The importance of the Persian Gulf and its role in economy and dynamic of the region and the
development of industrial activities, refineries and residential activities in its surrounding area
highlights environmental monitoring of this zone as a fundamental concern for researcher and policy makers. For this purpose, in 2012-2013, surface sediment of 58 stations in the Persian Gulf were sampled as transect from coastal line to offshore. All samples were transferred to the laboratory according to the standard procedure for heavy metal analysis. Total concentration of Cu, As, Cr, Cd, Pb, Zn, Ni, and Hg were measured by acid digestion and analyzed by ICP-MS. The grain size analyzed by Scatter analyzer and Carbonate measured using Lol Method. The results showed that general texture of the sediment was Silt-Loam and Carbonate content varied 8.5-53.72. According to the single Ecological Risk (ER), Cd, Hg, As and Ni had moderate risk. Average of ecological risk index (RI) pointed 335 which showed high risk in the studied region. Although, this index was higher in the Hormozgan province. Both provinces of Bushehr and Hormozgan were classified in the high risk class. General framework of the generated map for RI showed that RI indices decreased with increasing the distance from coastal line. This result indicated the obvious role of discharging environmental pollutant from terrestrial pollution source to the Persian Gulf.

Background and Theoretical Foundations: The environmental issues resulting from the commercial activities of the ports and their support in backshore are often reflected in the coastal-marine environment area. because any type of pollution with a known or unknown origin can eventually affect the marine environment as well.
Methodology: In this study, considering the importance of Shahid Bahonar port and a extensive of loading, discharging and shipping activities of this port, Sampling of sediments was done in 11 stations in the basin and sea area of ​​this port in 1400 and 1401 and the concentration of heavy metals and aromatic petroleum hydrocarbon  was measured. .
Findings: Average concentration of heavy metals in sediments for arsenic (3.40), cadmium (1.20), chromium (177.29), iron (22261.40), copper (61.64), zinc (116.35), manganese (333/79), mercury (0.23), cobalt (26.29) and nickel (90.96) mg/kg were measured.  Also, about petroleum hydrocarbons, the results showed that among the 16 aromatic compounds studied, the highest concentration of Fluoranthene with 507.6 ng/g was measured at station 2 and the lowest concentration of Naphthalene was measured with 1.4 ng/g. According to the ecological risk assessment, the highest level of pollution is in the stations in the basin of the port and oil jetty with a medium degree of pollution, and the stations inside basin have a higher cumulative risk than outside the port.
Conclusion:  According to the obtained results, it can be said that port activities, marine repair activities of neighboring industries, the closure of the port basin and the low ratio of water exchange in the basin are factors that cause the accumulation of heavy metals and petroleum hydrocarbons in the sediments.