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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.

The new ECHA CHEM database has been released by ECHA, and it now contains all REACH registration data. There are more details on the transition of ECHA's published data to ECHA CHEM here.

Diss Factsheets

Ecotoxicological information

Toxicity to aquatic algae and cyanobacteria

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Administrative data

Link to relevant study record(s)

Description of key information

An algal growth inhibition study was performed with soda-ash flux calcined in accordance with OECD guideline 201. Exposure of Desmodesmus subspicatus to the test item gave EC50 values of greater than 100% v/v saturated solution 

Key value for chemical safety assessment

Additional information

The key study (Vryenhoef 2010) was performed according to GLP and OECD guideline 201. Pre-study solubility work conducted indicated that it was not possible to obtain a testable solution of the test item using traditional methods of preparation e.g. ultrasonication and high shear mixing. Given the insoluble nature of the test item and also its high purity value it was considered that the most suitable method of preparation was as a saturated solution.  Following a preliminary range-finding test,Desmodesmus subspicatus was exposed to a solution of the test item at a concentration of 100% v/v saturated solution (six replicate flasks) for 72 hours. Samples of the algal populations were removed daily and cell concentrations determined for each control and treatment group, using a Coulter®Multisizer Particle Counter. Exposure o fDesmodesmus subspicatus to the test item gave EC50values of greater than 100% v/v saturated solution. The No Observed Effect Concentration was determined to be 100% v/v saturated solution