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Short-term toxicity to aquatic invertebrates

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Description of key information

The lowest 48-h LC50 for freshwater invertebrates was observed for the acute effect of MgCl2.6H2O on Daphnia magna (Biesinger and Christensen, 1972). The lowest 48-h LC50 for marine invertebrates was observed for the acute effect of MgCl2 on the mysid shrimp Americamysis bahia (Pillard et al., 2000).

Key value for chemical safety assessment

Fresh water invertebrates

Fresh water invertebrates
Effect concentration:
140 mg/L

Marine water invertebrates

Marine water invertebrates
Effect concentration:
2 650 mg/L

Additional information

No data were identified for the acute toxicity of Mg metal to aquatic invertebrates. Reliable studies (all Klimisch 2) are available for the acute toxicity of MgCl2and MgSO4(and their hydrated forms) in freshwater to the crustaceans Daphnia magna and Ceriodaphnia dubia and the tubificid worm Tubifex tubifex. The LC50 values range between 140 and 888 mg Mg/L. The reliable freshwater toxicity data do not differ significantly between MgCl2and MgSO4.

One reliable study reports the short-term toxicity of magnesium salts to marine invertebrates. As for fish, the reliable LC50 values for marine species were higher than for freshwater species. Pillard et al. (2000 & 2002) report 48-h LC50 values of 832, 1705 and 2650 mg Mg/L for the effect of MgCl2on the marine mysid shrimp Americamysis bahia in artificial seawater with a salinity of 10, 20 and 31‰, respectively. All concentrations were reported based on added Mg doses.

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