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4E - Food Safety (TH9/4) Plant specific exposure assessment of chemicals in soil and environment. Trapp, Stefan 1, Samsøe-Petersen, Lise 2, Rasmussen, Dorte2, 1 Environment & Resources DTU, Lyngby, EU, Denmark2 DHI Water & Environment, Hørsholm, EU, Denmark ABSTRACT- In many countries worldwide, soil protection laws have been passed in the last years, and assessment tools for exposure to and risk from soil pollution have been developed. To mention are the Contaminated Land Exposure Assessment Model CLEA (UK), the UMS (Germany), CSOIL (NL) and the Soil Screening Guidance (US). All these tools include the one or the other plant uptake estimation method, but make no difference between plant species. A new family of plant-specific chemical uptake models was developed and tested, including the carrot model (advection into roots), the potato model (diffusion into tubers or roots), the apple model (advection into fruits), and the salad model (which is the updated TGD model). All models are based on similar assumptions (chemical partitioning, 1st order degradation and growth, constant fluxes and diffusion), but consider different processes for different plant products, and have plant-specific default parameterizations. Calculations were made for a couple of typical soil pollutants. The sum of uptake, calculated plant specifically with these models and weighted with the average daily diet of the vegetables and fruits, is comparable to the result given by the empiric regression of Travis & Arms, which is used in the US. But there are clear and important differences between the uptake of chemicals into different plants, and conclusions for risk assessment may be quite contrary. It may make a difference, whether potatoes or apples are grown in a contaminated garden. Key words: Risk assessment, Food safety, Apples, Potatoes |
