有機スズ化合物

The environmental behavior and fake of tributyltin (TBT) in the northern Arialte Sea, resulting from the use of TBT-containing antifouling paints, was assessed by numerical simulations. First, incorporated with the non-steady state equilibrium, a mathematical model was constructed based on the multiple-compartment modeling consisting of the surface micro-layer, the water, the mud-layer and the boltom compartments. The movement of TBT among the four compartments was modeled in the form of the transport of adsorptive TBT by erosion of bottom mud and settling of suspended sediment, and the transport of dissolved TBT by film penetration and water advection. Onedimensional diffusion equation was introduced into the bottom compartment. Next, the appropriate amount of TBT input for realizing the recent rneasiirements of TBT concentration in the water and the sediments of the northern Ariakc Sea, was optimally searched by a simple genetic algorithm. The relative sensitivities of model parameters were also calculated in order to identify the relatively important parameters for estimating the environmental behavior and fate of TBT. Finally, the future of TBT contamination of tlie Arialte Sea was predicted under the simple scenario for slopping the use of TBT-containing antifouling paints. It was concluded that the multiple-compartment non-steady state equilibrium model worlced well for estimating the environmental behavior and fate of TBT and for predicting the future situation of TBT pollution in spite of its simple model structure.