Distribution of antifouling biocides and organophosphorous compounds were surveyed in aquatic areas from Suruga Bay to the Japan trench, Japan. Tributyltin (TBT), dibutyltin (DBT) and monobutyltin (MBT) compounds in surface water were detected in the range of 5-6 ng/L, 2-3 ng/L and 34-104 ng/L, respectively. Although the concentrations of phenyltin (PTs) compounds were lower in comparison with TBT, Triphenyltin (TPT) compounds were the dominant species among phenyltins. Higher concentrations of Sea Nine 211 and Dichlofluanid were observed among alternative compounds. Among organophosphorous compounds, Triethyl phosphate (TEP), Tributyl phosphate (TBP), Tris (2-chloroethyl) phosphate (TCEP), Tris (2-butoxyethyl) phosphate (TBXP), Triphenyl phosphate (TPP), Tricresyl phosphate (TCP) and Fenitrothion were detected in surface water. In general, the concentrations of antifouling biocides and organophosphorous compounds in water column (water depth; 2000m) were distributed uniformly between upper and bottom layer, while the concentrations of Sea Nine 211, Diuron and TEP were high in the surface water and decrease towards the bottom layer, suggesting the inputs of these compounds from surface water have continued.
