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Environmental fate & pathways

Biodegradation in water: screening tests

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Description of key information

The calcium salt of the test substance was tested in in CO2 evolution test and showed 32.1% degradation on day 29 (Stantec 2006). Based on structural similarities between CaDDNSA and its acid (DDNSA), it is concluded that DDNSA is not readily biodegradable 

Key value for chemical safety assessment

Biodegradation in water:
under test conditions no biodegradation observed

Additional information

DNNSA is a structural analogue of DDNSA. Under the conditions of the OECD 301B test, di C8-C10, branched, C9 rich, alkylnaphthalene sulphonic acid (DNNSA) was not readily biodegradable. Degradation of DNNSA was 14-17% after 28 days.In a test for inherent biodegradation, no degradation of DNNSA was observed over the 56-day study period. These results confirm the low biodegradation found in the study on the calcium salt of DDNSA.