Registration Dossier

Environmental fate & pathways

Endpoint summary

Administrative data

Description of key information

Additional information

Using standard ready biodegradation test conditions, the test chemical displays negligible degradation.

1) Key: Biodegradation screening test: K2, per OECD 301F & GLP guideline; not readily biodegradable

2) Supporting: biodegradation screening test: K2, per OECD 301F & GLP guideline; not readily biodegradable

As a consequence the biodegradation potential of DAPD was further assessed in a number of inherent biodegradation studies. In these studies a surfactant is added to the test bottles in order to enhance the water solubility of the test substance, a lower concentration of test substance is used and an elevated sludge concentration when compared to a ready biodegradation test.

3) Supporting: Inherent biodegradation test: K2, per OECD 302C: no degradation

4) Supporting: Inherent biodegradation test: K1, per OECD 301B and 302C & GLP guideline; potential to degrade

5) Key: Inherent biodegradation test: K1, per OECD 301B and 302C & GLP guideline; inherent biodegradation observed

 

In these inherent biodegradation tests it was demonstrated that slow inherent biodegradation of DAPD does occur, yielding 23 to 37% of mineralisation after 56 -63 days. Furthermore, primary degradation of DAPD into water soluble metabolites / degradation products was found to occur much faster and lead to the complete removal of the parent compound from the test system within 28 days.