Article ID Journal Published Year Pages File Type
5757747 Marine Pollution Bulletin 2017 7 Pages PDF
Abstract
Polycyclic aromatic hydrocarbons (PAHs) showed significant seasonal dynamics in surface sediments of a tropical ecosystem (Cochin estuary, south west coast of India). Concentrations ranged from 304 to 5874 ngg− 1 in pre-monsoon, 493 to 14,149 ngg− 1 in monsoon, and 194 to 10,691 ngg− 1 in post-monsoon. The estuary was moderately contaminated with low molecular weight PAH fractions, which increased rapidly during the monsoon season indicating land/river runoff as the major transport pathway. The dominance of 2-3 ring fractions in the PAH indicated petrogenic and low temperature combustion processes as major sources, while the very low levels of 5-6 ring components indicated low contribution from pyrolytic sources. Low molecular weight fractions were higher in concentration than the Effective Range-Median (ERM) levels, whereas high molecular weight PAHs were lower than the Effective Range-Low values (ERL). Calculated carcinogenic toxicity equivalents (TEQ) values ranged from 1 to 971 ng g− 1 in the surface sediments.
Related Topics
Physical Sciences and Engineering Earth and Planetary Sciences Oceanography
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