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Environmental fate & pathways

Biodegradation in water and sediment: simulation tests

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Reference
Endpoint:
biodegradation in water and sediment: simulation tests
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
Justification for type of information:
Data is from computational model developed by USEPA
Qualifier:
according to
Guideline:
other: Modelling database
Principles of method if other than guideline:
Fugacity Model by EPI Suite estimation database
GLP compliance:
not specified
Radiolabelling:
not specified
Oxygen conditions:
other: estimation
Inoculum or test system:
not specified
Parameter followed for biodegradation estimation:
test mat. analysis
Reference substance:
not specified
Compartment:
other: water, material (mass) balance
% Recovery:
14.5
Remarks on result:
other: Other details not known
Compartment:
other: sediment, material (mass) balance
% Recovery:
0.826
Remarks on result:
other: Other details not known
% Degr.:
50
Parameter:
other: Half life
Sampling time:
60 d
Remarks on result:
other: 50% biodegradation in water ; 60 days = 1440 hrs.
% Degr.:
50
Parameter:
other: Half life
Sampling time:
541.66 d
Remarks on result:
other: 50% biodegradation in sediment ; 541.66 days = 13000 hrs.
Compartment:
water
DT50:
60 d
Type:
other: Estimation
Temp.:
25 °C
Remarks on result:
other: Other details not available
Compartment:
sediment
DT50:
541.66 d
Type:
other: Estimated
Temp.:
25 °C
Remarks on result:
other: Other details not available
Transformation products:
not specified
Evaporation of parent compound:
not specified
Volatile metabolites:
not specified
Residues:
not specified


 

Mass Amount (percent)

Half-Life (hr)

Emissions (kg/hr)

Water

14.5

1.44e+003

1000

Sediment

0.826

1.3e+004

0

 

Fugacity (atm)

Reaction (kg/hr)

Advection (kg/hr)

Reaction (percent)

Advection (percent)

Water

4.27e-017

341

709

11.4

23.6

Sediment

5.46e-017

2.16

0.809

0.0721

0.027

Validity criteria fulfilled:
not specified
Conclusions:
Estimated half life of test chemical 4(phenylazenyl)benzene-1,3-diamine in water was 60 days (1440 h) and in sediment estimated to be 541.66 days (1300 h).
Executive summary:

Estimation Programs Interface (EPI Suite, 2017) prediction model was run to predict the half-life in water and sediment for the test compound 4(phenylazenyl)benzene-1,3-diamine (CAS No. 495 -54 -5). If released in to the environment, 14.5% of the chemical will partition into water according to the Mackay fugacity model level III and the half-life period of 4(phenylazenyl)benzene-1,3 -diamine in water is estimated to be 60 days (1440 hrs). The half-life (60 days estimated by EPI suite) indicates that the chemical ispersistent in water and the exposure risk to aquatic animals ismoderate to high whereas the half-life period of 4(phenylazenyl)benzene-1,3-diamine in sediment is estimated to be 541.66 days (1300 hrs). However, as the percentage release of test chemical into the sediment is less than 1% (i.e, reported as 0.826%), indicates that 4(phenylazenyl)benzene-1,3-diamine is not persistent in sediment.

Description of key information

Estimated half life of test chemical 4(phenylazenyl)benzene-1,3-diamine in water was 60 days (1440 h) and in sediment estimated to be 541.66 days (1300 h).

Key value for chemical safety assessment

Half-life in freshwater:
60 d
at the temperature of:
25 °C
Half-life in freshwater sediment:
541.66 d
at the temperature of:
25 °C

Additional information

Estimation Programs Interface (EPI Suite, 2017) prediction model was run to predict the half-life in water and sediment for the test compound 4(phenylazenyl)benzene-1,3-diamine (CAS No. 495 -54 -5). If released in to the environment, 14.5% of the chemical will partition into water according to the Mackay fugacity model level III and the half-life period of 4(phenylazenyl)benzene-1,3 -diamine in water is estimated to be 60 days (1440 hrs). The half-life (60 days estimated by EPI suite) indicates that the chemical is persistent in water and the exposure risk to aquatic animals ismoderate to high whereas the half-life period of 4(phenylazenyl)benzene-1,3-diamine in sediment is estimated to be 541.66 days (1300 hrs). However, as the percentage release of test chemical into the sediment is less than 1% (i.e, reported as 0.826%), indicates that 4(phenylazenyl)benzene-1,3-diamine is not persistent in sediment.