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Ecotoxicological information

Sediment toxicity

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Description of key information

No long-term test data are available for freshwater sediment-dwelling organisms. 

Key value for chemical safety assessment

Additional information

No test data are available for long term sediment-dwelling organisms.

One short term test with a marine species is available. A reliable 10 day LC50 value of >2500 mg active acid/kg dw sediment has been determined for the effects of DTPMP-xNa on the mortality of the marine sediment ostracod Corophorium spp. However this value not a definite value (being a larger than value) therefore the risk characterisation is best understood by determining a PNEC with the equilibrium partitioning method.

In the absence of definitive test data a PNECsediment can be calculated from the PNECaquatic by the equilibrium partitioning method. Any requirement for further testing will be determined on the basis of the outcome of the risk characterisation carried out in accordance with Annex I.

Testing for toxicity to sediment organisms is not considered necessary because:

- PNECsediment has been calculated from PNECfreshwater on the basis of the equilibrium partitioning method; the risk characterisation ratio (RCR) based on PNECsediment is <1.