Registration Dossier

Environmental fate & pathways

Endpoint summary

Administrative data

Description of key information

Additional information

Biodegradation in water: Screening tests

The biodegradability of the the registered substance (24,6% a.i. SCG) was investigated in an OECD 301B ready test with non-adapted inoculum over a period of 28d. The initial test item concentration was 108 mg/L. 83 -86% Biodegradation was achieved after 28d. The 10% level of degradation was reached after 1.5d and the 60% pass level after 8d. In a toxicity test with the reference substance sodium benzoate it was demonstrated that the test item in not inhibitory.

Based on the results given before the the registered substance is readily biodegradable fulfilling the 10d window.

Biodegradation in a Sewage Treatment Plant

For the registration substance no OECD 303A Sewage treatment plant simulation test is available. But for the C12 homologue of the registration substance a 14C study was carried out. As the other homologues of the registration substance are metabolised in the same manner and both substances are readily biodegraded it is justified to use the available study for read across.

The elimination and mineralization of the test item N-Dodecanoyl[1-14C]glycine, sodium saltin an activated sludge unit was determined over a test period of 32 days according to OECD guideline 303 A.

The elimination and mineralization of N-Dodecanoyl[1-14C]glycine, sodium salt by aerobic microorganisms were determined in a continuously operating laboratory activated sludge unit simulating the activated sludge process. The degree of14C-elimination, the mineralization and the total mass balance were assessed.

The mean elimination rate for N-Dodecanoyl[1-14C]glycine, sodium saltof the influent concentration and total14C-activity in the effluent was calculated to be 97.77 %. 2.2% of 14C was found in the effluent but only 37% could be adsorbed in a reversed phase cartouche, 67% of 14C is most likely incorporated in biological material not sorbing to the cartouche. This means that only 37% of the 2.2% 14C in the effluent is as worst case related to the test substance itself (=0.8%) and thereforie the elimination in the sewage treatment plant is >99%. For exposure estimations 99% primary degradation in the sewage treatment plant is used. The mineralization had a mean value of 86.6 %, the mass balance was determined to be 91.7 % on average.

Biodegradation in Freshwater

Sodium cocoyl glycine (SCG) is readily biodegradable and according to the REACH Guidance R.16 Environmental Exposure Estimation Table 16-5 an Environmental half-life of 15d for freshwater can be assigned. Based on this assignment an OECD 309 Test (Aerobic Mineralisation in Surface Water - Simulation Biodegradaton Test) is not warranted.

Biodegradation in Aerobic Freshwater Sediment

Sodium cocoyl glycine (SCG) is readily biodegradable and according to the REACH Guidance R.16 Environmental Exposure Estimation Table 16-6 an Environmental half-life of 30d for sediment can be assigned as the estimated Kd sediment is < 100 L/kg (see IUCLID Chapter 5.4.1).. Based on this assignment an OECD 308 Test (Aerobic and Anaerobic Transformation in Aquatic Sediment Systems) is not warranted.

Biodegradation in Aerobic Soil

Sodium cocoyl glycine (SCG) is readily biodegradable and according to the REACH Guidance R.16 Environmental Exposure Estimation Table 16-6 an Environmental half-life of 30d for soil can be assigned as the estimated Kd soil is < 100 L/kg (see IUCLID Chapter 5.4.1).. Based on this assignment an OECD 307 Test (Aerobic and Anaerobic Transformation in Soil) is not warranted.