α-trimethylsilanyl-ω-trimethylsiloxypoly[oxy(methyl-3-(2-(2-methoxypropoxy)propoxy)propylsilanediyl]-co-oxy(dimethylsilane))

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:

8 January - April 22, 1991

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

other: GLP study

Data source

Reference

Reference Type:

study report

Title:

Unnamed

Year:

1991

Report date:

1991

Materials and methods

Test guideline

Test guideline 1

Qualifier:

according to guideline

Guideline:

OECD Guideline 301 B (Ready Biodegradability: CO2 Evolution Test)

Test guideline 2

Qualifier:

according to guideline

Guideline:

other: EEC dir. 84/449, Part C: Methods for the determination of ecotoxicity, Publication No. L251, C5: "Biodegradation: modified Sturm test" , adopted Sep. 1984

GLP compliance:

yes

Test material

Test material information

Constituent 1

Reference substance name:

α-trimethylsilanyl-ω-trimethylsiloxypoly[oxy(methyl-3-(2-(2-methoxypropoxy)propoxy)propylsilanediyl]-co-oxy(dimethylsilane))

EC Number:

406-420-4

EC Name:

α-trimethylsilanyl-ω-trimethylsiloxypoly[oxy(methyl-3-(2-(2-methoxypropoxy)propoxy)propylsilanediyl]-co-oxy(dimethylsilane))

Cas Number:

69430-40-6

Molecular formula:

Unspecified example: C18.3H46.8O5.8Si4.1

IUPAC Name:

2,2,4,4,6,12,15-heptamethyl-6-[(trimethylsilyl)oxy]-3,5,10,13,16-pentaoxa-2,4,6-trisilaheptadecane

Details on test material:

- Name of test material (as cited in study report): DC 5067
- Substance type: Reaction mass (mixture)
- Physical state: Liquid
- Analytical purity: > 99%
- Lot/batch No.: AB 090122
- Expiration date of the lot/batch: December 1, 1991
- Stability under test conditions: Stable
- Storage condition of test material: In the original container at room temperature in the dark
- Other:

Study design

Oxygen conditions:

aerobic

Inoculum or test system:

activated sludge (adaptation not specified)

Duration of test (contact time):

28 d

Initial test substance concentration

Initial test substance concentration 1

Initial conc.:

10 mg/L

Based on:

test mat.

Initial test substance concentration 2

Initial conc.:

20 mg/L

Based on:

test mat.

Results and discussion

% Degradation

% Degradation 1

Parameter:

% degradation (CO2 evolution)

Value:

34

Sampling time:

1 d

Remarks on result:

other: first 10 days, then every 5th day

% Degradation 2

Parameter:

% degradation (CO2 evolution)

Value:

39

Sampling time:

1 d

Remarks on result:

other: first 10 days, then every 5th day

Details on results:

see table above (section: Any other information on materials and methods incl. tables)

Applicant's summary and conclusion

Validity criteria fulfilled:

yes

Interpretation of results:

readily biodegradable, but failing 10-day window

Conclusions:

DC 5067 was degraded significantly during the test period . However, since at least 60% biodegradation was not reached within ten days of
biodegradation exceeding 10%, the criteria for ready biodegradability were not met. Thus, under the conditions of this test DC 5067 was not
readily biodegradable.

Executive summary:

DC 5067 was tested for its ready biodegradability in the modified Sturm test at nominal concentrations of 10 and 20 mg/l.

The relative degradation values calculated from the measurements performed during the test period of 28 days revealed that at both concentrations DC 5067 was degraded significantly: 34% and 39% for 10 and 20 mg/l respectively. However,

since at least 60% biodegradation was not reached within 10 days of biodegradation exceeding 10%, the criteria for ready biodegradability were not met. Thus under the conditions of this test, DC 5067 was not readily biodegradable.

Under the same conditions sodium acetate was degraded by more than 60%.