Registration Dossier

Administrative data

Hazard for aquatic organisms

Freshwater

Hazard assessment conclusion:
PNEC aqua (freshwater)
PNEC value:
0.068 mg/L
Assessment factor:
100
Extrapolation method:
assessment factor

Marine water

Hazard assessment conclusion:
PNEC aqua (marine water)
PNEC value:
0.007 mg/L
Assessment factor:
1 000
Extrapolation method:
assessment factor

STP

Hazard assessment conclusion:
PNEC STP
PNEC value:
40 mg/L
Assessment factor:
5
Extrapolation method:
assessment factor

Sediment (freshwater)

Hazard assessment conclusion:
PNEC sediment (freshwater)
PNEC value:
136 mg/kg sediment dw
Extrapolation method:
equilibrium partitioning method

Sediment (marine water)

Hazard assessment conclusion:
PNEC sediment (marine water)
PNEC value:
13.6 mg/kg sediment dw
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:
10 mg/kg soil dw
Assessment factor:
50
Extrapolation method:
assessment factor

Hazard for predators

Secondary poisoning

Hazard assessment conclusion:
PNEC oral
PNEC value:
3.7 mg/kg food
Assessment factor:
30

Additional information

HEDP sodium salts will fully dissociate in aqueous solution and will behave no differently to the parent HEDP acid and its sodium counter ion at equivalent concentrations. It is not expected that the sodium counter ion will contribute significantly to the overall toxicity of their HEDP salts. Therefore, the impact on aquatic organisms will be dominated by the effects of the HEDP acid and PNECs are derived in terms of HEDP acid.

Read-across between HEDP salts and the parent acid substance is considered appropriate because:

The category hypothesis is that all the members are various ionised forms of the acid CAS 2809-21-4. The main assumption is that sodium and potassium are not significant in respect of all the properties under consideration. HEDP salts will dissociate into HEDP and the counter-ion when in contact with aqueous and moist media, therefore the two substances should be assessed separately. In dilute aqueous conditions of defined pH a salt will behave no differently to the parent acid, at identical concentration of the particular speciated form present and will be fully dissociated. Hence some properties for a salt can be directly read-across (with suitable mass correction) to the parent acid and vice versa.

Conclusion on classification

Not classified according to Regulation (EC) No 1272/2008 classifiable based on the fact that short term toxicity data are >100 mg/L. In addition, the NOEC for long term toxicity with invertebrates is >1 mg/L therefore HEDP sodium is not classified for the environment.