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Environmental fate & pathways

Biodegradation in water and sediment: simulation tests

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Administrative data

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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
Guideline:
other: Modeling database
Principles of method if other than guideline:
Fugacity Model by EPI Suite estimation database
GLP compliance:
no
Radiolabelling:
no
Oxygen conditions:
other: estimation
Inoculum or test system:
not specified
Compartment:
other: water, material (mass) balance
% Recovery:
1.3
Compartment:
other: sediment, material (mass) balance
% Recovery:
55.6
Key result
% Degr.:
50
Parameter:
other: Half life in water
Sampling time:
60 d
Key result
% Degr.:
50
Parameter:
other: Half-life in sediment
Sampling time:
541.66 d
Compartment:
water
DT50:
60 d
Type:
other: estimation
Temp.:
25 °C
Remarks on result:
other: 60 days = 1440 hr
Compartment:
sediment
DT50:
541.66 d
Type:
other: estimation
Temp.:
25 °C
Remarks on result:
other: 541.66 days = 13000 hr
Transformation products:
not specified
Validity criteria fulfilled:
not specified
Conclusions:
Half-life period of Disodium 4,4’-(2,4-dihydroxy-5- hydroxymethyl-1,3-phenylene bis-azo) di- (naphthalene-1-sulfonate), in water is observed to be 60 days (1440 hrs.) while in sediment it is 541.66 days (13000 hrs). Based on these half-life values of Disodium 4,4’-(2,4-dihydroxy-5- hydroxymethyl-1,3-phenylene bis-azo) di- (naphthalene-1-sulfonate), it is concluded that the chemical is persistent in water and sediment.
Executive summary:

Half-life period of Disodium 4,4’-(2,4-dihydroxy-5- hydroxymethyl-1,3-phenylene bis-azo) di- (naphthalene-1-sulfonate), in water is observed to be 60 days (1440 hrs.) while in sediment it is 541.66 days (13000 hrs). Based on these half-life values of Disodium 4,4’-(2,4-dihydroxy-5- hydroxymethyl-1,3-phenylene bis-azo) di- (naphthalene-1-sulfonate), it is concluded that the chemical is persistent in water and sediment.

Description of key information

Half-life period of Disodium 4,4’-(2,4-dihydroxy-5- hydroxymethyl-1,3-phenylene bis-azo) di- (naphthalene-1-sulfonate), in water is observed to be 60 days (1440 hrs.) while in sediment it is 541.66 days (13000 hrs). Based on these half-life values of Disodium 4,4’-(2,4-dihydroxy-5- hydroxymethyl-1,3-phenylene bis-azo) di- (naphthalene-1-sulfonate), it is concluded that the chemical is persistent in water and sediment.

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

Half-life period of Disodium 4,4’-(2,4-dihydroxy-5- hydroxymethyl-1,3-phenylene bis-azo) di- (naphthalene-1-sulfonate), in water is observed to be 60 days (1440 hrs.) while in sediment it is 541.66 days (13000 hrs). Based on these half-life values of Disodium 4,4’-(2,4-dihydroxy-5- hydroxymethyl-1,3-phenylene bis-azo) di- (naphthalene-1-sulfonate), it is concluded that the chemical is persistent in water and sediment.