The environmental fate of the polycyclic aromatic hydrocarbons (PAHs) is prompted by their ubiquitous distribution and their potentially deleterious effect on human health by their carcinogenic and mutagenic effects. PAHs are the most important components retained in the soil environment after an oil spill. Biodegradation of PAHs by microorganisms is the subject of many reviews, but every habitat had its own personality. Our study was selected by satellite images for Marduma Bay, located in the north-west of Jubal industry city, which lies on the coast of the Arabian Gulf of Saudi Arabia and is described as a heavy polluted region. Its polluted rate was identified between (8 to 10% w/w.) Chenopodium sp. is a naturally dominant plant that tolerates both salinity and pollution. Three soil samples were collected. The first one is the rhizosphere sample (R 4) in addition to two soil samples; one of polluted area (S5) & non-polluted one (S0). The rhizosphere sample showed the maximum bacterial count for both total heterotrophic bacteria, which was (98.2 to 94.2+0.1 CFUx106/g); and maximum count for oil degrading bacteria, which was (55.3 to 45.1+0.01 CFUx106/g). The concentrations of oil-degraders in different habitats were recorded on mineral media supplement with 2% crude oil as the only carbon source, thus recording a positive effect of the rhizosphere and phytoremediation process. As for the results of oil degrading microorganisms, soil samples of polluted regions (S5) and non- polluted soil (S0) indicated concentrations of (93.5 to 82.2+0,01 CFUx104/g) and (11.9 to 12.2+0.02 CFUx 104/g) respectively, and thus recording adaptation of this group of organisms in polluted habitat. The biodegradation of 16 PAHs individuals in both the rhizosphere (R4) sample of Chenopodiaceae and non-rhizosphere (S5) sample during 180 days was (77.4%) for the rhizosphere and (52.2%) for the non-rhizosphere. The residual of total carcinogenic PAHs with four rings structures recorded a loss between (55.7 to 75.4%) and (24.3 to 46.1%) for the five rig structure. Also, the residual of total carcinogenic PAHs was (49.1%) for the rhizoshpere and (31.7%) for the non-rhizosphere.


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