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The new ECHA CHEM database has been released by ECHA, and it now contains all REACH registration data. There are more details on the transition of ECHA's published data to ECHA CHEM here.

Diss Factsheets

Administrative data

Endpoint:
biodegradation in soil: simulation testing
Data waiving:
study scientifically not necessary / other information available
Justification for data waiving:
the study does not need to be conducted because the substance is readily biodegradable
Cross-reference
Reason / purpose for cross-reference:
data waiving: supporting information
Reference
Endpoint:
biodegradation in water: ready biodegradability
Type of information:
experimental study
Adequacy of study:
key study
Study period:
Jan. 9, 1997-Feb. 6, 1997
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
other: Guideline study.
Qualifier:
according to guideline
Guideline:
OECD Guideline 301 F (Ready Biodegradability: Manometric Respirometry Test)
Deviations:
no
GLP compliance:
yes (incl. QA statement)
Oxygen conditions:
aerobic
Inoculum or test system:
activated sludge, domestic (adaptation not specified)
Details on inoculum:
- Source of inoculum/activated sludge (e.g. location, sampling depth, contamination history, procedure): Chester Sewage Works, Welsh Water
- Preparation of inoculum for exposure: Inoculum was collected the day before the test. It was homogenized for two minutes, then allowed to settle. The supernatent was filtered through medical gauze.
Duration of test (contact time):
28 d
Initial conc.:
100 mg/L
Based on:
test mat.
Parameter followed for biodegradation estimation:
O2 consumption
Details on study design:
TEST CONDITIONS
- Composition of medium: OECD mineral salts medium
- Test temperature: 21.4-21.7 degree C
- Aeration of dilution water: aerated with moist air for 22 h


TEST SYSTEM
- Culturing apparatus: respirometer flask
- Number of culture flasks/concentration: 3 test substance only, 2 test substance and sodium benzoate (inhibition controls)
- Measuring equipment: Co-ordinated Environmental Servies Ltd. Aerobic Respirometer
- Test performed in closed vessels due to significant volatility of test substance: yes, closed with CO2 trap

SAMPLING
- Sampling frequency: hourly
- Sampling method: respirometer


CONTROL AND BLANK SYSTEM
- Inoculum blank: 2
- Other: 2 controls using sodium benzoate


STATISTICAL METHODS: CESAN Data Analysis Program v1.1
Reference substance:
benzoic acid, sodium salt
Parameter:
% degradation (O2 consumption)
Value:
83
St. dev.:
16
Sampling time:
10 d
Remarks on result:
other: end of 10 day window
Parameter:
% degradation (O2 consumption)
Value:
98
St. dev.:
12
Sampling time:
28 d
Parameter:
% degradation (O2 consumption)
Value:
81
Sampling time:
28 d
Remarks on result:
other: inhibition control
Details on results:
% degradation of test samples at end of 10 day window: 87, 96, 65
% degradation of test samples on day 28: 104, 104, 84
% degradation of inhibition controls: 81, 82 - test substance does not inhibit degradation.
Results with reference substance:
The reference substance was 95% degraded by day 14, and degraded 104% by day 28.
Validity criteria fulfilled:
yes
Interpretation of results:
readily biodegradable
Conclusions:
The test substance is readily biodegradable, and is not inhibitory.
Executive summary:

This study examined the ready biodegradability of SBP 80-95 LNH. Activated sludge was exposed to a concentration of 100 mg/l of test substance. The O2 consumption was then monitored for the next 28 days. Sodium benzoate was used as the reference substance. The test substance was 98% degraded at the end of 28 days, and 83% degraded at the end of the 10 -day window. The reference substance was 104% degraded, therefore the test is valid. The test substance is readily biodegradable and does not inhibit degradation.

Data source

Materials and methods

Results and discussion

Applicant's summary and conclusion