3,6,7-trimethyloct-6-en-1-yn-3-ol

Biodegradation in water: screening tests

Administrative data

Endpoint:

biodegradation in water: ready biodegradability

Type of information:

experimental study

Adequacy of study:

key study

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

other: study performed according to OECD and GLP guidelines.

Cross-reference

Reason / purpose for cross-reference:

reference to other study

Data source

Reference

Reference Type:

study report

Title:

Unnamed

Year:

2007

Report date:

2007

Materials and methods

Test guideline

Qualifier:

according to guideline

Guideline:

OECD Guideline 301 A (Ready Biodegradability: DOC Die Away Test)

Deviations:

no

GLP compliance:

yes (incl. QA statement)

Test material

Test material information

Constituent 1

Reference substance name:

3,6,7-trimethyloct-6-en-1-yn-3-ol

EC Number:

258-011-3

EC Name:

3,6,7-trimethyloct-6-en-1-yn-3-ol

Cas Number:

52567-96-1

Molecular formula:

C11H18O

IUPAC Name:

3,6,7-trimethyloct-6-en-1-yn-3-ol

Study design

Oxygen conditions:

aerobic

Inoculum or test system:

activated sludge, domestic (adaptation not specified)

Duration of test (contact time):

ca. 28 d

Initial test substance concentration

Initial conc.:

ca. 28 mg/L

Based on:

DOC

Results and discussion

% Degradation

Parameter:

% degradation (DOC removal)

Value:

ca. 63

Sampling time:

28 d

Details on results:

-

Any other information on results incl. tables

-

Applicant's summary and conclusion

Validity criteria fulfilled:

yes

Interpretation of results:

readily biodegradable, but failing 10-day window

Conclusions:

The mean biodegradation of Methyldehydrolinalool technical, based on DOC decrease, amounted to 63%. Therefore,
Methyldehydrolinalool technical was found to be biodegradable under the test conditions over the 28-day exposure to activated sludge. However, the pass level for ready biodegradability, i.e. biodegradation of at least 70% removal of DOC in a 10-day window
within the 28-day period of the test, was not reached.

Executive summary:

In the test flasks, containing the test item Methyldehydrolinalool technical and activated sludge (inoculum), the mean concentration of dissolved organic carbon (DOC) continuously decreased by 63% of the initial value within the test period of 28 days. Therefore, Methyldehydrolinalool technical was found to be biodegradable under the test conditions. However, the pass level for ready biodegradability, i.e. at least 70% removal of DOC in a 10-day window within the 28-day period of the test was not reached. The reference item sodium benzoate was completely biodegraded (100%) within two days of exposure, thus confirming suitability of the activated sludge. In the toxicity control, containing the test item, the reference item sodium benzoate and activated sludge (inoculum), the initial DOC decreased by 97% within 14 days of exposure. Thus, according to the test guidelines, the test item was not inhibitory to activated sludge at the tested concentration of 40 mg/L because degradation was >35% within 14 days.