Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
8872169 | Marine Pollution Bulletin | 2017 | 16 Pages |
Abstract
The distribution and sources of PAHs and n-alkanes were determined in the surface sediments from 202 locations in Shadegan international wetland with 537,700 ha. The concentrations of total n-alkanes and PAHs ranged from 395.3 to 14933.46 μg gâ 1 dw and 593.74 to 53393.86 ng gâ 1 dw, respectively. Compared with other worldwide surveys, the concentration and contamination of sedimentary hydrocarbons were classified very high. A common petrogenic hydrocarbon source was strongly suggested in all sites by n-alkanes' profile with a Cmax at n-C20, Pr/Ph and CPI ratios < 1 in all sites, and high percentage of UCM. Typical profile of petrogenic PAHs with alkyl-substituted naphthalenes and phenanthrenes predominance, various PAH ratios and multivariate analysis indicated that PAHs were mainly derived from petrogenic source. Naphthalene-derived compounds in all sites were significantly above their ERL, and adversely affected benthic biota. 92% of the sites had mean ERM values < 0.1, indicating high ecological risk on the wildlife of the wetland.
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Authors
Akram Bemanikharanagh, Alireza Riyahi Bakhtiari, Jahangard Mohammadi, Ruhollah Taghizadeh-Mehrjardi,