Registration Dossier

Environmental fate & pathways

Biodegradation in water and sediment: simulation tests

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Administrative data

Endpoint:
biodegradation in water: simulation testing on ultimate degradation in surface water
Type of information:
experimental study planned
Study period:
2019
Justification for type of information:
From a prolonged ready biodegradability study (OECD 301D) and an inherent biodegradability study (OECD 302B) it was seen that the substance is neither readily nor inherently biodegradable. From hydrolysis studies it is known that the substance is rather stable in water.

The registered substance is a UVCB, but its water solubility limit ranges from 1.2 to 19.6 mg/L and the average log Koc value is 1.9. These properties show that the substance exists in the water phase and does not have a high tendency to adsorb to suspended matter or sediment.
Therefore, an OECD TG 309: Aerobic Mineralisation in Surface Water - Simulation Biodegradation Test is proposed in order to refine the persistence assessment for this substance. For the purpose of REACH, the ‘pelagic test’ using natural surface water containing between 10 and 20 mgdw/L SPM is proposed.

Data source

Materials and methods

Test guideline
Qualifier:
according to
Guideline:
OECD Guideline 309 (Aerobic Mineralisation in Surface Water - Simulation Biodegradation Test)

Test material

Reference
Name:
Unnamed
Type:
Constituent
Details on test material:
Identification: PP-R-001 (also known as Trigonox 501-CS40)
Chemical Name: 1,2,4,5,7,8-Hexoxonane, 3,6,9-trimethyl-, 3,6,9-tris(Ethyl and Propyl) derivatives
IUPAC Name: Reaction mass of 3,6,9-triethyl-3,6,9-trimethyl-1,2,4,5,7,8-hexoxonane and 3,6-diethyl-3,6,9-trimethyl-9-n-propy l-1,2,4,5,7,8-hexoxonane and 3-ethyl-3,6,9-trimethyl-6,9-di-n-propyl-1,2,4,5,7,8-hexoxonane and 3,6,9-trimeth yl-3,6,9-tri-n-propyl-1,2,4,5,7,8-hexoxonane
CAS Number: 1613243-54-1
Batch Number: BYK004856-98
Purity: Not applicable
Physical state / Appearance: Clear, colorless liquid
Storage Conditions: Approximately 4 ºC in the dark

Results and discussion

Applicant's summary and conclusion