Preferred Label : partition ratio;
Detailed label : partition ratio, KD;
IUPAC definition : The ratio of the concentration of a substance in a single definite form, A, in the
extract to its concentration in the same form in the other phase at equilibrium, e.g.
for an aqueous/organic system: \[\left (K_{{D}} \right )_{A} \frac{\left [ A \right
]_{{org}}}{\left [ A \right ]_{{aq}}}\];
Scope note : if the pure solvent and infinitely dilute feed are taken as the standard states,
kd kd as the total concentration of dissolved materials decreases.; the use of the inverse ratio (aqueous/organic) may be appropriate in certain cases,
e.g. where the organic phase forms the feed but its use in such cases should be clearly
specified. the ratio of the concentration in the denser phase to the less dense phase
is not recommended as it can be ambiguous.; kdis sometimes called the distribution constant; this is a good synonym. the terms
distribution coefficient, distribution ratio,partition constant and extraction constant
should not be used as synonyms for partition ratio.;
Origin ID : P04440;
See also
The ratio of the concentration of a substance in a single definite form, A, in the
extract to its concentration in the same form in the other phase at equilibrium, e.g.
for an aqueous/organic system: \[\left (K_{{D}} \right )_{A} \frac{\left [ A \right
]_{{org}}}{\left [ A \right ]_{{aq}}}\]
