Abstract
Mex Bay is a semicircular basin under stress, receiving several polluted effluents from different sources. Umum Drain (UD) was the main contributor of dissolved lead (DPb) and, thus, its surface values decreased towards the offshore stations. Also, particulate lead (PPb) decreased towards the offshore stations. DPb and PPb values in the Misr Chemical Company (MCC) effluent were high, confirming its role in introducing, considerable amounts of lead into the bay, followed by the second contributor (UD), Dissolved cadmium (DCd) dominated the particulate form (PCd). Both decreased seaward, showing a decrease versus salinity. UD and MCC effluents beside inputs from atmosphere were responsible for introduction of great amounts of DCd into the bay. The MCC effluent introduces high amounts of PCd into the bay.