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Physical & Chemical properties

Partition coefficient

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Description of key information

The HYDROTOPES Category comprises the following 6 substances:
STS - Sodium toluene 4-sulphonate (CAS 657-84-1, EC 211-522-5)
SXS - Sodium (xylenes and 4-ethylbenzene) sulphonate (EC 701-037-1)
NH4XS - Ammonium (xylenes and 4-ethylbenzene) sulphonate (EC 943-024-5)
SCS - Sodium p-cumenesulphonate (CAS 15763-76-5, EC 239-854-6)
KCS - Potassium p-cumenesulphonate (CAS 164524-02-1, EC 629-764-9)
NH4CS - Ammonium p-cumenesulphonate (CAS 680972-33-2, EC 811-484-5) 

All the category members were tested for the partition coefficien and the log Kow values are:

STS: -3.18 (20 °C)
SXS: -3.12 (20 °C)
NH4XS: 0.07 (20 °C)
SCS: -1.1 (23 °C)

KCS: -1.4 (22 °C)
NH4CS: -1.679 (20 °C)


The results showed low or negative log Kow showing affinity to water compartent.

Key value for chemical safety assessment

Log Kow (Log Pow):
at the temperature of:
20 °C

Additional information

The highest value of log kow was selected for the risk assessment.