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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
Reliability:
1 (reliable without restriction)

Data source

Reference
Reference Type:
study report
Title:
Unnamed
Year:
2016

Materials and methods

Test guideline
Qualifier:
according to guideline
Guideline:
OECD Guideline 301 D (Ready Biodegradability: Closed Bottle Test)
GLP compliance:
yes (incl. QA statement)

Test material

Constituent 1
Chemical structure
Reference substance name:
4-hexylresorcinol
EC Number:
205-257-4
EC Name:
4-hexylresorcinol
Cas Number:
136-77-6
Molecular formula:
C12H18O2
IUPAC Name:
4-hexylresorcinol

Study design

Oxygen conditions:
aerobic
Inoculum or test system:
other: Secondary effluent of a treatment plant
Details on inoculum:
It was filtered through Whatman No 1 filter paper and incubated at test temperature 22± 2℃ in incubator for 6 days.
Duration of test (contact time):
ca. 28 d
Initial test substance concentration
Initial conc.:
ca. 2 mg/L
Based on:
formulation
Parameter followed for biodegradation estimation
Parameter followed for biodegradation estimation:
O2 consumption
Reference substance
Reference substance:
other: Potassium hydrogen phthalate

Results and discussion

% Degradationopen allclose all
Parameter:
% degradation (O2 consumption)
Value:
0.39
Sampling time:
7 d
Parameter:
% degradation (O2 consumption)
Value:
1.96
Sampling time:
14 d
Parameter:
% degradation (O2 consumption)
Value:
7.83
Sampling time:
21 d
Parameter:
% degradation (O2 consumption)
Value:
11.36
Sampling time:
28 d

BOD5 / COD results

Results with reference substance:
The percent degradation for reference substance on 7, 14, 21 and 28 day was 64.68, 80.85, 85.11 and 80.85%, respectively.

Applicant's summary and conclusion

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