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(15-32) CEFIC LRI Persistence Project - Modelling Persistence. Riddle, Andrew*,1, 1 Brixham Environmental Laboratory, Brixham, England ABSTRACT- The CEFIC LRI Persistence Project is currently in the first phase of an experimental programme to develop environmentally realistic test methods for measuring biodegradation rates in the marine and terrestrial compartments. Six chemicals have been selected with a range of expected persistence values. Multi-media models from Trent University, Canada, have been used to make predictions of overall persistence and characteristic travel distance for these substances. Existing data from the literature have been used to obtain baseline predictions for each chemical. Comparison of overall half-life against single media half-lives shows that phenol, caffeine and pentachlorophenol behave as would be predicted by their single media half-lives, but the overall half-life values for naphthalene, benzo(a)pyrene and DDT indicate that partitioning and inter-compartment transfer are significant for these chemicals. Results from the initial phase of the experimental programme will be used in the multi-media models and compared with the baseline predictions. In addition a simple sensitivity analysis for the selected chemicals will be presented, and future work plans will be discussed. Key words: Persistence, Modelling, LRI programme |
