Volatile Aromatic Organic Compounds

1597 WordsSep 6, 20167 Pages
1. Introduction The release of volatile aromatic organic compounds into the environment is a serious problem as they distribute between the different phases in natural systems. Sediments can be considered as a sink for volatile aromatic organic compounds because of their hydrophobic nature and the resulting affinity to the sediment 's organic matter. Organic matter consists of soft carbon, where portioning is the main sorption process and hard carbon, where pore filling mechanisms dominate (Zhao et al., 2002; Chai et al., 2006). Consequently, sorption/desorption processes are the most important factors that determine the fate of volatile aromatic organic compounds in the environment. The extensive production and release of aromatic organic compounds has led to a widespread contamination of soils and sediments with these pollutants throughout the world, threatening drinking water resources, especially petroleum hydrocarbons as constituents of gasoline such as Benzene, 1,2 dichlorobenzene, Toluene and m-xylene. It was proposed that sorption of the sorbate molecules may cause deformation of flexible sorbent solids, such as natural organic matter and organo-clays resulting in an entrapment of sorbed molecules during desorption (Weber et al., 2002; Lu and Pignatello, 2004). Several researchers have tried to associate the maximum sorption capacities of organic compounds with the sorbed amounts in the slow and very slow desorbing domains (Van Heuvel et al., 2005; Van Heuvel and
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