Registration Dossier

Environmental fate & pathways

Biodegradation in water: screening tests

Administrative data

Endpoint:
biodegradation in water: ready biodegradability
Type of information:
experimental study
Adequacy of study:
key study
Study period:
5th June - 3rd October 2019
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study

Data source

Reference
Reference Type:
study report
Title:
Unnamed
Year:
2019
Report date:
2019

Materials and methods

Test guidelineopen allclose all
Qualifier:
according to guideline
Guideline:
OECD Guideline 301 F (Ready Biodegradability: Manometric Respirometry Test)
Qualifier:
according to guideline
Guideline:
EU Method C.4-D (Determination of the "Ready" Biodegradability - Manometric Respirometry Test)
Qualifier:
according to guideline
Guideline:
EPA OPPTS 835.3110 (Ready Biodegradability)
Version / remarks:
paragraph q.
GLP compliance:
yes (incl. QA statement)

Test material

Constituent 1
Chemical structure
Reference substance name:
3a,4,7,7a-tetrahydro-1H-indene
EC Number:
221-260-3
EC Name:
3a,4,7,7a-tetrahydro-1H-indene
Cas Number:
3048-65-5
Molecular formula:
C9H12
IUPAC Name:
3a,4,7,7a-tetrahydro-1H-indene
Constituent 2
Chemical structure
Reference substance name:
4-vinylcyclohexene
EC Number:
202-848-9
EC Name:
4-vinylcyclohexene
Cas Number:
100-40-3
Molecular formula:
C8H12
IUPAC Name:
4-vinylcyclohexene
Constituent 3
Chemical structure
Reference substance name:
Cyclopentadiene
EC Number:
208-835-4
EC Name:
Cyclopentadiene
Cas Number:
542-92-7
Molecular formula:
C5H6
IUPAC Name:
cyclopenta-1,3-diene
Constituent 4
Chemical structure
Reference substance name:
cis-1,2-Divinylcyclobutane
Cas Number:
2422-85-7
Molecular formula:
C8H12
IUPAC Name:
cis-1,2-Divinylcyclobutane
Constituent 5
Chemical structure
Reference substance name:
Ethylbenzene
EC Number:
202-849-4
EC Name:
Ethylbenzene
Cas Number:
100-41-4
Molecular formula:
C8H10
IUPAC Name:
ethylbenzene
Constituent 6
Chemical structure
Reference substance name:
5-vinylnorborn-2-ene
EC Number:
221-259-8
EC Name:
5-vinylnorborn-2-ene
Cas Number:
3048-64-4
Molecular formula:
C9H12
IUPAC Name:
5-vinylbicyclo[2.2.1]hept-2-ene
Constituent 7
Chemical structure
Reference substance name:
Cycloocta-1,5-diene
EC Number:
203-907-1
EC Name:
Cycloocta-1,5-diene
Cas Number:
111-78-4
Molecular formula:
C8H12
IUPAC Name:
cycloocta-1,5-diene
Constituent 8
Chemical structure
Reference substance name:
3a,4,7,7a-tetrahydro-4,7-methanoindene
EC Number:
201-052-9
EC Name:
3a,4,7,7a-tetrahydro-4,7-methanoindene
Cas Number:
77-73-6
Molecular formula:
C10H12
IUPAC Name:
3a,4,7,7a-tetrahydro-4,7-methanoindene,
Constituent 9
Chemical structure
Reference substance name:
3a,4,7,7a-tetrahydro-4-methyl-1H-indene
EC Number:
231-021-5
EC Name:
3a,4,7,7a-tetrahydro-4-methyl-1H-indene
Cas Number:
7413-02-7
Molecular formula:
C10H14
IUPAC Name:
4-methyl-3a,4,7,7a-tetrahydro-1H-indene
impurity 1
Chemical structure
Reference substance name:
Combination of: 6-(cyclohex-3-en-1-yl)bicyclo[2.2.1]hept-2-ene 2-vinyl-1,2,3,4,4a,5,8,8a-octahydro-1,4-methanonaphthalene 6-vinyl-1,4,4a,5,6,7,8,8a-octahydro-1,4-methanonaphthalene 2-vinyl-1,2,3,4,4a,5,8,8a-octahydro-1,4:5,8-dimethanonaphthalene 2,2'-bi(bicyclo[2.2.1]heptane-5,5'-diene) 3a,4,4a,5,8,8a,9,9a-octahydro-1H-5,8-methanocyclopenta[b]naphthalene 4,4a,4b,5,8,8a,9,9a-octahydro-1H-1,4-methanofluorene
Molecular formula:
C13H18 to C14H18
IUPAC Name:
Combination of: 6-(cyclohex-3-en-1-yl)bicyclo[2.2.1]hept-2-ene 2-vinyl-1,2,3,4,4a,5,8,8a-octahydro-1,4-methanonaphthalene 6-vinyl-1,4,4a,5,6,7,8,8a-octahydro-1,4-methanonaphthalene 2-vinyl-1,2,3,4,4a,5,8,8a-octahydro-1,4:5,8-dimethanonaphthalene 2,2'-bi(bicyclo[2.2.1]heptane-5,5'-diene) 3a,4,4a,5,8,8a,9,9a-octahydro-1H-5,8-methanocyclopenta[b]naphthalene 4,4a,4b,5,8,8a,9,9a-octahydro-1H-1,4-methanofluorene
Constituent 10
Chemical structure
Reference substance name:
4,4a,4b,5,8,8a,9,9a-octahydro-1H-1,4-methanofluorene OR 4,4a,4b,5,8,8a,9,9a-octahydro-1H-1,4:5,8-dimethanofluorene
Molecular formula:
C14H18 to C15H18
IUPAC Name:
4,4a,4b,5,8,8a,9,9a-octahydro-1H-1,4-methanofluorene OR 4,4a,4b,5,8,8a,9,9a-octahydro-1H-1,4:5,8-dimethanofluorene
Constituent 11
Chemical structure
Reference substance name:
3a,4,4a,5,8,8a,9,9a-octahydro-4,9:5,8-dimethano-1H-benz[f]indene
EC Number:
230-512-1
EC Name:
3a,4,4a,5,8,8a,9,9a-octahydro-4,9:5,8-dimethano-1H-benz[f]indene
Cas Number:
7158-25-0
Molecular formula:
C15H18
IUPAC Name:
3a,4,4a,5,8,8a,9,9a-octahydro-1H-4,9:5,8-dimethanocyclopenta[b]naphthalene
Constituent 12
Reference substance name:
Tetramers of cyclopentadiene and 1,3-butadiene
Molecular formula:
C16H24 to C20H24
IUPAC Name:
Tetramers of cyclopentadiene and 1,3-butadiene
Test material form:
liquid
Details on test material:
Light brown liquid.
Batch number 776809

