Registration Dossier
Registration Dossier
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EC number: 237-301-3 | CAS number: 13732-62-2
Biodegradation in soil
Administrative data
Link to relevant study record(s)
Description of key information
Biodegradable under aerobic soil conditions
Key value for chemical safety assessment
Additional information
The test substance is soluble in water and dissociates to morpholinium and toluene-4-sulphonate. As both dissociation products are assessed to be readily biodegradable, the study does not need to be conducted according to column II of Annex IX of the REACh regulation.
Nevertheless, a study is available on the biodegradation of p-hydroxybenzenesulphonic acid (CAS 1333-39-7) in soil which can be used as read-across substance to toluene-4-sulphonate as it belongs to the same category of aromatic sulphonic acids.
A soil microorganism inoculum was used in an aerobic water-based medium at 25°C [Alexander and Lustingman, 1966]. Duplicate flasks of a single test substance concentration, 75 mg/L hydroxybenzene sulfonic acid, were sampled and analyzed over 64 days for change in spectral absorbance as the measure of test substance presence. An abiotic control using HgCl2 was run in parallel. The time necessary for complete degradation was 32 days. The degradation was due to biological activity because no decreased absorbance was seen in the abiotic control. The half-life of the test substance under the conditions of this study would be less than 32 days. This is a non-guideline study, however, the study design is sufficiently representative and there are sufficient details to support a conclusion that the test substance, hydroxybenzene sulfonic acid is biodegradable under aerobic soil conditions. The study is considered to be of value in providing weight of evidence to support this conclusion.
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