By Donald Mackay; et al
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Extra resources for Handbook of physical-chemical properties and environmental fate for organic chemicals. 4
The reaction and advection D values employ the generally smaller bulk phase Z values but the same residence times; thus the G values are increased and the D values are generally larger. Intermedia D Values The justification for each intermedia D value follows. It is noteworthy that, for example, air-to-water and water-to-air values differ because of the presence of one-way non-diffusive processes. A fuller description of the background to these calculations is given by Mackay (2001). 1. Air to Water (D12) Four processes are considered: diffusion (absorption), dissolution in rain of gaseous chemical, and wet and dry deposition of particle-associated chemical.
The “Environmental Fate Rate Constants” refer to specific degradation processes rather than media. As far as possible the original numerical quantities are given and thus there is a variety of time units with some expressions being rate constants and others half-lives. 693/t½ where t½ is the half-life. From these data a set of medium-specific degradation reaction half-lives is selected for use in Levels II and III calculations. Emphasis is placed on the fastest and the most plausible degradation process for each of the environmental compartments considered.
For aqueous solubilities, valuable sources include the IUPAC Solubility Data Series (Barton 1984, Horvath and Getzen 1985, Shaw 1989a,b) and Horvath’s Halogenated Hydrocarbons, Solubility-Miscibility with Water (Horvath 1982). Octanol-water partition coefficients are conveniently obtained from the compilation by Leo et al. (1971), Hansch and Leo (1979), Hansch et al. (1995), and Sangster (1989, 1993), or can be calculated from molecular structure by the methods of Hansch and Leo (1979) or Rekker (1977).
Handbook of physical-chemical properties and environmental fate for organic chemicals. 4 by Donald Mackay; et al