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Environmental fate & pathways

Biodegradation in water: screening tests

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Link to relevant study record(s)

Reference
Endpoint:
biodegradation in water: ready biodegradability
Type of information:
read-across based on grouping of substances (category approach)
Adequacy of study:
key study
Study period:
not specified
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
guideline study without detailed documentation
Justification for type of information:
see attached justification for read across
Reason / purpose:
read-across source
Reason / purpose:
read-across source
Qualifier:
according to
Guideline:
OECD Guideline 301 B (Ready Biodegradability: CO2 Evolution Test)
Deviations:
not specified
Qualifier:
according to
Guideline:
OECD Guideline 301 F (Ready Biodegradability: Manometric Respirometry Test)
Deviations:
not specified
GLP compliance:
not specified
Remarks:
the test was conducted in an academic setting without GLP certification
Oxygen conditions:
aerobic
Duration of test (contact time):
28 d
Key result
Parameter:
% degradation (O2 consumption)
Value:
22.4
St. dev.:
2.8
Sampling time:
28 d
Remarks on result:
other: OECD 301F (MRT), read-across from DiPETMP
Remarks:
inherently biodegradable
Key result
Parameter:
% degradation (O2 consumption)
Value:
26
Sampling time:
28 d
Remarks on result:
other: OECD 301B, read across from PETMP
Remarks:
inherently biodegradable
Validity criteria fulfilled:
yes
Interpretation of results:
inherently biodegradable
Remarks:
With respect to inherent biodegradability tests (OECD 302A-C) the guidelines state: “Biodegradation above 20% of theoretical […] may be regarded as evidence of inherent, primary biodegradability”(OECD 2006, paragraph 36; ECHA 2017, page 216). As far as substances measured here achieved above 20% biodegradation even in an OECD 301 test, this is considered as evidence of their inherent primary biodegradability.
Conclusions:
Based on read across from PETMP and DiPETMP, PETMA is considered not readily biodegradable. However, the biodegradation exceeds 20%, PETMA is considered as inherently biodegradable.

Description of key information

Based on read across from PETMP and DiPETMP, PETMA is considered not readily biodegradable. However, the biodegradation exceeds 20%, PETMA is considered as inherently biodegradable.

Key value for chemical safety assessment

Biodegradation in water:
inherently biodegradable
Type of water:
freshwater

Additional information