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Diss Factsheets

Environmental fate & pathways

Endpoint summary

Administrative data

Description of key information

Additional information

The ready biodegradability of the test item Hostanox O 3 Pills was determined with non adapted activated sludge in the Manometric Respirometry Test for a period of 28 days. The study was conducted according to OECD guideline 301 F. The test item concentration selected as appropriate was 25 mg/L, corresponding to a ThOD of 61.25 mg O2/L per test vessel. The oxygen was depleted by the respiration of bacteria and the degradation was followed by measuring the oxygen concentration. The biodegradation rate is therefore expressed as the percentage BOD (biological oxygen demand) and was calculated for each study day.

In order to check the activity of the test system sodium benzoate was used as functional control. The pass level > 60 % was reached after 2 days. The biodegradation rate reached a maximum of 97 % degradation on day 26.

In the toxicity control containing both test and reference item 48 % degradation occurred within 14 days. After 28 days the biodegradation came to 50 %. The degradation of the reference item was not inhibited by the test item.

Both test item replicates did not reach the 10 % level (beginning of biodegradation). The mean biodegradation on day 28 was 3 %.