抄録
Many of the present antifouling agents developed since the ban of organotin compounds have an environmental advantage owing to their high photodegardation rate. However, increased use of these compounds may result in relatively high concentrations of them in the aquatic environment. In addition, their concentration may be changed drastically with solar radiation intensity. Therefore, it is necessary to investigate the effect of solar radiation and other factors that influence the concentration. A numerical model has been developed to predict spatial, seasonal and temporal changes in the concentration of certain photodegradable antifouling agents in a small marina. The model deals with three dimensional unsteady-state water flow and the photodegradation process influenced by various environmental factors. The results showed that the concentration is very sensitive to environmental conditions, which is changed with, season, weather and geographic location. The temporal and spatial concentration distribution makes it difficult to determine meaningful predicted environmental concentration (PEC) for an environmental risk assessment. It also suggests significant uncertainty in environmental samples.
