Sedimentary Record of Polycyclic Aromatic Hydrocarbons in the Gulf of Trieste (Northern Adriatic Sea) - Distribution, Origin and Temporal Trends

A mid-term study (2003-2013) of polycyclic aromatic hydrocarbons in Gulf Trieste sediments was conducted at seven sampling sites. The PAH spatial and temporal distribution origin were determined. sampled with a gravity core sampler. After extraction PAH, their concentrations determined by gas chromatography. results the show variability. highest mean concentration measured marina Portoroz (1168 ng/g dw), lowest an offshore site (320 dw). higher coastal areas decreasing trend towards central part Trieste. interannual differences showed significant downward Portorož, port Koper off Piran. No observed all other Various evaluation indices that are predominantly pyrolytic origin, lower proportion petrogenic especially Bay Koper. ecological risk assessment found well below levels associated adverse biological effects. According to presented results, this area can be considered as only moderately contaminated PAH. However, applied measures reduce pollution should continued intensified.