Registration Dossier

Diss Factsheets

Ecotoxicological information

Endpoint summary

Administrative data

Description of key information

Additional information

No data are available for the toxicity of Mg metal to aquatic organisms and read-across is made to soluble Mg salts (MgCl2 and MgSO4 + their hydrated forms). All data were reported based on added elemental Mg concentrations. The table below gives an overview of the reliable toxicity data selected for hazard assessment of magnesium.

Trophic level Species Parameter Endpoint  Value (mg Mg/L)  Reference
 Acute toxicity, freshwater              
 Fish  Pimephales promelas   mortality   96-h LC50   541  Mount et al., 1997
 Invertebrates  Daphnia magna   mortality   48-h LC50   140  Biesinger and Christensen, 1972
 Algae  Scenedesmus subspicatus  growth rate/biomass  72-h EC50  >12  Dengler, 2010a
 Acute toxicity, marine water             
 Fish  Menidia beryllina  mortality  48-h LC50  2800  Pillard et al., 2000
 Invertebrates  Americamysis bahia  mortality  48-h LC50  2650  Pillard et al., 2000
 Chronic toxicity, freshwater            
 Invertebrates  Daphnia magna  reproduction  21 -d NOEC 41   Biesinger and Christensen, 1972
 Algae  Scendesmus subspicatus  growth rate/biomass  72-h NOEC  ≥12  Dengler, 2010a

Reliable short-term toxicity data for freshwater organisms are available for three trophic levels: aquatic invertebrates, fish and algae. The lowest acute effect value was a 48-h LC50 of 140 mg Mg/L observed for the effect of MgCl2.6H2O on mortality of Daphnia magna. Acute toxicity data are also available for marine fish and invertebrates, with 48-h LC50 values of 2800 and 2650 mg Mg/L, respectively. Reliable long-term toxicity data for freshwater organisms are only available for aquatic invertebrates (Klimisch 2 study by Biesinger and Christensen, 1972) and algae (Klimisch 1 study by Degler, 2010a). The unbounded NOEC value for algae was however not taken into account for the PNEC derivation due to its high degree of uncertainty. No reliable studies are available for chronic toxicity of Mg to freshwater fish or higher plants or to marine organisms.

Categories Display