Handbook of physical-chemical properties and environmental by Donald Mackay; et al

By Donald Mackay; et al

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Extra info for Handbook of physical-chemical properties and environmental fate for organic chemicals. 4

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9. From the four fugacities, the concentration, amounts and rates of all transport and transformation processes can be deduced, yielding a complete mass balance. , the extent to which chemical discharged into one medium tends to migrate into another. This migration pattern depends strongly on the proportions of the chemical discharged into each medium; indeed, the relative amounts in each medium are largely a reflection of the locations of discharge. It is difficult to interpret these mass balance diagrams because, for example, chemical depositing from air to water may have been discharged to air, or to soil from which it evaporated, or even to water from which it is cycling to and from air.

Level III The Level III calculation includes an estimation of intermedia transport. 8) suggests that air-water and air-soil transport are most important with water-sediment and soil-water transport being negligible in potential transfer rate. 7 Level II fugacity calculations for benzene in a generic environment. transport D values (approximately 106 mol/Pa·h) compared to the atmospheric reaction and advection values of 108 to 109 suggests that reaction and advection will be very fast relative to transport.

The “Half-life in the Environment” and “Environmental Fate Rate Constants” are medium-specific degradation reaction half-lives selected for use in Level II and Level III calculations. As discussed earlier, emphasis was based on the fastest and the most plausible degradation process for each of the environmental compartments considered. In summary, the physical-chemical and environmental fate data listed result in the tabulated selected values of solubility, vapor pressure, KOW, dissociation constant where appropriate and reaction half-lives at the end of each chapter.

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