Vertical distribution of organic matter (TOC, LOI) and PAHs in marine sediments

This study provides data on the loss on ignition (LOI) and total organic ca rbon (TOC), reflecting the organic matter conten and polycyclic aromatic hy drocarbons (PAHs) present in the marine inter-tidal sediments at Sa < ntand er Bay, Northern Spain. The area under study is an estuary of high ecologic al value with a relevant socio-economic influence over the region due to th e presence of harbour, industrial and tourist activities. Analyes of LOI, T OC and 16 PAHs were performed in 50 cm vertical samples of sediments from t wo zones that represent urban/industrial area (station 4) and a rural area (station 9). Relationships between the concentration values of global param eters LOI, TOC and PAHs in each centimeter of sediment have been obtained. The results lead to a better knowledge of the vertical profile concentratio ns, which can be applied to environmental impact assessment and the managem ent of sediments in potential dredged actions.