1,4-bis(alkenyl(dialkyl)siliyl)heteromonocycle

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: Conducted at GLP-accredited facility to current guidelines

Data source

Reference

Reference Type:

study report

Title:

Unnamed

Year:

2017

Report date:

2017

Materials and methods

Test guideline

Qualifier:

according to guideline

Guideline:

OECD Guideline 301 F (Ready Biodegradability: Manometric Respirometry Test)

Deviations:

no

GLP compliance:

yes (incl. QA statement)

Test material

Test material information

Constituent 1

Test material form:

liquid

Study design

Inoculum or test system:

activated sludge, domestic (adaptation not specified)

Details on inoculum:

Activated sludge from the municipal wastewater treatment plant Breisgauer Bucht (Forchheim, Germany) was used as inoculum with a concentration corresponding to 30 mg dry solids per litre. The treatment plant clarifies predominantly domestic wastewater of the region of Freiburg and has a capacity of 600.000 inhabitant equivalents. Sampling date of activated sludge was 2 November 2016. Dry solid of the activated sludge was determined as 3.9 g/L by weight measurements after 3 h drying at 105 °C (mean of triplicate measurements). The activated sludge was washed twice with tap water by settling the sludge, decanting the supernatant and re-suspending the sludge.

Duration of test (contact time):

28 d

Initial test substance concentration

Initial conc.:

>= 97.8 - <= 99.4 mg/L

Based on:

ThOD

Parameter followed for biodegradation estimation

Parameter followed for biodegradation estimation:

CO2 evolution

Reference substance

Reference substance:

acetic acid, sodium salt

Results and discussion

% Degradation

Key result

Parameter:

% degradation (CO2 evolution)

Value:

ca. 3.8

Sampling time:

28 d

Applicant's summary and conclusion

Validity criteria fulfilled:

yes

Interpretation of results:

not readily biodegradable

Conclusions:

The degradation extent of the test item at the end of the test was -3.8% (mean of three replicates).
The criterion for ready biodegradation was not met (degradation ≥ 60% and fulfilment of 10-d-window) therefore the test item is not ready biodegradable according to the OECD criteria.

Executive summary:

The degradation extent of the test item at the end of the test was -3.8% (mean of three replicates).

The criterion for ready biodegradation was not met (degradation ≥ 60% and fulfilment of 10-d-window) therefore the test item is not ready biodegradable according to the OECD criteria.