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Environmental fate & pathways

Biodegradation in water: screening tests

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Description of key information

During the twenty-one day biodegradation phase of the SCAS study op-TSA was 92.9% biodegraded, which implies that op-TSA is inherently biodegradable.

Key value for chemical safety assessment

Biodegradation in water:
inherently biodegradable

Additional information

A SCAS test, valid with restrictions, is available. The methods used in this study were outlined in the ABC Protocol entitled, "Semi-continuous Activated Sludge (SCAS) Biodegradation" dated March 18, 1983. This was essentially an adapted version of the SDA 1966 guideline as outlined by the EPA.


During the twenty-one day biodegradation phase of the study op-TSA was 92.9% biodegraded when initially present at 56.9 ppm. The test material is considered to undergo rapid primary biodegradation based upon this study. Examination of the microbial population data shows no evidence of adverse effects of the test compound upon the microflora present in the sludge.