Registration Dossier

Environmental fate & pathways

Endpoint summary

Administrative data

Description of key information

Additional information

Biodegradation

In a key study performed to OECD Guideline 310 the results at the end of the 35-day test period indicated that the activated sludge inoculum was active, degrading the reference substance 94.1%. The average cumulative percent biodegradation for the test item was 73.1%.

Biodegradation ≥ 60% ThIC within a 10-day window of reaching 10% ThIC in this test demonstrates that a test substance is readily biodegradable under aerobic conditions. The average cumulative percent biodegradation for the test item was 73.1%. The test item may not be considered readily biodegradable under aerobic conditions since biodegradation ≥ 60% ThIC was not achieved within a 10-day window of reaching 10% ThIC. However, as a UVCB, the test item may be considered rapidly biodegradable since the pass level of 60% of ThIC was achieved within 28 days.

In the supporting study conducted to the OECD 301B guideline under GLP the experimental phase was stopped after 28 days.The test material attained 57.0% of biodegradation on day 28.

The test substance is rapidly biodegradable under the conditions of the studies.

Abiotic Degradation

The substance is readily biodegradable with an estimated water solubility of less than 1 mg/L (experimental determination of a precise value for water solubility is technically unfeasible). The substance is potentially unstable in water however experimental determination of abiotic degradation is technically unfeasible

Adsorption/desorption

The absorption coefficient of the test item has been determined to be > 4.27 E05, Log Koc => 5.63. The substance has low mobility in soil.

Henry's Law Constant

Henry's Constant (25°C) = 0.041 Pa/m3/mol

Bioaccumulation

In accordance with Annex IX column 2 of the REACH Regulation, a study for bioaccumulation does not need to be conducted if the substance has a low potential for bioaccumulation. The experimentally derived Log Pow value for the substance has been identified as > 9.4, with extrapolation to a Log Pow = 11.7. A QSAR calculation of Log Pow determined that the estimated value of Log Pow = 16.6. ECHA Guidance on Information requirements and chemical safety assessment Chapter R11: PBT assessment (page 28) on determination of bioaccumulation potential states: The aquatic BCF of a substance is probably lower than 2000 L/kg if the calculated log Kow is higher than 10.

Environmental distribution

The substance is predicted to partition mainly to soil (33.1%) and sediment (64.1%)