Registration Dossier

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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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

Administrative data

Hazard for aquatic organisms

Freshwater

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

Marine water

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

STP

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

Sediment (freshwater)

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

Sediment (marine water)

Hazard assessment conclusion:
PNEC sediment (marine water)
PNEC value:
3.34 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:
6.66 mg/kg soil dw
Extrapolation method:
equilibrium partitioning method

Hazard for predators

Secondary poisoning

Hazard assessment conclusion:
no potential to cause toxic effects if accumulated (in higher organisms) via the food chain

Additional information

Calculation of PNEC water was based on results obtained in short-term studies on fish, daphnia and algae. According to the guidance on information requirements and chemical safety assessment - chapter R10: characterisation of dose [concentration]-response for environment (ECHA, 2008), the lowest of three short term results was chosen for PNEC calculation (i.e. EC50 48 h Daphnia magna = 2.87 mg/l -estimated value based on measured concentration).

Conclusion on classification

According to the CLP Regulation (EC n.1272/2008), the threshold of classification of a substance for acute aquatic toxicity is 1 mg/l. This limit is compared with LC50 (96h) for fish, EC50 (48 h) for daphnia and EC50 (72 - 96 h) for algae or aquatic plants.

An experimental value of LC50 96h Zebra Fish (Branchydanio rerio) = 6.8 mg/l nominal concentration was obtained for Dioctyl phosphonate.

A study to assess the short-term toxicity to Daphnia Magna of Dioctyl phosphonate was performed and the result of the test was EC50 48 h Daphnia magna = 2.87 mg/l (estimated value based on measured concentration).

Toxicity on algae was assessed in 72 -hour test always on Dioctyl phosphonate. EC50 for algal growth rate was 18.4 mg/l (estimated value based on measured concentration)

No chronic toxicity data is available from long-term studies. In case of lack of chronic data, the potential for chronic toxicity is identified by appropriate combinations of acute toxicity data and lack of biodegradability and/ or the experimentally determined BCF ≥ 500 (or, if absent, the log Kow ≥ 4). The threshold of classification is 100 mg/l. 

In the case of Dioctyl phosphonate the data on acute aquatic toxicity are below the threshold value (EC50 48 h Daphnia magna = 2.87 mg/l is the lowest value) but the substance is ready-biodegradable (90 % in 28 days) and no experimental BCF is available. Estimate of logKow = 6.13 was carried out by algorithm GALAS as implemented in ACD/Percepta software. Dioctyl phosphonate is not easy to detect by HPLC because of lack of chromophore and it is low water soluble so the experimental tests for BCF and logKow are difficult to perform.

According to the CLP Regulation (EC n.1272/2008) the classification H413 (long-term aquatic toxicity cat.4) should be assigned if the aquatic toxicity data available not allow classification but there are nevertheless some grounds for concern.

On precautionary purpose for Dioctyl phosphonate the classification H412 (long-term aquatic toxicity cat.3) is suggested instead of H413 because the substance is ready-biodegradable but some effects regarding acute toxicity were observed for all three tropic levels (EC50 48 h Daphnia magna = 2.87 mg/l is the lowest value) and there is some concern regarding its bioaccumulation potential (estimated logKow =6.13)