2,2'-phenyliminodiethanol

Biodegradation in water: screening tests

Link to relevant study record(s)

Reference

Reference 1

Endpoint:

biodegradation in water: ready biodegradability

Type of information:

(Q)SAR

Adequacy of study:

key study

Reliability:

2 (reliable with restrictions)

Rationale for reliability incl. deficiencies:

results derived from a valid (Q)SAR model and falling into its applicability domain, with adequate and reliable documentation / justification

Justification for type of information:

1. SOFTWARE
OASIS Catalogic v5.14.1.5

2. MODEL (incl. version number)
CATALOGIC 301C v11.16

3. SMILES OR OTHER IDENTIFIERS USED AS INPUT FOR THE MODEL
See section 'Test Material'.

4. SCIENTIFIC VALIDITY OF THE (Q)SAR MODEL
See attached QMRF.

5. APPLICABILITY DOMAIN
See attached QPRF.

6. ADEQUACY OF THE RESULT
- The model is scientifically valid (see attached QMRF).
- The model estimates the biodegradability of a substance Screening information on the ready biodegradability is required for substances manufactured or imported in quantities of 1 t/y or more. Depending on the results, further information may be required for substances manufactured or imported in quantities of 100 t/y or more (simulation testing on ultimate degradation in surface water/soil/sediment). Column 2 of REACH Annex VII provides exemptions for conducting the study. It does not need to be conducted if the substance is inorganic. According to column 2 of REACH Annex IX, testing is not required if the substance is highly insoluble in water, or the substance is readily biodegradable.
- See attached QPRF for reliability assessment.

Principles of method if other than guideline:

Estimation of ready biodegradation in water using CATALOGIC v5.14.1.5 BOD 28 days MITI (OECD 301C) v11.16

GLP compliance:

no

Oxygen conditions:

aerobic

Inoculum or test system:

other: model calculation

Duration of test (contact time):

28 d

Parameter:

% degradation (O2 consumption)

Value:

3

Sampling time:

28 d

-Concomitant predictions:

Not ready degradable

Primary Half Life = 3 months and 6 days

Ultimae Half Life = 1 year 6 months 2 days

- Predicted value (model result): O2 -consumption (BOD) = 0.03 ± 0.0468

Interpretation of results:

not readily biodegradable

Remarks:

according to OECD criteria

Reference 2

Endpoint:

biodegradation in water: ready biodegradability

Type of information:

(Q)SAR

Adequacy of study:

key study

Reliability:

2 (reliable with restrictions)

Rationale for reliability incl. deficiencies:

results derived from a valid (Q)SAR model, but not (completely) falling into its applicability domain, with adequate and reliable documentation / justification

Justification for type of information:

1. SOFTWARE
OASIS Catalogic v5.14.1.5

2. MODEL (incl. version number)
CATALOGIC Kinetic 301F v14.17

3. SMILES OR OTHER IDENTIFIERS USED AS INPUT FOR THE MODEL
See section 'Test Material'.

4. SCIENTIFIC VALIDITY OF THE (Q)SAR MODEL
See attached QMRF.

5. APPLICABILITY DOMAIN
See attached QPRF.

6. ADEQUACY OF THE RESULT
- The model is scientifically valid (see attached QMRF).
- The model estimates the biodegradability of a substance Screening information on the ready biodegradability is required for substances manufactured or imported in quantities of 1 t/y or more. Depending on the results, further information may be required for substances manufactured or imported in quantities of 100 t/y or more (simulation testing on ultimate degradation in surface water/soil/sediment). Column 2 of REACH Annex VII provides exemptions for conducting the study. It does not need to be conducted if the substance is inorganic. According to column 2 of REACH Annex IX, testing is not required if the substance is highly insoluble in water, or the substance is readily biodegradable.
- See attached QPRF for reliability assessment.

Principles of method if other than guideline:

Estimation of ready biodegradation in water using CATALOGIC v5.13.1, CATALOGIC Kinetic 301F v13.16:
The Endpoint is Biological Oxygen Demand (BOD) according to OECD 301F. BOD is the oxygen used by aerobic microorganisms to mineralize the test substance after a given time (28 days), corrected for oxygen uptake by the blank inoculum control after the same time, and related to the theoretical oxygen demand needed for full mineralization of the substance.

GLP compliance:

no

Oxygen conditions:

aerobic

Inoculum or test system:

other: Model calculation

Duration of test (contact time):

28 d

Parameter:

% degradation (O2 consumption)

Value:

16

Sampling time:

28 d

- Concomitant predictions :

Not ready degradable

Primary Half Life = 29.21 days

Ultimate Half Life = 3 months 21 days

Start day of Calc. 10 days window => 22

BOD calculated at 10 days window = 0.1956

Classification of Calc. 10 days window = not ready

- Predicted value (model result): BOD (28 days) = 0.16 ± 0.690

 

Interpretation of results:

not readily biodegradable

Description of key information

Not readily biodegradable (according to OECD criteria).

Key value for chemical safety assessment

Biodegradation in water:

not biodegradable

Type of water:

freshwater

Additional information

The biodegradability of 2,2'-phenyliminodiethanol was estimated using several estimation models:

- Catalogic v5.14.1.5, OECD 301C v11.16:

The model predicted the substance to be not readily biodegradable. Based on O2-consumption (BOD), the model estimated 3% biodegradation after 28 days; the primary half-life was calculated to 3 months and 6 days. The substance is 100% within the applicability domain of the model .

- Catalogic v5.14.1.5, Kinetic 301F v14.17:

The model predicted the substance to be not readily biodegradable. Based on BOD, the model estimated 16% biodegradation after 28 days; the primary half-life was calculated to be 29.21 days. The substance is 100% within the applicability domain of the model. 

 

Based on the available estimated data, it can be concluded that the substance is not readily biodegradable (according to OECD criteria).