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No reliable bounded acute or chronic toxicity data are available for the effect of magnesium on terrestrial organisms (plants, invertebrates and micro-organisms).Therefore the PNECsoil was derived by the Equilibrium Partitioning method (based on PNEC water and log Kd for sediment of 2.82 L/kg dw). Because the Equilibrium Partitioning method is considered conservative and the chemical safety assessment did not identify a risk for soil organisms, it was concluded that there is no need for further experimental testing of toxicity of Mg to soil organisms.