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In order to identify the levels of contamination by polycyclic aromatic hydrocarbons (PAH), their concentration was determined by gas chromatography coupled to mass spectrometry in the fraction of aromatic hydrocarbons obtained from soluble organic matter (SOM), extracted from mangrove soils. Soils are located in Cuare Inlet and Morrocoy National Park from Venezuela, and samples are were collected in Punta La Matica (PLM) and Tucacas Bay (ETU) respectively. Naphthalene, acenaphthene, acenaphthalene, benzo(ghi)perylene, dibenzo(ah)anthracene and indene have concentration lower than the detection threshold for the technique employed (£ 20 ng/g). Fluorene, phenanthrene, anthracene, fluoranthene, pyrene, benzo(a)anthracene, chrysene, benzo(k)fluoranthene, benzo(b)fluoranthene and benzo(a)pyrene present concentration range from 24 to 967 ng/g, and in some cases are not detected (£ 20 ng/g). The PAHs concentration are classified in a pollution levels from moderate to high in ETU and low in PLM. These results indicate major anthropogenic level to soils from ETU relate to PLM soils. Based on the fact that the PAHs detected are not substituted and dominate the 3- and 4-rings, three diagnostic radios to identified contamination source were calculated: [anthracene/(anthracene+phenanthrene), fluoranthene/(fluoranthene+pyrene); and benzo(a)anthracene/(benzo(a)anthracene+chrysene)]; these ratios suggest a source from combustion of organic matter. Additionally, the normalization of total PAHs relate to TOC or SOM represents linear relationship between total PAHs with PAH/TOC and PAH/SOM, and suggest that the PAHs detected come from the same source. The PAHs source comes from of combustion of organic matter from anthropogenic activity, industrial activity or natural fires.

ANALYSIS OF POLYCYCLIC AROMATIC HYDROCARBONS (PAH) IN SOIL OF MANGROVE FOREST OF THE VENEZUELAN CARIBBEAN COAST