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Physical & Chemical properties

Partition coefficient

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Description of key information

Log Kow: -0.2 to -1.8 (Citric acid)

Key value for chemical safety assessment

Additional information

Trisodium citrate is expected to be fully dissociated to citrate and sodium in water. Log Kow is not relevant for the sodium ions.

A number of studies are available that indicate that citric acid/citrate has a low Log Kow. Secondary sources to which data could not be assigned gave values of -1.64 and -1.76. A reliable study conducted according to generally accepted scientific principles gave values in the range -1.6 to -1.8 (Kuban 1991). A reliable study conducted according to generally accepted scientific principles, ion-pair octanol water partition coefficients of -0.76±0.10 for H2A- and -0.21±0.11 for H3A were determined (Avdeef 1992). There is some variation in the results but this is not considered critical for a substance with very low Log Kow.