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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
Study period:
1974-04 to 1974-06
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
other: see 'Remark'
Remarks:
The authors followed a methodology similar to the OECD guideline 301D. GLP standards are not specified and some details on methodology are missing. However, basic data are provided, therefore this study should be considered a Klimisch 2e: study well documented, meets generally accepted scientific principles, acceptable for assessment.

Data source

Reference
Reference Type:
study report
Title:
Unnamed
Year:
2001
Report date:
1974

Materials and methods

Test guideline
Qualifier:
equivalent or similar to guideline
Guideline:
OECD Guideline 301 D (Ready Biodegradability: Closed Bottle Test)
Deviations:
not specified
GLP compliance:
not specified

Test material

Constituent 1
Chemical structure
Reference substance name:
Benzoyl chloride
EC Number:
202-710-8
EC Name:
Benzoyl chloride
Cas Number:
98-88-4
Molecular formula:
C7H5ClO
IUPAC Name:
benzoyl chloride
Details on test material:
- Name of test material (as cited in study report): benzoylchlorid

No more data available

Study design

Oxygen conditions:
aerobic
Inoculum or test system:
sewage, domestic (adaptation not specified)
Details on inoculum:
No data available
Duration of test (contact time):
20 d
Initial test substance concentration
Initial conc.:
2.4 mg/L
Based on:
test mat.
Parameter followed for biodegradation estimation
Parameter followed for biodegradation estimation:
O2 consumption
Details on study design:
TEST CONDITIONS
- pH: 2.1


No more data available

Results and discussion

Preliminary study:
No data available
Test performance:
No data available
% Degradationopen allclose all
Parameter:
% degradation (O2 consumption)
Value:
74
Sampling time:
5 d
Parameter:
% degradation (O2 consumption)
Value:
93
Sampling time:
10 d
Parameter:
% degradation (O2 consumption)
Value:
95
Sampling time:
20 d

BOD5 / COD results

BOD5 / CODopen allclose all
Parameter:
COD
Value:
1 750 other: mg/L
Parameter:
BOD5
Value:
1 290 other: mg/L
Parameter:
BOD5*100/COD
Value:
74
Results with reference substance:
No data available

Any other information on results incl. tables

Table: Overview of the data, extrapolated from BOD and COD supplied

pH COD BOD5 BOD5/COD BOD10 BOD10/COD BOD20 BOD20/COD
Benzoyl chloride 2.1 1750 1290 74% 1630 93% 1670 95%

Applicant's summary and conclusion

Validity criteria fulfilled:
not specified
Interpretation of results:
readily biodegradable
Conclusions:
The authors tested the biodegradability of benzoyl chloride with a methodology similar to the OECD guideline 301D. In the test conditions, benzoyl chloride was degraded about 74 %, 93 % and 95 % after five, ten and twenty days of incubation respectively. Thus, benzoyl chloride should be considered as readily biodegradable in the test conditions.
Executive summary:

The authors tested the biodegradability of benzoyl chloride (CAS n° 98 -88 -4) with a methodology similar to the OECD guideline 301D. Few details are available on the materials and methods. In the test conditions, after 5, 10 and 20 days of incubation, benzoyl chloride at 2.4 mg/L was degraded about 74 %, 93 % and 95 %. Thus, the results indicate that the test substance benzoyl chloride should be considered as readily biodegradable in the environment according to EC regulation 1272/2008 and the former 67/548/EC regulation.

No data was available on the GLP status of the study. Besides, the limited amount of available information does not allow to verify the fulfillment of validity criteria. However, since the study was conducted with an accepted test method and that basic data are provided, it should be considered as reliable with restictions, and the document considered as acceptable for assessment.