etudes toxicologiques du chrome en milieu d'estuaire
The concentrations of Cd, Cu, Co, Fe, Zn, Mn, Pb and Ni were determined in water, suspended solids and surficial sediments of the River Tigris at the Samarra impoundment during high (April) and low (July) river discharge months in 1988. The recorded concentrations in water were either significantly lower or within the Iraqi river water standards and the average clean river water of the world. Variations in the concentrations of heavy metals in suspended solids were interpreted to be due to local differences in current velocity and distance from the shore line (from sewage source of the residential sector). The concentrations of most of the examined elements in the surficial sediments (except for Mn and Fe during April) were lower than those in the suspended solids. Results stress the importance of the suspended solids in transportation of heavy metals in the River Tigris. Higher concentrations of Co, Mn and Fe are discussed in relation to sedimentation process and the nature of the river basin.
Selective chemical attack has been used to separate recent surface marine sediments into organic, non-detrital and detrital components, and the concentrations of iron, manganese, copper and zinc in each fraction determined. The non-detrital fraction controlled the overall elemental concentrations and relationships apparent in the bulk sediment, particularly in the cases of copper, manganese and zinc. Copper was found associated with the organic fraction. The predominant processes of primary deposition are precipitation of hydrated ferric oxide and adsorption of copper and zinc onto this material.