Registration Dossier

Ecotoxicological information

Toxicity to microorganisms

Currently viewing:

Administrative data

Link to relevant study record(s)

Description of key information

The key study for this endpoint (Clarke, 2010) was conducted under GLP conditions and to the OECD guideline 209. The Study reported a 3 hour NOEC of >1000mg/l for sewage microorganisms collected from a predominantly domestic sewage treatment plant. The study was conducted at test concentrations of 10, 32, 100 , 320 and 1000mg/l.

Key value for chemical safety assessment

Additional information

Information provided by the Sponsor indicated that at the pH and concentration used in this study the test item was likely to have become unstable. It is considered likely that the addition of the test item to water resulted in the rapid decomposition of the substance to form zirconium hydroxide, together with accompanying release of carbonate and ammonium ions to the solution.

Key value for chemical safety assessment

NOEC: >1000mg/l

The key study was given a reliability score of 1 based upon the criteria of Klimisch et al, 1997, and the level of detail contained in the study report.