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Sediment toxicity

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Endpoint:
sediment toxicity: long-term
Data waiving:
study scientifically not necessary / other information available
Justification for data waiving:
other:
Justification for type of information:
JUSTIFICATION FOR DATA WAIVING
In accordance with column 2 of REACH Annex X there is no need to consider testing, since CSA indicates no need to investigate further effects on sediment organisms. Furthermore, the equilibrium partitioning method is not applicable to lime (chemical) hydraulic, since its effect is caused by the hydroxyl ions (pH effect). The fate and behaviour of these ions is determined by the pH buffer capacity of the sediment rather than a partitioning coefficient (Kd). Because the sediment is expected to be more buffered than the water column, higher effect concentrations can be expected for sediment organisms. Furthermore, the substance will be present in its dissociated form in the natural aquatic environment. The OH- ions will react with HCO3- to form water and carbonate ions which react with Ca2+ to form calcium carbonate. Calcium carbonate precipitates and deposits on the sediment. Calcium carbonate is a constituent of natural soils.

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