Values in parentheses are based upon few data points (Fuller et al., 1966).
A correction has to be made to the sum in case of aromatic and heterocyclic rings are present.Ītomic and structural diffusion volume increments V B (m 3 mol -1 ) (Fuller et al., 1966).Ītom og andre strukturelle diffusions volume inkrementer V B (m 3 mol -1 ) (Fuller et al., 1966). Where ni is the number of atoms of kind i and VB,i is the volume increment cause by atom i. V B can be estimated from the chemical structure of the molecule using the increments listed in Table 1: The subscipts A and B in (B-1) refer to the air and the gaseous pesticide, respectively. K 1 = constant necessary to obtain the right dimensions. V = molar volume based on the method developed by Fuller et al. The FSG method is based on the following equation: Its accuracy is poorest for polar acids (12%) and glycols (12%) and minimal errors are found for aliphatics (4%) and aromatics (4%) (Lyman et al., 1982). It is most accurate for non-polar gases at low to moderate temperatures. The diffusivity of a gas in air can be estimated by the method of Fuller, Schettler and Giddings (FSG method) (Lyman et al., 1982). Viscosity and kinematic viscosity of (sea)water Viscosity of air and water and estimation of diffusivity of pesticides in air and water Diffusivity of gaseous pesticides in airĭynamic viscosity and kinematic viscosity of air | Front page | | Contents | | Previous | | Next |Īppendix B. Dry deposition and spray drift of pesticides to nearby water bodies
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