Registration Dossier

Environmental fate & pathways

Biodegradation in water: screening tests

Currently viewing:

Administrative data

Link to relevant study record(s)

Description of key information

Readily biodegradable

Key value for chemical safety assessment

Additional information

For the evaluation of the biodegradability of methyl methacrylate the following test result is considered:

MITI-I-Test (OECD 301C): 94% degradation after 14 days. (CITI, 1992).

Although in the key-study the criterion of the 10-day window was not assessed, the high degradation rate of 94% within 14 days in the MITI-I-Test indicates that the criterion of the 10 d-window is likely fulfilled. In addition, all of the other esters of the category and methacrylic acid (CAS# 79-41-4), the primary metabolite, are readily biodegradable with fulfilment of the 10-day window.

The following information is taken into account for any hazard / risk / persistency assessment:

MMA, like all the other substances of the category, is readily biodegradable.

Based on the TGD the defaults for readily biodegradable substances the first order constants and half lives for biodegradation in surface water for all members of the category are as follows:

Rate constant (surface water) ksw = 0.047 d-1 (at 22/25 °C)

Half life (surface water ) [DT50] = 14 d (at 22/25 °C)