Aliphatic hydrocarbons in urban runoff sediments: a case study from the megacity of Tehran, Iran

Gas chromatography‐mass spectrometry in assessment of road run‐off sediment quality parameters

“…The total amount of extracted organic substance ranged from 1185 – 3050 μg/kg, with sample A having the highest concentration of 3050 μg/kg for soluble organic substance and 62.0156 μg/kg for saturated hydrocarbons. On the other hand, sample D is characterized by the highest concentration of aromatic compounds, 285.0012 μg/kg, which could be an indication of the presence of an oil pollutant, since the sampling location is in the immediate vicinity not only of the road but also of the newly built residential complex, as well as the industrial zone [34].…”

“…The second part of bimodal distribution with C29; C31 predominant homologs correspond to a native hydrocarbon source, while the first part with C15; C16 maxima corresponds to anthropogenic sources [27, 37, 38]. One of the reasons for the dominance of higher homologs of n ‐alkanes in sample B is the possible influence of the nearby heating plant, which uses a heavy oil fraction, mazut, mixed with diesel fuel as a heating agent, while in the case of sample D, it is the possible effect of leaching of organic matter from busy roads [31, 34]. The sharp decrease in the n ‐alkane distribution in sample C is a consequence of additional dilution by the confluence of the Vrbanja River directly near the sampling site.…”

“…F I G U R E 2 Chromatograms of n-alkanes (m/z 71) of samples A, B, C, and D fuel as a heating agent, while in the case of sample D, it is the possible effect of leaching of organic matter from busy roads [31,34]. The sharp decrease in the n-alkane distribution in sample C is a consequence of additional dilution by the confluence of the Vrbanja River directly near the sampling site.…”

“…Masood and colleagues conducted a similar study using cluster analysis based on the presence of different aromatic and aliphatic hydrocarbons to assess the source and origin of hydrocarbons in samples of Kuala Selangor River, Malaysia [33]. Moghaddam and co‐workers examined the spatial distribution and origin of C11–C35 n ‐alkanes, as well as n ‐C17/pristane and n ‐C18/phytane ratios, in sediment samples from the city of Tehran, Iran [34]. Recently, another team conducted a study of the composition of PAH in the Subei Shoal area in China.…”

Source identification, Accumulation and Dispersion of Heavy Metals pollution into the Surface Sediments of Urban Runoff (Case Study, Channels of Tehran City

“…In the same case study, hydrocarbons contamination and total organic carbon of soil in the agriculture lands of southern Tehran, in resulting contaminated water irrigation, urban runoff, and or oil leakage from the reservoirs of the Tehran re nery in the lands south of Tehran was investigated by Hashemi and their colleagues that anthropogenic activities contributors in the region were higher [70,71]. As well as other similar researches, has been conducted on PAHs and aliphatic compounds in urban runoff of Tehran city [72,73]. Other study assigned that reservoirs leakage and over owing of reservoirs during refueling as result petrol stations is lead to further hydrocarbons oils in the surface urban runoff of Tehran city that go through channels and towards rivers and agricultural lands south of city which is responsible for contamination in the down region [74].…”