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This work aims to the assessment of marine pollution in the Bay of Oran, including zinc, copper, iron and lead. These toxic elements represent a real danger to living organisms. Many factors have increased the marine pollution and marine traffic including the transport of hydrocarbons, industrial and domestic discharges and fishing activities, etc. This study shows essentially the bioconcentration of heavy metals in the species Mytilus galloprovincialis, these filter bivalves have a broad geographical distribution in our study area, so they allow us to better estimate the degree of pollution at the Bay of Oran. The study of changes in metal concentrations has marked some important points for, the four metallic elements are present in the flesh of mussels analyzed at the port of Oran. This study is part of assessment of pollution at the coast of western Algeria to protect the marine environment.

Faujasite nanoparticles with average size of 10-40 nm were obtained without any organic structure directing agents (Green synthesis), then used as precursors for the synthesis of NaY/ SBA-15 composites. Two types of composites were obtained with meso/micro porosity (C1 and C2).The inorganic salt, NH 4 F, has a crucial effect on their morphologies, therefore, their textural and catalytic properties have been mostly influenced. The resulting materials were characterized by X-ray Diffraction (XRD), N 2 sorption, Scanning Electron Microscopy (SEM) .The both composites have been successfully used as catalysts for the N-formylation reaction of aniline. As a result, N-phenylformamide was obtained with up to 90 % yield and 100 % selectivity at 50°C in 4 h (solvent-free conditions) .The catalytic tests were monitored by gas chromatography (GC) and the nature of the products was confirmed by NMR.