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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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

Endpoint summary

Administrative data

Description of key information

Abiotic degradation

Phototransformation and hydrolysis are the main abiotic degradation pathways for a substance.The magnesium sulfonate target substance (CAS 231297-75-9) is neither susceptible for phototransformation in air, water and soil nor for hydrolysis under environmental conditions.The test substance is a complex mixture (UVCB) for which the test guideline for hydrolysis is not recommended with components having different hydrolytic rates. The representative structure of the test substance contains a phenyl sulphonate functional group and this suggests that hydrolysis at environmentally relevant pH levels and temperatures would not readily occur.

Biotic degradation

The magnesium sulfonate target substance (CAS 231297-75-9) is not expected to be biodegradable based on biodegradation studies with magnesium sulfonate and calcium sulfonate read-across substances.Biodegradability of a calcium sulfonate read-across substance (CAS 70024-69-0) was investigated according to OECD Guideline 301D (key information). The effects of the test substance were assessed based on chemical oxygen demand (COD) measurements using activated sludge from a domestic wastewater plant as inoculum. The test substance attained 8 % degradation during the test duration of 28 days.In a test assigned as supporting information, magnesium sulfonate read-across substance (CAS 71786-47-5; Sanitised, H., 1995) was investigated concerning biodegradability following OECD Guideline 301 B. Activated sludge from a domestic wastewater plant was used as inoculum without pre-adaption. The test substance attained only 1.5 % degradation at the end of the test (after 28 days).


The magnesium sulfonate target substance (CAS 231297-75-9) is not expected to bioaccumulate.Bioaccumulation in aquatic biota is expected for substances possessing a partition coefficient (logPow) in the range of 4.5 to 6 (ECHA Guidance R.11 PBT Assessment). A higher logPow is probably more an effect of solubility than lipophilicity.The magnesium sulfonate target substance (CAS 231297-75-9)possesses a logPow of 22.17 (EPIWIN prediction), thus no strong potential to bioaccumulation is expected. This is supported by the predicted low Bioconcentration Factor (BCF) of 70.8 L/kg (Chemservice S.A., 2012c).Furthermore, based on the assessment of various sulfonates (Sanitised, 2012), the hazard profile does neither meet the B nor the vB criterion.

Transport and distribution

A Mackay Level III fugacity modeling calculation was performed with EPIWIN by Chemservice S.A. (2012b). With a mass amount of 99.4 % for soil, it is clear thatthe magnesium sulfonate target substance (CAS 231297-75-9)will mainly be present in soil and is likely to persist there rather than in other environmental compartments.

A soil adsorption study ofthe magnesium sulfonate target substance (CAS 231297-75-9) is technically not feasible. A prediction with KOCWIN v2.00 revealed a logKoc of 13.3 for C20 alkyl chains. The Henry´s Law Constant is predicted as 0.0613 Pa-m³/mol (Bond-Method, EPIWIN). This value is used in the chemical safety assessment in order calculate the PNECsediment (freshwater and marine water) of themagnesium sulfonate target substance (CAS 231297-75-9).

Additional information