Registration Dossier

Environmental fate & pathways

Endpoint summary

Administrative data

Description of key information

An analogue test item attained 0 % biodegradation after 28 days and therefore cannot be considered to be readily biodegradable (OECD 301 B).

Additional information

Biodegradation

A key study was performed to assess the ready biodegradability of an analogue test item in an aerobic aqueous medium. The method followed was designed to be compatible with the OECD Guidelines for Testing of Chemicals (1992) No. 301B, "Ready Biodegradability; CO2Evolution Test" referenced as Method C.4-C of Commission Regulation (EC) No. 440/2008 and US EPA Fate, Transport, and Transformation Test Guidelines OCSPP 835.3110 (Paragraph (m)).

 

The test item, at a concentration of 10 mg carbon/L, was exposed to activated sewage sludge micro-organisms with mineral medium in sealed culture vessels in the dark at temperatures of between 21 and 24 °C for 28 days. Following the recommendations of the International Standards Organisation (ISO 1995) and the published literature (Handleyet al, 2002), the test item was adsorbed onto granular silica gel prior to dispersion in the test medium to aid dispersion of the test item in the test medium and to increase the surface area of the test item exposed to the test organisms.

The biodegradation of the test item was assessed by the determination of carbon dioxide produced. Control solutions with inoculum and the reference item, sodium benzoate, together with a toxicity control were used for validation purposes. The analogue test item attained 0% biodegradation after 28 days and therefore cannot be considered to be readily biodegradable under the strict terms and conditions of OECD Guideline No. 301B.