Role of polyaromatic hydrocarbons in the pollution of aquatic ecosystems

Polyaromatic hydrocarbons (PAH) are one of the most common pollutants entering surface water with effluent from oil refineries, shale refineries, wood chemical, coking, aniline dye industries, as a result of timber rafting, as well as from hydrolysis industry drains. During petroleum refining, catalytic and thermal cracking process produces polluted PAH waters, which are very dangerous for the environment. For the analysis of such waters, 3 samples were taken from the points of the Oil Refiner after preliminary and using analytical methods, we investigated the PAH  and heavy metals in polluted waters. For samples 1 the PAH concentration was high, and for samples 2 and 3  the PAH concentration was relatively low. This is due to the fact that water samples taken from source 1 are closer to the site where the catalytic cracking process takes place; therefore, the PAH concentration is higher than in sites with samples 2 and 3. Qualitative analysis was performed on an HP6890 GC instrument with an HP5975 mass selective detector, GC-MS (Agilent, , USA) equipped with a ZB-5 column (Phenomenex, USA).