2019 GA meeting May 8 in Madrid


The 2018 GA meeting which took place on Thursday 3 May 2018 in Brugge, Belgium saw an increase in attendance from 2017. Hosted by Prince-Erachem, the meeting which lasted 5 hours saw several deliberations related to the last REACH deadline and its consequences thereafter including the possible re-structuring of the consortium.  Some key decisions taken by way of vote are as follows:

Some highlights:

  • Future structure of Mara: A more streamline structure to be established if the organisation is to continue functioning infinitely or in the event of a complete closure its mandate and members to be incorporated within the Mn trade association –The IMnI. Discussions are still on-going  
  • Collaboration: A clearly defined pathway for collaboration between Mara and the IMnI was established
  • Data-sharing Regulation: Approval of the reimbursement structure (to be executed in phases) in accordance with regulation 2016/9
  • Approval of the 2018 workplan and budget

ACUTE TOXICITY TO DAPHNIA MAGNA/ Sinter ore (Manganese ores, reduced)/ OECD 440/2008/ GLP

Introduction. A study was performed to assess the acute toxicity of the test item to Daphnia magna. The method followed that described in the OECD Guidelines for Testing of Chemicals (April 2004) No 202, "Daphnia sp, Acute. Immobilisation Test" referenced as Method C2 of Commission Regulation (EC) No. 440/2008.


Results. The 48-Hour EL*50 for the test item to Daphnia magna based on nominal loading rates was greater than 100 mg/l loading rate WAF and correspondingly the No Observed Effect Loading rate was 100 mg/l loading rate WAF.


It was considered unnecessary and unrealistic to test at loading rates in excess of 100 mg/l.


The test preparations were analysed for manganese content. Analysis of the test preparations at 0 hours showed measured concentrations of manganese to be 0.330 and 0.326 mg/l. Analysis of the old media at 48 hours showed measured test concentrations of manganese to be 0.290 and 0.298 mg/l.


The dissolved test item may have been one or several components of the test item.

Given that toxicity cannot be attributed to a single component or mixture of components but to the test item as a whole, the results were based on nominal loading rates only.


The 48-Hour EC50 for the reference item to Daphnia magna based on nominal concentrations was 0.65 mg/l with 95% confidence limits of 0.58 - 0.72 mg/l. The No Observed Effect Concentration was 0.32 mg/l.


*EL = Effective Loading rate


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


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