An investigation of aqueous activity coefficients at low concentrations |
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Authors: | AJ Dobbs LJ Tavener |
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Institution: | Building Research Establishment, Princes Risborough Laboratory Princes Risborough, Aylesbury, Buckinghamshire HP17 9PX, United Kingdom |
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Abstract: | The activity of a chemical in solution determines its tendency to move into other media. At low concentrations (<0.01M) it is generally considered to be linearly related to concentration. A hypothetical model based on the structure of liquid water is discussed which could cause deviations from this linearity in the ppb region, a concentration much lower than that normally investigated thermodynamically, but one of great importance environmentally. Headspace experiments are reported with carbon tetrachloride and chloroform in water at concentrations down to ~10?3 ppb but no such deviations were discerned. |
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