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Environmental fate & pathways

Biodegradation in soil

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Description of key information

50% of applied radiolabelled o-xylene was mineralised in 23 days, and 50% p-xylene was mineralised in 13 days.

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Additional information

A biodegradation in soil study does not need to be supplied as these streams are considered to be readily biodegradable in water. However, a study that approximates OECD 304A was identified for o-xylene and p-xylene (Tsao et al 1998) and so is reported here for completeness. There are several differences between the protocol followed and the standard guidelines. Only one soil type is tested and the concentration of test substance is higher than recommended (150ul/50g soil compared to 100ul/50g soil). The control test used autoclaved soil, rather than no soil. Despite these differences the study is well described and the mass balance of applied test substance is ~90 to 94%. This study demonstrated that 50% of the o-xylene and p-xylene applied to soil was mineralised to carbon dioxide in 23 and 13 days respectively.