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Program Modifications & New Features in v3.20:

  1. A new model has been added to the Biowin system of biodegradability prediction models. It is Biowin7, which estimates anaerobic biodegradation potential
    • The model predicts fast/slow degradation in the “serum bottle” test, OECD 311
    • The test conditions are most relevant to anaerobic digesters. Anaerobic digestion is a treatment phase in almost every POTW
    • The model uses a BIOWIN fragment contribution approach
  2. A new biodegradability model for hydrocarbons has been added: BioHCWin
    • BioHCWin estimates biodegradation half-life for compounds containing only carbon and hydrogen
    • The model uses a fragment contribution approach
    • Support for BioHCWin development was provided by CONCAWE
  3. Subcooled liquid vapor pressure prediction has been added to MPBPVP. Subcooled liquid VP is the vapor pressure a solid would have if it were liquid at ambient temperature. It is the most relevant vapor pressure value for solids in environmental partitioning (e.g. in multimedia models), and is needed to estimate aerosol-particulate partitioning using the Junge-Pankow method
  4. The Henrywin program now calculates the dimensionless Henry constant or KAW, also known as the air/water partition coefficient
    • The KAW value is displayed in the Koawin program output
    • Needed to estimate octanol/air partition coefficient (KOA)
    • Other uses in prediction:
      • Volatilization from water
      • Plant uptake: water fraction of foliage
      • Rain and snow scavenging
  5. A new program called Koawin has beeen added. The program estimates the octanol/air partition coefficient or KOA, using the ratio of the octanol/water partition coefficient (KOW) from Kowwin, and KAW from Henrywin
      • Uses in prediction:
      • Soil-air partitioning Vegetation-air partitioning
      • Air-aerosol (particulate) partitioning
      • Various models use KOA to predict long-range transport potential (LRTP)
      • Support for Koawin development was provided by CONCAWE
  6. A new program called Aerowin has been added. It estimates the fraction of airborne substance sorbed to airborne particulates, i.e. the parameter phi(φ)
    • Distribution of an airborne chemical between the particulate and gas phases is a key factor controlling photooxidation and deposition
    • Fraction of chemical in the particulate phase (φ) is highly dependent on VP
    • Reactivity of particle-bound chemicals is poorly understood, but it is generally assumed that bound chemical is unreactive. This information is now displayed in the Aopwin output as well as in its own (Aerowin) section
    • Three methods are most widely used: Junge-Pankow, Mackay, KOA (Harner). Junge-Pankow is the most familiar; but KOA is thought to have a superior theoretical basis

EPI Suite™can be downloaded and installed using Download EPI 3.20


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