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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.

The new ECHA CHEM database has been released by ECHA, and it now contains all REACH registration data. There are more details on the transition of ECHA's published data to ECHA CHEM here.

Diss Factsheets

Environmental fate & pathways

Endpoint summary

Administrative data

Description of key information

Additional information

Biodegradation in water :

2-Naphthalenol, 1-[[4-(phenylazo)phenyl]azo]-, ar',ar''-Me derivs is 50% biodegradable in water in 180 days (half-life) indicating 2-Naphthalenol, 1-[[4-(phenylazo)phenyl]azo]-, ar',ar''-Me derivs is not readily biodegradable in water since the half life is more than the threshold of 40 days qualify the chemical as persistent.

Media

Half life (days)

Percent in medium

Water

180

2%

Biodegradation in water and sediment: According to PBT Profiler , Half life period of 2-Naphthalenol, 1-[[4-(phenylazo)phenyl]azo]-, ar',ar''-Me derivs, in water is observed to be 4320hrs (180 days) while in sediment it is 38400hrs (1600 days). Based on these half life values it is concluded that the chemical 2-Naphthalenol, 1-[[4-(phenylazo)phenyl]azo]-, ar',ar''-Me derivs., is non biodegradable in both water as well sediment. Thesubstance will qualify as persistent as the half life exceeds the criteria of 40 and 120 days for water and sediment respectively.

Media

Half life (days)

Percent in medium

Water

180

2%

 

Sediment

1600

28%

Biodegradation in soil: The EPI Suite has estimated that 2-Naphthalenol, 1-[[4-(phenylazo)phenyl]azo]-, ar',ar''-Me derivs. is expected to be found predominantly in soil and its persistence estimate is based on its availability in this medium. Half-life of 2-Naphthalenol, 1-[[4-(phenylazo)phenyl]azo]-, ar',ar''-Me derivs. in soil was estimated to be 8640 hrs. (360 days) which exceeds the criteria of 120 days. Therefore, 2-Naphthalenol, 1-[[4-(phenylazo)phenyl]azo]-, ar',ar''-Me derivs. is estimated to be persistent in the soil environment.

 

Mass Amount (percent)

Half-Life (hr)

Emissions (kg/hr)

Soil

70.1

8.64e+003

1000

 

Fugacity (atm)

Reaction (kg/hr)

Advection (kg/hr)

Reaction (percent)

Advection (percent)

Soil

1.69e-020

1.88e+003

0

62.7

0