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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.

The new ECHA CHEM database has been released by ECHA, and it now contains all REACH registration data. There are more details on the transition of ECHA's published data to ECHA CHEM here.

Diss Factsheets

Environmental fate & pathways

Adsorption / desorption

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Administrative data

Link to relevant study record(s)

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) 
In addition CaXS (Calcium Xylenesulphonate, CAS 28088-63-3, EC 248-829-9) was evaluated for complete the assessment despite it is not registered under REACH.

No experimental data are existing for the substances of the category.

Soil Adsorption Coefficient has been estimated for all substances with KOCWIN v2.00 and the results are reported below:

STS, CAS: 657-84-1; Koc: 0.3959 l/kg (Kow method)

SXS, CAS: 1300-72-7; Koc: 0.7876 l/kg (Kow method)

NH4XS, CAS: 26447-10-9; Koc: 1.126 l/kg (Kow method)

SCS, CAS: 15763-76-5; Koc: 1.246 l/kg (Kow method)

KCS, CAS: 164524-02-1; Koc: 1.246 l/kg (Kow method)

NH4CS, CAS: 37475-88-0; not estimated

The highest value of SCS has been selected as representative of the category for the chemical safety assessment

Key value for chemical safety assessment

Koc at 20 °C:

Additional information

In accordance with Column 2 of REACH Annex VIII not required: the substance has a very low logPow and therefore is likely to have a very low potential for absorption. In addition, the substance is readily biodegradable. An indicative value has been calculated with EPIWIN 4.1 to complete the assessment for all the substances. The value 1.246 l/kg has been reported as key value for safety assessment, as conservative case.