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EC number: 200-589-6 | CAS number: 64-67-5
Biodegradation in water: screening tests
Administrative data
- Endpoint:
- biodegradation in water: ready biodegradability
- Type of information:
- experimental study
- Adequacy of study:
- other information
- Study period:
- 01-DEC-1977 to 10-APR-1978
- Reliability:
- 2 (reliable with restrictions)
- Rationale for reliability incl. deficiencies:
- other: Old study but performed by the Japanese Authorities according to national guidelines
Data source
Reference
- Reference Type:
- other: CERI website
- Title:
- Diethyl sulfate
- Author:
- Anonymous
- Bibliographic source:
- CERI website
Materials and methods
Test guideline
- Qualifier:
- according to guideline
- Guideline:
- other: Japanese guideline before OECD harmonisation
- GLP compliance:
- not specified
Test material
- Reference substance name:
- Diethyl sulphate
- EC Number:
- 200-589-6
- EC Name:
- Diethyl sulphate
- Cas Number:
- 64-67-5
- Molecular formula:
- C4H10O4S
- IUPAC Name:
- diethyl sulfate
- Details on test material:
- purity: 99%
Impurities and water < 0.15%
Constituent 1
Study design
- Oxygen conditions:
- aerobic
- Inoculum or test system:
- activated sludge (adaptation not specified)
- Duration of test (contact time):
- 4 wk
Initial test substance concentration
- Initial conc.:
- 100 mg/L
- Based on:
- not specified
Results and discussion
% Degradationopen allclose all
- Parameter:
- % degradation (TOC removal)
- Value:
- 51.2
- Sampling time:
- 28 d
- Parameter:
- % degradation (TOC removal)
- Value:
- 95.9
- Sampling time:
- 28 d
- Parameter:
- other: BOD
- Value:
- 49.1
- Sampling time:
- 28 d
- Parameter:
- other: BOD
- Value:
- 89.1
- Sampling time:
- 28 d
- Details on results:
- No mean was calculated because the results of the 2 replicates are very different.
Preliminary test:
after 24h, no residue of DES was found in the water or in the sludge.
Based on TOC analysis, the recovery was 99% in water and 95 % in the sludge.
GC analysis shows that ethanol was a degradation product.
Main test results:
Based on the results of TOC, BOD and GC analysis, the following reaction is supposed to occur:
(C2H5O)2 SO2 ---> H2O + C2H5OSO3H + C2H5OH ---> H2O + H2SO4 + 2(C2H5OH)
Hydrolysis plays a role in this degradation.
Applicant's summary and conclusion
- Validity criteria fulfilled:
- not specified
- Remarks:
- the validity criteria of the guideline used are unknown
- Interpretation of results:
- other: Quickly biodegraded but no data about the 10-day window. Abiotic degradation is also included
- Conclusions:
- Quickly biodegraded but no data about the 10-day window. Abiotic degradation is also included.
- Executive summary:
The Japanese Authorities performed a study of biodegradation of DES with activated sludge.
Results show that DES is quickly biodegraded but no data is given about the 10-day window. Abiotic degradation is also included.
Ethanol was quantified as a degradation product.
The results of the 2 replicates are rather different.
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