Disodium hydrogen bis[3-hydroxy-4-[(2-hydroxy-1-naphthyl)azo]naphthalene-1-sulphonato(3-)]chromate(3-)

Ecotoxicological Summary

Hazard for aquatic organisms

Freshwater

Hazard assessment conclusion:

PNEC aqua (freshwater)

PNEC value:

0.022 mg/L

Assessment factor:

1 000

Extrapolation method:

assessment factor

PNEC freshwater (intermittent releases):

0.22 mg/L

Marine water

Hazard assessment conclusion:

PNEC aqua (marine water)

PNEC value:

0.002 mg/L

Assessment factor:

10 000

Extrapolation method:

assessment factor

STP

Hazard assessment conclusion:

PNEC STP

PNEC value:

1.07 mg/L

Assessment factor:

100

Sediment (freshwater)

Hazard assessment conclusion:

PNEC sediment (freshwater)

PNEC value:

0.078 mg/kg sediment dw

Extrapolation method:

equilibrium partitioning method

Sediment (marine water)

Hazard assessment conclusion:

PNEC sediment (marine water)

PNEC value:

0.008 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:

0.004 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, wet}= K_{susp-water p}*PNEC_water*1000/RHO_sus

_{PNEC sed, dry = PNEC sed, wet x conversion factor (4.6)}

Where:

PNECwater	Predicted No Effect Concentration in water	[mg.l-1]	0,02
RHOsusp	bulk density of wet suspended matter	[kg.m-3]	1150
Ksusp water	partition coefficient suspended matter water	[m3.m-3]	0,979
PNECsed, wet	Predicted No Effect Concentration in sediment	[mg.kg-1of wet sediment]	0.017

 

PNECsed, dry

Predicted No Effect Concentration in sediment

[mg.kg-1of dry sediment]

0.078

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

 

Kp_susp= Foc_susp*Koc

 

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, dry = 0.0782  * 0.1 = 0.0078 mg/kg of dry marine sediment

PNEC soil using Equilibrium Partitioning Method:

The following formula is applied:

PNEC_soil= K_soil-water *PNEC_water*1000/RHO_soil

_{PNEC soil, dry = PNEC soli, wet x conversione factor (1.13)}

Where:

PNECwater	Predicted No Effect Concentration in water	[mg.l-1]	0.02
RHOsoil	bulk density of soil	[kg.m-3]	1701
Ksoil water	partition coefficient soil water	[m3.m-3]	0,294

PNECsoil, wet

Predicted No Effect Concentration in soil

[mg.kg-1 of wet soil]

0.003

 

PNECsoil, dry

Predicted No Effect Concentration in soil

[mg.kg-1 of dry soil]

0.004

  

  

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

Based on the value of LC50, 96h fish equal to 22 mg/l and the biodegradation results (inherently biodegradable, not rapid biodegradation), following the criteria of Directive 1272/2008 the substance is classified as Aquatic Chronic 3, H412: Harmful to aquatic life with long lasting effects