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The effects of selected cations and pH on the acute toxicity of copper (Cu) to barley root elongation were investigated to develop an appropriate biotic ligand model (BLM). The results showed that increasing activities of Mg 2+ and Ca 2+ , but not Na + and K + , linearly increased the EC50 (as Cu 2+ activity). Unchanged EC50 at solution pH less than 6.5 and...
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