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Environmental fate & pathways

Biodegradation in water: screening tests

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Key value for chemical safety assessment

Biodegradation in water:
inherently biodegradable

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The addition of yeast and glucose to DEGDN-contamined water caused an increase in the rate of degradation of DEGDN. Under aerobic conditions, essentially all of DEGDN was biotrasformed in less than 35 days, while degradation in pure water was minimal. Complete anaerobic degradation of 10 ppm DEGDN required only 35 days in presence of yeast compared with more than 40 days in the absence of the microorganism.

Ethanol, a product of yeast metabolism, further enhanced the degradation rate of DEGDN. Half-lives of 5 to 40 days were reported. These depended on the amount of organic nutrients/microbes present.

HPLC revealed three possible metabolites by microbial degradation of DEGDN.