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Environmental fate & pathways

Biodegradation in soil

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Description of key information

biodegradable under aerobic soil conditions

Key value for chemical safety assessment

Half-life in soil:
16 d
at the temperature of:
25 °C

Additional information

A single, non-guideline study published in 1966. A soil microorganism inoculum was used in an aerobic water-based medium at 25C. 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.