guidance of FOCUS degradation kinetics - pfmodels

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Conclusions (1) • 2 methods give different results, esp. for degradation rate in sediment • no clear guidance on what to select for FOCUS sws • entire procedure is laborious (2 models) and needs expert judgement • is fitting with TOXSWA only an acceptable option ?
Demonstration fitting with TOXSWA • New development, TOXSWA coupled to PEST • Use only TOXSWA instead of SFO model + TOXSWA • Fit in 2 steps: 1. K oc,sed =K oc,soil , optimise DegT50 for water and sediment 2. Optimise K oc,sed , both DegT50s simultaneously with range set for K oc,sed (e.g. ½-2 K oc,soil )
Page 1 and 2: Water-sed. studies for step 3 FOCUS
Page 3 and 4: Introduction • When are degradati
Page 5 and 6: Introduction
Page 7 and 8: Introduction • Degradation rates:
Page 9 and 10: Guidance FOCUS Degradation Kinetics
Page 15 and 16: Examples • Compound 4, K oc,soil
Page 17 and 18: Examples • Compound 3, K oc,soil
Page 19: Examples • Results level P-II and
Page 23 and 24: Fitting with TOXSWA • Disadvantag
Page 25 and 26: Fitting with TOXSWA • At present:
Page 27 and 28: Two runs to optimise
Page 29 and 30: Parameterise substance (ca 8 values
Page 31 and 32: Run PEST coupled to TOXSWA • Para

guidance of FOCUS degradation kinetics - pfmodels

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