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EC number: 640-964-5 | CAS number: 218451-68-4
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:
- 08/1996-01/1997
- Reliability:
- 2 (reliable with restrictions)
- Rationale for reliability incl. deficiencies:
- guideline study with acceptable restrictions
Data source
Reference
- Reference Type:
- study report
- Title:
- Unnamed
- Year:
- 1 997
- Report date:
- 1997
Materials and methods
Test guideline
- Qualifier:
- according to guideline
- Guideline:
- EU Method C.4-C (Determination of the "Ready" Biodegradability - Carbon Dioxide Evolution Test)
- GLP compliance:
- yes
Test material
- Reference substance name:
- Reaction products of coconut oil with polyethyleneglycol and 2-ethyl-2-(hydroxymethyl)propane-1,3-diol
- EC Number:
- 640-964-5
- Cas Number:
- 218451-68-4
- Molecular formula:
- not applicable because UVCB
- IUPAC Name:
- Reaction products of coconut oil with polyethyleneglycol and 2-ethyl-2-(hydroxymethyl)propane-1,3-diol
- Reference substance name:
- Coconut oil, reaction product with polyethylene glycol and trimethylolpropane
- IUPAC Name:
- Coconut oil, reaction product with polyethylene glycol and trimethylolpropane
- Details on test material:
- - Name of test material (as cited in study report): Marlowet 4753
- Physical state: liquid, cristalline
- Analytical purity: 98.4 %
- Impurities (identity and concentrations): not mentioned
- Stability under test conditions: > 1 year
Constituent 1
Constituent 2
Study design
- Oxygen conditions:
- aerobic
- Inoculum or test system:
- activated sludge, domestic, non-adapted
- Details on inoculum:
- - Source of inoculum/activated sludge: domestic sewage plant (Marl-East, Germany)
- Laboratory culture: no
- Storage conditions: not mentioned
- Storage length: not mentioned
- Preparation of inoculum for exposure: according to prescipt (not specified)
- Pretreatment: not mentioned
- Concentration of sludge: 28.1 mg/L suspended solids; dry weight of inoculum: 4.2 g/L
- Initial cell/biomass concentration: 56 x 10000 cfu/mL (colony forming units/mL)
- Water filtered: not mentioned - Duration of test (contact time):
- 29 d
Parameter followed for biodegradation estimation
- Parameter followed for biodegradation estimation:
- CO2 evolution
- Details on study design:
- TEST CONDITIONS
- Composition of medium: not specified
- Additional substrate: none
- Solubilising agent (type and concentration if used): not used
- Test temperature: . . °C
- pH:
- pH adjusted: no
- Aeration of dilution water: not specified
- Suspended solids concentration: . . mg/L
- Continuous darkness: not mentioned
- Other: none
TEST SYSTEM
- Culturing apparatus: 5000 mL glass vessels containing culture samples
- Number of culture flasks/concentration: 2 bottles, one concentration
- Method used to create aerobic conditions: not mentioned
- Method used to create anaerobic conditions: not applicable
- Measuring equipment: carbon analyzer (Shimadzu)
- Details of trap for CO2: collection of carbon dioxide as sodium carbonate with sodium hydroxide solution (no further details mentioned)
- Other: none
SAMPLING
- Sampling frequency: on days 0, 1, 6, 9, 14, 19, 23, 28 and 29
- Sampling method: not mentioned
- Sample storage before analysis: not mentioned
- Other: none
CONTROL AND BLANK SYSTEM
- Inoculum blank: yes (2 vessels with inoculum without test substance)
- Abiotic sterile control: not performed
- Toxicity control: not performed
- Other: none
STATISTICAL METHODS: no statistics performed
Reference substance
- Reference substance:
- benzoic acid, sodium salt
- Remarks:
- 25 mg/L final test medium (14.6 mg DOC/L)
Results and discussion
- Preliminary study:
- not performed
- Test performance:
- Procedure: The test substance was poured into a defined, liquid mineral medium, which was inoculated with an inoculum from activated sludge and aerated at .20.4. °C (17.7 - 22 °C). The released CO2 is bound in caustic soda solution in the form of sodium carbonate. The degradation was followed over the duration of the test of 29 days at the days 0, 2, 5, 9, 12, 16, 19, 23, 28 and 29 d of sampling as stated above via a TIC analysis (total inorganic carbon) of the bound CO2 with a carbon analyzer of Shimadzu. One day before the end of the test (28th day) a pH-measurement was conducted and the remaining dissolved CO2 was driven out by acidification of the test preparation, the degradation values ascertained on the 29th day (end of incubation) are therefore related to the 28th day.
Preparation of the mineral medium: Two days before the beginning of the test (addition of the test substance) 35 L of the mineral medium were prepared and erated overnight. On the following day 2400 mL were filled into the individual test containers and, after inoculation with the inolculum, filled with the mineral medium up to 3 L.
Dosage of the test material: The test material was weighed exactly by means of a weighing aid (reaction vessel from Eppendorf, cut-off cover) and was put into the test vessels together with the weighing aid.
% Degradation
- Key result
- Parameter:
- % degradation (CO2 evolution)
- Value:
- ca. 79
- Sampling time:
- 28 d
- Remarks on result:
- other: after acification
- Details on results:
- see below
BOD5 / COD results
- Results with reference substance:
- see below
Any other information on results incl. tables
Table: Degradation kinetic
| sampling time [days] | degradation [%] | |||
| test substance | reference substance | |||
| vessel 1 | vessel 2 | mean | ||
| 1 | -1 | -1 | -1 | -1 |
| 2 | 13 | 16 | 15 | 4 |
| 5 | 33 | 38 | 36 | 74 |
| 9 | 61 | 64 | 63 | 78 |
| 12 | 65 | 70 | 68 | 78 |
| 16 | 66 | 69 | 68 | 74 |
| 19 | 79 | 76 | 78 | 85 |
| 23 | 79 | 80 | 80 | 86 |
| 28 | 79 | 80 | 80 | 88 |
| 29 (after acidification) | 80 | 78 | 79 | 86 |
Applicant's summary and conclusion
- Validity criteria fulfilled:
- yes
- Interpretation of results:
- readily biodegradable
- Executive summary:
The purpose of this test was the measurement of the biodegradability of Coconut oil, reaction product with polyethylene glycol and trimethylolpropane in an aerobic, aqueous medium. The study was conducted according to the EU Method C.4 -C (Determination of the "Ready Biodegradabality - Carbon Dioxide Evolution test).
Under the present test conditions, 79 % biodegradability was determined for Coconut oil, reaction product with polyethylene glycol and trimethylolpropane after 28 days. The substance reached the 10d-window (>= 60 % were degradated during 10 days).
Coconut oil, reaction product with polyethylene glycol and trimethylolpropane is regarded as "readily biodegradable".
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