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Ecotoxicological information

Toxicity to microorganisms

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Description of key information

The NOEC value for both total respiration and heterotrophic respiration was determined to be ≥ 1000 mg L-1.

Key value for chemical safety assessment

Additional information

This study evaluated the effect of Diammonium sodium hexakis (Nitrito-N) rhodate on the respiration of activated sludge (Muckle 2015). The study is reliable without restrictions, being GLP compliant and having followed the standard guidelines OECD 209, and EU-Method C.11. The duration of the test was 3 hours. Activated sludge, which was collected from a predominantly domestic sewage treatment plant, was used as inoculum. The substance 3,5-dichlorophenol was used as a positive control. Two experiments were carried out, a range-finding test followed by a limit test. All validity criteria were met.

At the nominal concentration of 1000 mg L-1, no significant inhibition was observed in treatments with and without the nitrification inhibitor N-allylthiourea (ATU). The respective NOEC value for both total respiration and heterotrophic respiration was determined to be ≥ 1000 mg L-1 nominal concentration.