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Environmental fate & pathways

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Additional information

1,3-propanesultone (CAS 1120-71-4) is not stable in the environment. On contact with water the substance hydrolyses rapidly forming 3-hydroxypropanesulphonic acid (CAS 15909-83-8) by ring cleavage of 1,3-propanesultone. Hydrolysis is the main degradation pathway of the substance. Due to the rapid hydrolysis the parent substance 1,3-propanesultone will most probably not exist in the environment and thus persistency of the parent substance can be excluded. Persistency can also be excluded on the basis of the available data on biodegradation. A ready biodegradation test according to OECD 301 C on 1,3-propanesultone demonstrated a degradation rate of 95% after 28 days based on the O2 consumption of the inoculum (81% based on TOC removal). For 3-hydroxypropanesulphonic acid, the product of hydrolysis, a degradation rate of 89% was determined after 28 days (DOC removal, OECD 301E).

The parent substance 1,3-propanesultone as well as the product of hydrolysis 3-hydroxypropanesulphonic acid are characterised by low log Pow and low log Koc values. Thus, both substances have no potential for bioaccumulation or for adsorption to soil or suspended matter. A distribution to the air and subsequent transportation through the atmosphere is unlikely (VP < 1 Pa).

Conclusion

Due to the rapid hydrolysis 1,3-propanesultone is not stable in the environment. It can be assumed that 1,3-propanesultone will not exist under environmentally relevant conditions. Therefore, the assessment of the environmental fate focusses on 3-hydroxypropanesulphonic acid as the product of hydrolysis. The substance 3-hydroxypropanesulphonic acid will be rapidly removed from the environment by biodegradation. Adsorption and/or bioaccumulation of the substance are not expected.