Abstract
The concentrations of trace level organotin compounds (TBT and TPT) in 32 seawater samples were analyzed by TDS-GC-MS with the stir bar sorptive extraction method.
The concentration range of TBT was 0.02-0.83 ng/L and of TPT was 0.002 to 0.17 ng/L. The maximum concentration of TBT was 0.83 ng/L at port of Yokohama and for TPT was 0.17 ng/L at Ofunato bay.
The concentrations of both the organotin compounds at the basin sampling points were relatively higher than the points at open sea. And also, in all the sampling points the concentration of TPT is about one order lower than TBT.
However in the Sea of Japan, points of relatively higher concentration of TBT were found, such as Japan Basin(0.35 ng/L). From this analytical result it is suggested that the pollution of TBT at the Sea of Japan has progressed in a wide range.
In contrast it seems that the concentration of TPT in the open sea was almost constant with no high concentration points seen in the Sea of Japan.
