Disodium 7-benzamido-4-hydroxy-3-[[4-[(4-sulphonatophenyl)azo]phenyl]azo]naphthalene-2-sulphonate

Ecotoxicological Summary

Hazard for aquatic organisms

Freshwater

Hazard assessment conclusion:

PNEC aqua (freshwater)

PNEC value:

0.1 mg/L

Assessment factor:

1 000

Extrapolation method:

assessment factor

PNEC freshwater (intermittent releases):

1 mg/L

Marine water

Hazard assessment conclusion:

PNEC aqua (marine water)

PNEC value:

0.01 mg/L

Assessment factor:

10 000

Extrapolation method:

assessment factor

STP

Hazard assessment conclusion:

PNEC STP

PNEC value:

20 mg/L

Assessment factor:

100

Sediment (freshwater)

Hazard assessment conclusion:

PNEC sediment (freshwater)

PNEC value:

0.085 mg/kg sediment dw

Extrapolation method:

equilibrium partitioning method

Sediment (marine water)

Hazard assessment conclusion:

PNEC sediment (marine water)

PNEC value:

0.009 mg/kg sediment dw

Assessment factor:

10

Extrapolation method:

equilibrium partitioning method

Hazard for air

Air

Hazard assessment conclusion:

no hazard identified

Hazard for terrestrial organisms

Soil

Hazard assessment conclusion:

PNEC soil

PNEC value:

0.017 mg/kg soil dw

Extrapolation method:

equilibrium partitioning method

Hazard for predators

Secondary poisoning

Hazard assessment conclusion:

no potential for bioaccumulation

Additional information

PNEC sediment using Equilibrium Partitioning Method:

The following formula is applied:

PNEC_sed= K_{susp-water p}*PNEC_water*1000/RHO_sus

Where:

PNECwater	Predicted No Effect Concentration in water	[mg.l-1]	0.1
RHOsusp	bulk density of wet suspended matter	[kg.m-3]	1150
Ksusp water	partition coefficient suspended matter water	[m3.m-3]	0.979
PNECsed	Predicted No Effect Concentration in sediment	[mg.kg-1of wet sediment]	0.085

 

K_{susp water}= Fwater_susp+ Fsolid_susp*Kp_susp/1000*RHO_solid

 

Kp_susp= Foc_susp*Koc

The value of Ksusp-water of 0.979 is consistent with the calculated value with EUSES 2.1.1. The tool gives 0.874 putting a Koc QSAR for organic acids 3.16 for non hydrophobic substances

 

PNEC marine sediment using Equilibrium Partitioning Method:

Being marine PNEC usually derived by freshwater PNEC with an adding assessment factor of 10, consequently the marine sediment PNEC can be directly derived from PNEC sediment with an assessment factor of 10.

Therefore PNEC marine sediments = 0.085*0.1 = 0.0085 mg/kg

 

PNEC soil using Equilibrium Partitioning Method:

The following formula is applied:

PNEC_soil= K_soil-water *PNEC_water*1000/RHO_soil

Where:

ECwater	Predicted No Effect Concentration in water	[mg.l-1]	0.1
RHOsoil	bulk density of soil	[kg.m-3]	1700
Ksoil water	partition coefficient soil water	[m3.m-3]	0.295
PNECsoil	Predicted No Effect Concentration in soil	[mg.kg-1]	0.0174

  

K_{soil water}= Fair_soil*K_air-waterl+Fwater_soil+ Fsolid_soil*Kp_soil/1000*RHO_solid

K_{soil water}= Fair_soil*K_air-waterl+Fwater_soil+ Fsolid_soil*Kp_soil/1000*RHO_solid

Kp_soil= Foc_soil*Koc

Conclusion on classification

According to EC 1972/2008 and related amendment II EC 286/2011, the substance has to be classified for acute aquatic toxicity if 96 hr LC50 (for fish)≤ 1 mg/l and/or 48 hr EC50 (for crustacea)≤ 1 mg/l and/or 72 or 96 hr ErC50 (for algae or other aquatic plants) ≤ 1 mg/l.

Since all the values are higher than the limit value for classification, the substance has not to be classified for acute and chronic aquatic toxicity.