Study design

Oxygen conditions:
aerobic
Inoculum or test system:
sewage, predominantly domestic, non-adapted
Details on inoculum:
- Source of inoculum/activated sludge (e.g. location, sampling depth, contamination history, procedure): Severn Trent WWTP Loughborough, Leicestershire on 5/8/19.
- Water filtered: yes, first 200mL discarded,
- Type and size of filter used, if any: coarse
- maintained on aeration at 21-22C prior to use
Duration of test (contact time):
28 d
Initial test substance concentration
Initial conc.:
100 mg/L
Based on:
test mat.
Parameter followed for biodegradation estimation
Parameter followed for biodegradation estimation:
O2 consumption
Details on study design:
TEST CONDITIONS
- Composition of medium as used: KH2PO4 85mg/L, K2HPO4 217.5mg/L, Na2HPO4.2H2O 334mg/L, NH4Cl 5mg/L, CaCL2 27.5mg/L, MgSO4.7H20 22.5mg/L, FeCL3.6H20 0.25mg/L. Adjusted from pH 7.7 to 7.4 using HCl.
- Solubilising agent (type and concentration if used):none
- Test temperature: 20-22C
- pH: 7.4
- pH adjusted: / no
- CEC (meq/100 g):
- Aeration of dilution water: no
- Suspended solids concentration:
- Continuous darkness: no
- Replicates: Test performed in duplicate

CONTROL AND BLANK SYSTEM
- Inoculum blank: yes
- Toxicity control: using substrate and sodium benzoate
Reference substance
Reference substance:
benzoic acid, sodium salt

Results and discussion

% Degradation
Parameter:
% degradation (O2 consumption)
Value:
2
Sampling time:
28 d

BOD5 / COD results

Results with reference substance:
Sodium benzoate showed 92% degradation after 14 days with more than 60% degradation in 10 days window. 97% degradation after 28 days.

Any other information on results incl. tables

The mean BOD of the innoculated mineral medium control was 15.6mg O2/L after 28 days and therefore satisfied the validation criteria of the test guidelines. The pH of the innoculated test items was 7.5 at day 28 and therefore within permissible limits. The difference in the results between the two replicates was within the permissible 20% variation. The toxicity control attained 30% biodegradation after 14 days and 32% after 28 days confirming that the test item was not toxic to the sewage treatment microorganism used in the study.

Applicant's summary and conclusion

Validity criteria fulfilled:
yes
Interpretation of results:
not readily biodegradable
Executive summary:

In a guideline and GLP manometric respiration ready biodegradation study, the substance THI TM was only degraded by 2%. It is not therefore readily biodegradable.