According to the apparatus for identifying toxic substances according to the present invention, the bio-toxicity of an unknown sample and the bio-toxicity of an unknown sample treated with a plurality of columns packed with a substance capable of inhibiting heavy metal activity or adsorbing metal are compared, The simple method of calculating the rate of decay can be used easily to identify the toxic substances contained in the polluted water in a short time and to identify the kinds of heavy metals and to identify toxic substances contained in various polluted water.
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