Registration Dossier

Environmental fate & pathways

Endpoint summary

Administrative data

Description of key information

Additional information

Biodegradation in water:

Weight of evidence studies reviewed for biodegradation in water from reliable sources having Klimish rating 2.

The summary of the results is presented below:

Sr. No

Endpoint

%Degrdation

Remark

Sources

1

Biodegradation in water

0.72%

Not Readily biodegradable

Experimental result

2

Biodegradation in water

50% in (180 days)

Not Readily biodegradable

Predicted data

3

Biodegradation in water

-

Not Readily biodegradable

predicted data

4

Biodegradation in water

34.73

Not Readily biodegradable

QSAR

5

Biodegradation in water

3.6%

Not readily biodegradable

RA Study report

Based on the study and predicted data, it is concluded that the chemical is not biodegradable in water medium.

Biodegradation in Water and Sediment :

Half life period of α,α-bis[4-(dimethylamino)phenyl]-4-(phenylamino)naphthalene-1-methanol (Solvent Blue 4) in water was observed to be 180 days while in sediment it is 1600 days. The supporting studies also shows half life of α,α-bis[4-(dimethylamino)phenyl]-4-(phenylamino)naphthalene-1-methanol in water and sediment as 4320hrs (180 days) and 38900 hrs (1620.83 days) respectively. Based on these half life values it is concluded that α,α-bis[4-(dimethylamino)phenyl]-4-(phenylamino)naphthalene-1-methanol is not readily biodegradable in water and sediment.

Media

Half life

(days)

Percent in Medium

Water

180

1%

sediment

1600

48%

Media

Half life

(hrs)

Percent in medium

Emission

(kg/hr)

 

Soil

4320

0.675%

 

1000

Sediment

38900

49.4%

 

0

 

Based on these half life values it is concluded that α,α-bis[4-(dimethylamino)phenyl]-4-(phenylamino)naphthalene-1-methanol is not readily biodegradable in water and sediment.

Biodegradation in Soil :

Half life period of α,α-bis[4-(dimethylamino)phenyl]-4-(phenylamino)naphthalene-1-methanol (Solvent Blue 4) in soil was observed to be 83 days

Other Weight of Evidence studies also indicates that the Half life period of α,α-bis[4-(dimethylamino)phenyl]-4-(phenylamino)naphthalene-1-methanol in Soil was observed to be 360 days which exceeds the EPA criteria of >= 2 months (and <= 6 months).

Sr no

% degradation

End Point

Value

Unit

1

50

Half life

83

Days

2

50

Half life

360

Days

3

50

Half life

360

Days

 

Based on the above the endpoint values it can be concluded that the substanceα,α-bis[4-(dimethylamino)phenyl]-4-(phenylamino)naphthalene-1-methanol is not readily biodegradable (persistent) in Soil