esm222_03_properties

esm222_03_properties - ESM 222 Physicochemical Properties...

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1 © Arturo A. Keller ESM 222 Physicochemical Properties of Pollutants 2 © Arturo A. Keller Physicochemical Properties ] Molecular Weight ] Density ] Solubility ] Volatility (Vapor Pressure) ] Octanol-Water Partitioning ] Flammability & Flash Point ] Chemical Incompatibility
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3 © Arturo A. Keller Molecular Weight ] Mass of 1 mole of matter (6 x 10 23 molecules) ] Used mostly to convert from a balanced chemical equation to measurable mass ] Good correlation with other physical properties 4 © Arturo A. Keller Density ] Mass per unit volume (kg/m 3 ) ] Water ~ 1000 kg/m 3 ] Air ~ 1.2 kg/m 3 ] Note: same “units” as concentration and solubility, but the meaning is very different ! w a Water of Density Compound of Density Gravity Specific δ δ γ = = = 1000 kg/m 3 = 1.0 g/mL = 1.0 g/cm 3
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5 © Arturo A. Keller Density ] Density is an important factor to consider when modeling the movement of organic liquids (e.g. chlorinated solvents or hydrocarbon fuels) in water bodies (e.g. ocean spill, groundwater) 6 © Arturo A. Keller NAPLs ] Non-Aqueous Phase Liquids ] LNAPLs ] DNAPLs ] Single chemical or multi- component ] Behavior can change over time
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Source: Watts, 1998 Source: Watts, 1998
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NAPL storage tank Ground water flow direction Diffusing
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