3,9-dimethyl-2,4,8,10-tetraoxa-3,9-diphosphaspiro[5.5]undecane 3,9-dioxide

Biodegradation in water: screening tests

Link to relevant study record(s)

Reference

Endpoint:

biodegradation in water: ready biodegradability

Type of information:

experimental study

Adequacy of study:

key study

Study period:

2016-03-19 till 2016-04-15

Reliability:

2 (reliable with restrictions)

Rationale for reliability incl. deficiencies:

guideline study

Remarks:

without GLP

Qualifier:

according to guideline

Guideline:

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

Version / remarks:

adopted July 17, 1992

GLP compliance:

no

Remarks:

The substance is known to be not readily biodegradable. Therefore a non-GLP study was adequate to prove the poor biodegradability.

Oxygen conditions:

aerobic

Inoculum or test system:

activated sludge, domestic, non-adapted

Duration of test (contact time):

28 d

Initial conc.:

41 mg/L

Based on:

test mat.

Preliminary study:

Result of the preliminary study:
The biodegradation of the test item (2 replicates) does not reach the 10 % level (beginning of biodegradation) until test end. The mean biodegradation on day 28 was 6 %.

Key result

Parameter:

other: BOD

Value:

ca. 6

Sampling time:

28 d

Remarks on result:

other: not readily biodegradable

Details on results:

not readily biodegradable

Results with reference substance:

no reference substance used for limit test

Validity criteria fulfilled:

yes

Interpretation of results:

not readily biodegradable

Conclusions:

The test item is classified as not readily biodegradable within 28 days.

Description of key information

not readily biodegradable

Key value for chemical safety assessment

Biodegradation in water:

under test conditions no biodegradation observed

Type of water:

freshwater