trans-1,4-bis(iodomethyl)cyclohexane

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: GLP guideline study

Data source

Reference

Reference Type:

study report

Title:

Unnamed

Year:

2004

Report date:

2004

Materials and methods

Test guideline

Qualifier:

according to guideline

Guideline:

EU Method C.4-E (Determination of the "Ready" Biodegradability - Closed Bottle Test)

GLP compliance:

yes (incl. QA statement)

Test material

Test material information

Constituent 1

Reference substance name:

trans-1,4-bis(iodomethyl)cyclohexane

Cas Number:

83447-96-5

Molecular formula:

C8H14I2

IUPAC Name:

trans-1,4-bis(iodomethyl)cyclohexane

Study design

Oxygen conditions:

aerobic

Inoculum or test system:

sewage, domestic (adaptation not specified)

Duration of test (contact time):

28 d

Initial test substance concentration

Initial conc.:

6.7 mg/L

Based on:

test mat.

Reference substance

Reference substance:

other: sodium acetate anhydrous

Results and discussion

% Degradation

% Degradation 1

Parameter:

% degradation (O2 consumption)

Value:

0

Sampling time:

2 d

% Degradation 2

Parameter:

% degradation (O2 consumption)

Value:

0

Sampling time:

5 d

% Degradation 3

Parameter:

% degradation (O2 consumption)

Value:

1

Sampling time:

12 d

% Degradation 4

Parameter:

% degradation (O2 consumption)

Value:

0

Sampling time:

28 d

Details on results:

For the test item, no reduction of the O2 concentration was observed. Throughout the experiment not any O2 uptake were measured.
The degradation of the toxicity control showed about the same run as the procedure control indicating that the concentration of the test item had no inhibitory effect.

BOD5 / COD results

Results with reference substance:

The percentage degradation of the reference compound has reached the pass level of 60 per cent on day 5.
The residual concentration of oxygen did not fall below 0.5 mg/I.

Applicant's summary and conclusion

Conclusions:

In the present study not any oxygen uptake by the test item was measured. The pass level for ready biodegradation (60 per cent degradation) was notreached. For this reason in the test for ready biodegradability the test item seems to be not readily biodegradable.