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Ecotoxicological information

Endpoint summary

Administrative data

Description of key information

Toxicity to soil macroorganisms except arthropods: nontoxic to earthworms up to a concentration in the soil (dry weight basis) of 1000 mg/kg.

LC50 > 1000 mg/kg

LC0 ≥ 1000 mg/kg soil.

Additional information

A toxicity study on soil macroorganisms except arthropods was run.

Studies on other terrestrial organisms or soil organisms were not run based on following grounds:

(1) the substance is highly water soluble, has an extremely low Kow and Koc, and therefore has a very low potential to adsorb to soil particles.

(2) based on ECHA's "Guidance on information requirements and chemical safety assessment - Chapter R.7c: Endpoint specific guidance", if there is no exposure of the soil, or the exposure is so low that no refinement of the PEClocal or PECregional, or PNECsoil organisms is required, then this test may not be necessary.

(3) according to ECHA guidance documents it generally can be assumed that soil exposure will occur unless it can be shown that there is no sludge application to land from exposed STPs and that aerial deposition is negligible and the relevance of other exposure pathways such as irrigation and/or contact with contaminated waste is unlikely. To this end, sludge application to land is not of relevance, as the substance has no adsorption capacity to wastewater sludge. Aerial deposition is considered negligible due to the low vapour pressure of the substance and use of the substance as a dye in aqueous solution. For the same reasons other exposure pathways such as irrigation and/or contact with contaminated waste are unlikely to become significant. Finally, the substance has a high capacity for adsorbing to cellulose fibres and it is unlikely to be released from dyed paper articles.

(4) aside from a certain body weight loss (compared to the control group) observed at test item concentrations > 125 mg/kg, the earthworm acute toxicity study did not reveal any toxic effects up to a concentration of 1000 mg/kg dw soil.

(5) finally, no adverse effects during the activated sludge respiration inhibition study were observed up to a concentration of 100 mg/l.