Chemical fingerprinting applied to the evaluation of marine oil pollution in the coasts of Canary Islands (Spain)

Chemical fingerprinting approach to environmental assessment is illustrated in the evaluation of marine oil pollution in the coasts using two limpet s pecies as bioindicator organisms, and based on profiles and concentrations of n-alkanes and aromatic hydrocarbons in their tissues. Accidental and chr onic releases of hydrocarbons can contaminate the marine environment of the Canary Islands not only because of their geographical situation but also b ecause of the very dense tanker traffic around. This situation affects coas tal areas, fishing activities, tourism resort, etc. Concentrations of n-alk anes and aromatic hydrocarbons (polycyclic aromatic hydrocarbons and methyl -polycyclic aromatic hydrocarbons) in the soft tissues of the marine intert idal and subtidal limpets, Patella crenata and Patella ullysiponensis asper a, were evaluated. Limpet samples were collected at monthly intervals, at t hree locations on the southeast coast of Tenerife over a 3-year period (199 1-93). Levels of hydrocarbons found in limpets are similar to concentration s found in unpolluted areas around the world. From application of principal component analysis, the interpretation of variable loading plots gives inf ormation on variable correlation and can be used to distinguish among poten tial sources of pollution and the ability of studied molluscs to be used as bioindicator organisms. (C) 2000 Elsevier Science Ltd. All rights reserved .