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Environmental fate & pathways

Biodegradation in water and sediment: simulation tests

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Endpoint:
biodegradation in water: simulation testing on ultimate degradation in surface water
Type of information:
calculation (if not (Q)SAR)
Adequacy of study:
key study
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
accepted calculation method
Qualifier:
according to guideline
Guideline:
other: Modelling database
Principles of method if other than guideline:
PBT profiler database
GLP compliance:
no
Radiolabelling:
no
Oxygen conditions:
other: estimated database
Compartment:
water
% Recovery:
18
Remarks on result:
other: Other details not known
Key result
% Degr.:
50
Parameter:
other: half-life in water
Sampling time:
15 d
Remarks on result:
other: Other details not known
Key result
Compartment:
water
DT50:
15 d
Type:
other: Estimation
Temp.:
25 °C
Remarks on result:
other: Other details not known
Transformation products:
not specified
Evaporation of parent compound:
not specified
Volatile metabolites:
not specified
Residues:
not specified

Media

Half-Life 
(days)

Percent in
Each Medium

Water

15

 18 %
Validity criteria fulfilled:
not specified
Conclusions:
Estimated half life of test chemical in water was 15 days.
Executive summary:

Level III Fugacity prediction model was run to predict the half-life in water for the test chemical. If released in to the environment, 18% of the chemical will partition into water according to the Mackay fugacity model level III and the half-life period of test chemical in water is estimated to be 15 days. The half-life (15 days estimated by EPI suite) indicates that the chemical is not persistent in water and the exposure risk to aquatic animals is moderate to low.

Endpoint:
biodegradation in water: sediment simulation testing
Type of information:
calculation (if not (Q)SAR)
Adequacy of study:
key study
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
accepted calculation method
Qualifier:
according to guideline
Guideline:
other: Modelling database
Principles of method if other than guideline:
PBT profiler database
GLP compliance:
no
Radiolabelling:
no
Oxygen conditions:
other: estimated database
Compartment:
sediment
% Recovery:
9
Remarks on result:
other: Other details not known
Key result
% Degr.:
50
Parameter:
other: half-life in sediment
Sampling time:
140 d
Remarks on result:
other: Other details not known
Key result
Compartment:
sediment
DT50:
140 d
Type:
other: Estimation
Temp.:
25 °C
Remarks on result:
other: Other details not known
Transformation products:
not specified
Evaporation of parent compound:
not specified
Volatile metabolites:
not specified
Residues:
not specified

Media

Half-Life 
(days)

Percent in
Each Medium

Sediment

140

 9 %
Validity criteria fulfilled:
not specified
Conclusions:
Estimated half life of test chemical in sediment was 140 days.
Executive summary:

Level III Fugacity prediction model was run to predict the half-life in sediment for the test chemical. The half-life period of test chemical in sediment is estimated to be 140 days. However, as the percentage release of test chemical into the sediment is less than 10% (i.e, reported as 9%), indicates that test chemical is not persistent in sediment.

 

Description of key information

Level III Fugacity prediction model was run to predict the half-life in water and sediment for the test chemical. If released in to the environment, 18% of the chemical will partition into water according to the Mackay fugacity model level III and the half-life period of test chemical in water is estimated to be 15 days. The half-life (15 days estimated by EPI suite) indicates that the chemical is not persistent in water and the exposure risk to aquatic animals is moderate to low whereas the half-life period of test chemical in sediment is estimated to be 140 days. However, as the percentage release of test chemical into the sediment is less than 10% (i.e, reported as 9%), indicates that test chemical is not persistent in sediment.

 

Key value for chemical safety assessment

Half-life in freshwater:
15 d
at the temperature of:
25 °C
Half-life in freshwater sediment:
140 d
at the temperature of:
25 °C

Additional information

Level III Fugacity prediction model was run to predict the half-life in water and sediment for the test chemical. If released in to the environment, 18% of the chemical will partition into water according to the Mackay fugacity model level III and the half-life period of test chemical in water is estimated to be 15 days. The half-life (15 days estimated by EPI suite) indicates that the chemical is not persistent in water and the exposure risk to aquatic animals is moderate to low whereas the half-life period of test chemical in sediment is estimated to be 140 days. However, as the percentage release of test chemical into the sediment is less than 10% (i.e, reported as 9%), indicates that test chemical is not persistent in sediment.