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Environmental fate & pathways

Biodegradation in water: screening tests

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Description of key information

The test substance is instable in water and hydrolyses to a readily biodegradable compound. Hence, the test item is ultimately biodegradable.

Key value for chemical safety assessment

Additional information

In an OECD guideline test (closed bottle test) allyl glycidyl ether was not readily biodegradable. 5-9% of the test substance were degraded after 28d. Based on a hydrolysis test conducted according to method EU C.7, allyl glycidyl ether is not stable in water and hydrolyzes within days to weeks, depending on pH conditions. A half-life of 243 hrs at pH 4, 324 hrs at pH 7 and 171 hrs at pH 9 was determined. The main degradation product of allyl glycidyl ether is expected to be allyl (2,3-dihydroxypropyl) ether which is formed by opening of the epoxide ring. In a MITI test conducted according to OECD guideline 301 C allyl (2,3-dihydroxypropyl) ether was found to be readily biodegradable by direct measurement using GC. The measured degradation based on oxygen consumption was approximately 47% only. However, the official judgement of the National Institute of Technology and Evaluation in Japan was that allyl (2,3-dihydroxypropyl) ether was readily biodegradable. Additionally, in an inherent test the degradation of the hydrolysis product was 91% based on DOC removal. Therefore, the test substance allyl glycidyl ether is expected to ultimately degrade. The fate of the substance involves hydrolysis to allyl (2,3-dihydroxypropyl) ether and biological degradation of the hydrolysis product.

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