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Environmental fate & pathways

Biodegradation in water: screening tests

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Substance is a hydrocarbon UVCB. Test results for biodegradation in water are used for classification. For the purpose of risk assessment, this endpoint is characterized using quantitative structure property relationships for representative hydrocarbon structures that comprise the hydrocarbon blocks. The environmental risk of this substance is assessed using the PETRORISK model (see Product Library in PETRORISK spreadsheet attached to IUCLID Section 13).

Distillate aromatic extracts are not readily biodegradable. In supporting OECD 301 studies, there was no observed biodegradation (0%) of DAEs either in Closed Bottle or Modified Sturm Tests after 28 days (Shell, 1994).

In another supporting study, GOHC 1468, a substance also used as read-across for UATOs, attained between 2 to 8 % degradation within 28 days and so, therefore, cannot be considered as ready biodegradable under the strict terms and conditions of OECD Guideline 301B (BP International Limited, 1990).