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Acute toxicity of 4-nonylphenol (NP) was examined in six freshwater species from three phyla – platyhelminthes, arthropoda and mollusca. Values of the 48-hour LC50 of NP for six species ranged from 20 to 508 ug/L and values of the 96-hour LC50 for four species ranged from 120 to 457 ug/L. The most sensitive species tested was a water flea, Ceriodaphnia cornuta, with a 48-hour LC50 of 20 μg/L. The...
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