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Biodegradation in water and sediment: simulation tests

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Reference
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
Justification for type of information:
Data is from computational model developed by USEPA
Qualifier:
no guideline available
Principles of method if other than guideline:
Fugacity Model by EPI Suite estimation database
GLP compliance:
not specified
Specific details on test material used for the study:
CAS number: 842-07-9
EC number: 212-668-2
- Name of test material (as cited in study report): 2-Naphthalenol, 1-(phenylazo)-
- Molecular formula (if other than submission substance): C16H12N2O
- Molecular weight (if other than submission substance): 248.284 g/mol
- Smiles notation (if other than submission substance): c12c(\N=N\c3ccccc3)c(ccc1cccc2)O
- InChI: 1S/C16H12N2O/c19-15-11-10-12-6-4-5-9-14(12)16(15)18-17-13-7-2-1-3-8-13/h1-11,19H/b18-17+
- Substance type: Organic
- Physical state: Solid
Radiolabelling:
not specified
Oxygen conditions:
other: estimation
Inoculum or test system:
not specified
Parameter followed for biodegradation estimation:
other: calculated data
Compartment:
water
% Recovery:
7.59
Remarks on result:
other: Other details not known
Compartment:
sediment
% Recovery:
22
Remarks on result:
other: Other details not known
Key result
% Degr.:
50
Parameter:
other: Half-life in water
Sampling time:
37.5 d
Remarks on result:
other: Other details not known
Key result
% Degr.:
50
Parameter:
other: Half-life in sediment
Sampling time:
337.5 d
Remarks on result:
other: Other details not known
Key result
Compartment:
water
DT50:
37.5 d
Type:
other: estimated data
Temp.:
25 °C
Remarks on result:
other: Other details not known
Key result
Compartment:
sediment
DT50:
337.5 d
Type:
other: estimated data
Temp.:
25 °C
Remarks on result:
other: Other details not known
Transformation products:
not specified

Mass Amount

(percent)

Half-Life (hr)

Emissions (kg/hr)

Water

7.59

900

1000

Sediment

22

8.1e+003

0

 

Fugacity (atm)

Reaction (kg/hr)

Advection (kg/hr)

Reaction (percent)

Advection (percent)

Water

1.28e-015

408

530

13.6

17.7

Sediment

1.58e-015

131

30.7

4.38

1.02
Validity criteria fulfilled:
not specified
Conclusions:
Estimated half life of 1-phenylazo-2-naphthol (C.I. Solvent Yellow 14) in water was 37.5 days (900 h) and in sediment estimated to be 337.5 days (8100 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 1-phenylazo- 2-naphthol (C.I. Solvent Yellow 14) (CAS No. 842 -07 -9). If released in to the environment,7.59% of the chemical will partition into water according to the Mackay fugacity model level III and the half-life period of C.I. Solvent Yellow 14 in water is estimated to be 37.5 days (900 hrs). The half-life (37.5 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 C.I. Solvent Yellow 14 in sediment is estimated to be 337.5 days (8100 hrs). Based on this half-life value (337.5 days), it indicates that the chemical 1-phenylazo-2-naphthol (C.I. Solvent Yellow 14) is persistent in sediment.

Description of key information

Estimation Programs Interface (EPI) Suite (2017) prediction model was run to predict the half-life in water and sediment for the test compound 1-phenylazo- 2-naphthol (C.I. Solvent Yellow 14) (CAS No. 842 -07 -9). If released in to the environment,7.59% of the chemical will partition into water according to the Mackay fugacity model level III and the half-life period of C.I. Solvent Yellow 14 in water is estimated to be 37.5 days (900 hrs). The half-life (37.5 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 C.I. Solvent Yellow 14 in sediment is estimated to be 337.5 days (8100 hrs). Based on this half-life value (337.5 days), it indicates that the chemical 1-phenylazo-2- naphthol (C.I. Solvent Yellow 14) is persistent in sediment.

Key value for chemical safety assessment

Half-life in freshwater:
37.5 d
at the temperature of:
25 °C
Half-life in freshwater sediment:
337.5 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 1-phenylazo- 2-naphthol (C.I. Solvent Yellow 14) (CAS No. 842 -07 -9). If released in to the environment,7.59% of the chemical will partition into water according to the Mackay fugacity model level III and the half-life period of C.I. Solvent Yellow 14 in water is estimated to be 37.5 days (900 hrs). The half-life (37.5 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 C.I. Solvent Yellow 14 in sediment is estimated to be 337.5 days (8100 hrs). Based on this half-life value (337.5 days), it indicates that the chemical 1-phenylazo- 2-naphthol (C.I. Solvent Yellow 14) is persistent in sediment.