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Environmental fate & pathways

Biodegradation in water: screening tests

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Endpoint:
biodegradation in water: ready biodegradability
Type of information:
experimental study
Adequacy of study:
key study
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
other: Guideline study, essential test conditions available
Remarks:
(as given in OECD SIDS)
Qualifier:
according to
Guideline:
OECD Guideline 301 C (Ready Biodegradability: Modified MITI Test (I))
GLP compliance:
no
Oxygen conditions:
aerobic
Inoculum or test system:
activated sludge (adaptation not specified)
Duration of test (contact time):
14 d
Initial conc.:
100 mg/L
Based on:
test mat.
Reference substance:
aniline
Parameter:
other: from BOD
Value:
0
Sampling time:
14 d
Remarks on result:
other: the oxygen consumption was continuously measured
Key result
Parameter:
% degradation (TOC removal)
Value:
2.5
Sampling time:
14 d
Remarks on result:
other: After termination of the test, the residual amount of the test substance was determined with TOC meter
Key result
Parameter:
% degradation (test mat. analysis)
Value:
7.2
Sampling time:
14 d
Remarks on result:
other: After termination of the test, the residual amount of the test substance was determined with LC
Details on results:
Kinetic: Not stated
Degradation products: no
Interpretation of results:
under test conditions no biodegradation observed
Endpoint:
biodegradation in water: ready biodegradability
Type of information:
experimental study
Adequacy of study:
key study
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
other: Guideline study, essential test conditions available.
Remarks:
(as given in OECD SIDS)
Qualifier:
according to
Guideline:
OECD Guideline 301 E (Ready biodegradability: Modified OECD Screening Test)
Version / remarks:
(1981)
GLP compliance:
not specified
Oxygen conditions:
aerobic
Inoculum or test system:
other: Effluent from a wastewater plant treating municipal sewage
Duration of test (contact time):
28 d
Initial conc.:
48 mg/L
Based on:
test mat.
Initial conc.:
20 mg/L
Based on:
DOC
Reference substance:
benzoic acid, sodium salt
Key result
Parameter:
% degradation (DOC removal)
Value:
0
Sampling time:
28 d
Details on results:
Degradation: 0 % by DOC after 28 days
Elimination: 0 % by DOC after 28 days
Results with reference substance:
Degradation of reference: 100% DOC after 4 day(s)

No inhibitory effect : 41% elimination of DOC after 13 days the inhibition control

Interpretation of results:
under test conditions no biodegradation observed
Conclusions:
Tris(2-hydroxyethyl) isocyanurate is not readily biodegradable.
Endpoint:
biodegradation in water: inherent biodegradability
Type of information:
experimental study
Adequacy of study:
key study
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
other: Guideline study, essential test conditions available
Remarks:
(as given in OECD SIDS)
Qualifier:
according to
Guideline:
OECD Guideline 302 B (Inherent biodegradability: Zahn-Wellens/EMPA Test)
GLP compliance:
not specified
Oxygen conditions:
aerobic
Inoculum or test system:
activated sludge, domestic (adaptation not specified)
Duration of test (contact time):
28 d
Initial conc.:
1 000 mg/L
Based on:
test mat.
Initial conc.:
400 mg/L
Based on:
DOC
Reference substance:
diethylene glycol
Key result
Parameter:
% degradation (DOC removal)
Value:
0
Sampling time:
28 d
Results with reference substance:
Degradation of reference: 100% DOC after 7 day(s)
Interpretation of results:
under test conditions no biodegradation observed

Description of key information

Biodegradation in water: screening tests: Not readily biodegradable: 0 – 7.2% (BOD, TOC removal, LC) in 14 days (OECD TG 301C), 0% (DOC) in 28 days (OECD TG 301E), 0% (DOC) in 28 days (OECD TG 302B)

Key value for chemical safety assessment

Biodegradation in water:
under test conditions no biodegradation observed

Additional information