Registration Dossier

Environmental fate & pathways

Endpoint summary

Administrative data

Description of key information

Additional information

Assessing ready biodegradability of the substance, results of tests from each constituent is used, as no valid test carried out with the mixture is available.

In a test on ready biodegradability of adipic acid conducted according to the OECD guideline 301 D (Determination of the Ready biodegradability: Closed Bottle Test) 83 % degradation was observed after 30 days (Gerike, 1979).

Regarding the ready biodegradability of succinic acid, an aerobic ready test, performed according to the national Japanese standard method comparable to the OECD TG 301 C guideline, showning more than 90% biodegradation after 14 days (MITI, 2002).

Concerning ready biodegradability of glutaric acid, 100 % of the test substance had been degraded after 14 days in a Modified OECD Screening Test (Bayer AG, 1993).

Based on this result the substance should be classified as readily biodegradable.

With regard to dicarboxylic acids, only one test for inherent biodegradation of dicarboxylic acids in water exists. The test was performed according to OECD Guideline 302 B (Inherent biodegradability: Zahn-Wellens/EMPA Test) and a biodegradation rate of 99 % after 7 d was observed (BASF, 1988).

Based on these results the subtsance is considered to be inherently biodegradable.

In a modified Zahn-Wellens-Test, using surface water from the river Main (Germany), 90% of adipic acid was degraded within 8 days (Zahn, 1980) indicating that the substance is biodegradable in surface waters.

The potential for biodegradation in soil of adipic acid is decribed, by a test conducted according to a national standard method of the U. S. Food and Drug Administration (FDA). An 84 % conversion of adipic acid carbon content to carbon dioxide was found after 30 days aerobic incubation in soil (Sharabi,1993). 60 % degradation was reached in 1 to 6 d. Adipic acid is therefore considered to be readily biodegradable in soil.

As it is shown that all constituents of the mixture are readily biodegradable, it is concluded that carboxylic acids, di-, C4 -6 is also biodegradable in surface waters, waste water treatment plants as well as in soil.