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Environmental fate & pathways

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The test item hexanal (+ 0,05 %, alpha-Tocopherol as stabilizer) was tested under aerobic conditions in the Manometric Respirometry Test following OECD 301F / EU C.4-D using a concentration of 37 mg test item/L (equivalent to a theoretical oxygen demand of 99.95 mg O2/L). Activated sludge was used as inoculum. The test was left running for 28 days. All validity criteria were met. The positive control reached the pass level of 60 % on day 3 (criterion: < 14). 

The following data could be determined for the test item hexanal 0,05 % TOCO:


10-day-window: day 1–11

degradation at the end of 10-day-window: 63 %

degradation at the end of the test: 69 %


Therefore, when applying the 10-day-window, hexanal is classified as readily biodegradable following OECD 301F/EU C.4-D.

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