Registration Dossier

Administrative data

Hazard for aquatic organisms

Freshwater

Hazard assessment conclusion:
PNEC aqua (freshwater)
PNEC value:
66.5 µg/L
Assessment factor:
1 000
Extrapolation method:
assessment factor
PNEC freshwater (intermittent releases):
665 µg/L

Marine water

Hazard assessment conclusion:
PNEC aqua (marine water)
PNEC value:
6.65 µg/L
Assessment factor:
10 000
Extrapolation method:
assessment factor

STP

Hazard assessment conclusion:
PNEC STP
PNEC value:
10 mg/L
Assessment factor:
100
Extrapolation method:
assessment factor

Sediment (freshwater)

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

Sediment (marine water)

Hazard assessment conclusion:
PNEC sediment (marine water)
PNEC value:
24.9 µg/kg sediment dw
Extrapolation method:
equilibrium partitioning method

Hazard for air

Hazard for terrestrial organisms

Soil

Hazard assessment conclusion:
PNEC soil
PNEC value:
10.7 µg/kg soil dw

Hazard for predators

Secondary poisoning

Hazard assessment conclusion:
no potential for bioaccumulation

Additional information

Conclusion on classification

Diphosphorus pentaoxide is hygroscopic forming with water an aqueous solution of phosphorus oxyacids (primary hydrolysis) which are subject to further (secondary) hydrolysis to the end product phosphoric acid, H3PO4. The end product of the hydrolysis is the ortho phosphoric acid, whereby the hydrolysis and the main product of the rapid hydrolysis is tetraphosphoric acid which is quite stable under under conditions relevant for ecotoxicological studies like low concentration and quite neutral pH value.

Hydrolysis of P2O5 in water under conditions relevant for ecotoxicological studies (100mg/L, 25°C) leads to slightly acidic solutions(pH 3.6) with the main product of tetraphosphoric acid. Further hydrolysis within the time frame of ecotoxicological studies is insignificant.

The aquatic tests to algae (OECD 201, pH regulated) showed EC50 values below 100 mg/L but above 10 mg/L. Since the substance is inorganic and biodegradibility is irrelevant, the information is conclusive but not sufficient for classification.

No environmental classification is proposed.