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Environmental fate & pathways

Biodegradation in water: screening tests

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Description of key information

The substance is readily biodegradable according to OECD criteria.  

Key value for chemical safety assessment

Biodegradation in water:
readily biodegradable
Type of water:
freshwater

Additional information

The ready biodegradability of propylenediamine (CAS 78 -90 -0) as investigated in a study according to OECD 301D using adapted, predominantly domestic sewage as inoculum (Bayer AG, 2001; report no. 82MB-CB0028). Based on oxygen consumption, no biodegradation of the test item was observed under test conditions (0% after 20 d). The documentation of the study, which was performed in1982, falls short of today's requirements, but corresponds to the standards at the time they were conducted. However, the quality of the study performance is nevertheless not influenced.

In a batch test according to OECD 302B using industrial activated sludge as inoculum, the substance was easily eliminated from water after an adaptation phase (80% DOC removal after 18 d; BASF AG, 1977a; report no. 959151/17). In a second batch, which was performed with the inoculum of the previous test (= adapted), the removal was 91% in 7 days (BASF AG, 1977b; report no 959151/17). In both cases the DOC removal was mainly by biodegradation based on the shape of the degradation curve.

In order to fulfil the information requirements on ready biodegradability using valid data, a read-across was performed to the structurally similar substance 1,3 -propanediamine (CAS 109 -76 -2). The ready biodegradability was studied in a DOC die away test according to OECD 301A and under GLP conditions (BASF AG, 2003; report no. 02/0281/21/1). Municipal activated sludge from a laboratory wastewater treatment plant fed with municipal sewage, which was no adapted to the sbustance, was used as inoculum. The substance was found to be readily biodegradable as the DOC removal was already 97% after 5 days.

The read-across approach will be verified in a extended ready biodegradability study according to OECD 301 with an extended exposure period (60 d).

Therefore, it can be concluded that propylenediamine is considered to be readily biodegradable.