Early Monitoring of Potentially Toxic Hydrocarbon Species in Sediment and Biological Samples from Southern Guimaras, Philippines After Oil spill

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  • フィリピン重油流出後の南ギマラス地域における底質および生物中石油成分の初期調査

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Sediment samples collected from Taklong Island one month after the oil spill incident in Southern Guimaras, Philippines were found to contain very high level of the potentially toxic hydrocarbon species, the polycyclic aromatic hydrocarbons (PAHs) and their alkylated homologues (alk-PAHs). The potentially toxic PAHs present in sediment samples were acenaphthene, acenaphthylene, anthracene, benz(a)anthracene, benzo(a)pyrene, benzo(e)pyrene, benzo(b)fluoranthene, benzo(k)fluoranthene, benzo(g,h,i)perylene, chrysene, dibenz(a,h)anthracene, fluoranthene, fluorene, indeno(l,2,3-c,d)pyrene, naphthalene, phenanthrene, and pyrene. Among the 17 PAHs in the priority list of potential hazardous compounds, 7 of these PAHs are considered as potential human carcinogens, namely benzo(a)pyrene, benz(a)anthracene, chrysene, benzo(b)fluoranthene, benzo(k)fluoranthene, dibenzo(a,h)anthracene, indeno (1,2,3-c,d) pyrene. Seventeen different alk-PAHs found in high level in the sediment samples were 1-methylnaphthalene, 2-methylnaphthalene, 1,2-dimethylnaphthalene, 2,3,5-trimethylnaphthalene, 1-methylfluorene, 4-methyldibenzothiophene, 4,6-dimethyldibenzothiophene, 1-methylanthracene, 1-methylphenanthrene, 2-methylphenanthrene, 2,3-dimethyanthracene, 2-methylfluoranthene, 1-methylpyrene, 1-methylbenz(a)anthracene, 4-methylchrysene, 7,12-dimethylbenz(a)anthracene, and 7-methylbenzo(a)pyrene. Oyster, squid and fish samples collected and analyzed were found to contain relatively low level of PAHs and some alk-PAH compounds. There are 9 PAH compounds detected in the biological samples namely; naphthalene, acenaphthylene, fluorene, dibenzothiophene, phenanthrene, fluoranthene, pyrene, benz(a)anthracene and chrysene and 6 alk-PAHs; 1-methylnaphthalene, 2-methylnaphthalene, 1,2-dimethylnaphthalene, 4-methyldibenzothiophene, 4,6-dimethyldibenzothiophene, and 1-methylphenanthrene.

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