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Environmental fate & pathways

Biodegradation in soil

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Description of key information

Based on the available studies on biodegradation, part of aromatic hydrocarbons, C10-13, reaction products with branched nonene, sulphonated, sodium salts is assumed to degrade readily.  Degradation products of nonyl methylnaphthalenesulphonate and nonyldimethylnaphthalenesulphonate have a lower sorption potential than the parent molecules. Due to the partial degradation of formation of Aromatic hydrocarbons, C10-13, reaction products with branched nonene, sulphonated, sodium salts as observed in a SCAS test (van Ginkel et al, 2012) Aromatic hydrocarbons, C10-13, reaction products with branched nonene, sulphonated, sodium salts cannot be considered as readily biodegradable. It is very unlikely that degradation of the non biodegradable fraction will occur in soil. Further testing in soil is therefore not expected to deliver more information.
For soil therefore a half life value of 30000 days is used until better soil data become available.

Key value for chemical safety assessment

Half-life in soil:
30 000 d
at the temperature of:
20 °C

Additional information

Based on the available studies on biodegradation, aromatic hydrocarbons, C10-13, reaction products with branched nonene, sulphonated, sodium salts degraded partly (van Ginkel et al, 2012) aromatic hydrocarbons, C10-13, reaction products with branched nonene, sulphonated, sodium salts cannot be considered as readily biodegradable. It is very unlikely that a quick further degradation of the non biodegradable constituents will occur in soil. Further testing in soil is therefore not expected to deliver more information. For soil therefore a half life value of 30000 days is used as a worst-case until better soil data become available.

The half-life of the bioavailable biodegradable fraction of aromatic hydrocarbons, C10-13, reaction products with branched nonene, sulphonated, sodium salts in the water phase of soils is expected to be in the order of a few days.