2023 Mn REACH Conference September 26-28th Thon Hotel, City Centre, Brussels

Register Now

MARA's 2023 Mn REACH Conference is scheduled to take place on September 26-28 at the Thon Hotel City Centre, Brussels.

Speakers from the Manganese Industry, other Metal Consortia, European Metal Associations and Regulatory Experts will enlighten you on the short-term risks/threats on your businesses as well as your responsibilities under the Evaluation aspect of EU REACH


Register now!



ALGAL GROWTH INHIBITION TEST/ Mn3O4 (Trimanganese tetraoxide)/ OECD 201/ GLP

Introduction. A study was performed to assess the effect of the test item on the growth of the green alga Desmodesmus subspicatus. The method followed that described in the OECD Guidelines for Testing of Chemicals (2006) No 201, "Freshwater Alga and Cyanobacteria, Growth Inhibition Test" referenced as Method 0.3 of Commission Regulation (EC) No 440/2008.


Results. Exposure of Desmodesmus subspicatus to the test item gave EC50 values of greater than 100% v/v saturated solution and correspondingly the No Observed Effect Concentration was 100% v/v saturated solution.


The test item contained a theoretical manganese content of 72% w/w. The test samples were analysed for manganese only. Analysis of the test preparations at 0 and 72 hours showed measured manganese concentrations of less than the limit of quantitation (LOQ) of the analytical method employed were obtained which was determined to be 0.10 mg/l.


This does not infer that no test item was in solution, just that that which was present was at a concentration of less than 0.10 mg/l.


This study showed that there were no toxic effects at saturation.


To obtain the full study, please contact: reach@manganese.org


« Back to studies

About cookies on our website

Following a revised EU directive on website cookies, each company based, or doing business, in the EU is required to notify users about the cookies used on their website.

Our site uses cookies to improve your experience of certain areas of the site and to allow the use of specific functionality like social media page sharing. You may delete and block all cookies from this site, but as a result parts of the site may not work as intended.

To find out more about what cookies are, which cookies we use on this website and how to delete and block cookies, please see our Which cookies we use page.

Click on the button below to accept the use of cookies on this website (this will prevent the dialogue box from appearing on future visits)