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Abstract
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UCM or uncoupled complex compounds, including branched and alkaline alkanes that are more stable than normal alkanes against microbial degradation, and thus remain more stable than normal alkanes in the environment. Since the compounds form the UCM. In chromatograms obtained from the analysis of alkanes, generally derived from the use of fossil fuels, a proportion of the concentration of UCM to the concentration. Normal alkanes can be used to assess the level of oil pollution in the area studied. Today, Shadegan Lagoon faces many environmental pollution problems, especially oil and metals pollution. In this research, the amount of decomposition and weathering of oil pollutants in the Shadegan wetland region has been analyzed by analyzing annular and branched alkanes that show greater resistance to normal alkanes than microbial decomposition and thereby more likely to remain stable in the environment. To be examined. In order to determine the concentration of PAH compounds and normal alkanos, surface sediment samples at depths of 0-5 cm from the wetland bed at 202 points were analyzed by systematic random sampling method. The analysis of normal alkanes and PAHs was done by gas chromatography with mass spectrometry (GC-MS). The results showed that 90% of the study area is affected by oil pollution and is subject to chronic contamination. The chromatograms from the Shadegan wetland sediment analyzes show UCM mainly in the carbon-n-C16-n-C32 carbon band. The presence of U / R (abbreviation) greater than 2 in 84% of the samples indicates the dominant petrogeneic origin of the old age
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