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Environmental fate & pathways

Biodegradation in water: screening tests

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Administrative data

Endpoint:
biodegradation in water: ready biodegradability
Type of information:
experimental study
Adequacy of study:
key study
Study period:
-1980
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
other: see 'Remark'
Remarks:
The test was conducted under the chemical substances control law of Japan from the National institute of technology and evaluation. Experimental data from a laboratory working under the same authority that investigated the modified OECD MITI should be regarded as reliable. A test plan from the same institute from 1990 is attached.

Data source

Reference
Reference Type:
publication
Title:
Unnamed
Year:
1980
Report date:
1980

Materials and methods

Test guideline
Qualifier:
according to guideline
Guideline:
OECD Guideline 301 C (Ready Biodegradability: Modified MITI Test (I))
GLP compliance:
not specified

Test material

Constituent 1
Chemical structure
Reference substance name:
Acetaldehyde
EC Number:
200-836-8
EC Name:
Acetaldehyde
Cas Number:
75-07-0
Molecular formula:
C2H4O
IUPAC Name:
acetaldehyde
Details on test material:
- Name of test material (as cited in study report): ethanal

Study design

Oxygen conditions:
not specified
Inoculum or test system:
sewage, predominantly domestic, non-adapted
Details on inoculum:
no details are available
Duration of test (contact time):
14 d
Initial test substance concentration
Initial conc.:
100 mg/L
Based on:
not specified
Parameter followed for biodegradation estimationopen allclose all
Parameter followed for biodegradation estimation:
other: Biological oxygen demand
Parameter followed for biodegradation estimation:
TOC removal
Parameter followed for biodegradation estimation:
other: GC-Chromatography
Details on study design:
Only basic information is available on the study design:
Concentration of the substance: 100 ppm (= 100 mg/L)
Concentration of the activated sludge: 30 ppm (= 30 mg/L)
Duration: 2 weeks


Reference substance
Reference substance:
aniline

Results and discussion

Preliminary study:
-
Test performance:
-
% Degradationopen allclose all
Parameter:
other: Biological oxygen demand
Value:
80
Sampling time:
2 wk
Parameter:
% degradation (TOC removal)
Value:
93
Sampling time:
2 wk
Parameter:
other: GC Chromatography
Value:
100
Sampling time:
2 wk

Applicant's summary and conclusion

Validity criteria fulfilled:
not specified
Interpretation of results:
readily biodegradable
Conclusions:
On the basis of the available data Acetaldehyde could be considered as readily biodegradable.
Executive summary:

Acetaldehyde was investigated for ready biodegardability according to the Guideline OECD 301C (MITI-I) under the Chemical Substance Control Law of Japan. The study result indicated that the rate of degradation after 2 weeks was 80 % in biological oxygen demand (BOD) under the condition of 100 mg/L test substance and 30 mg/L of activated suludge. Acetaldehyde could thus be regarded as readily biodegradable.