Toxicity values for cationic surfactants - Comparison of EC50/LC50 values obtained from different toxicity bioassays for cationic surfactants in emulsions and microemulsions

Effluents containing cationic softeners constitute a potential risk for the environment, which is commonly monitored by toxicity bioassays. In this st udy, EC50/LC50/LC50 for several cationic softeners, in both Emulsions and m icroemulsions, were estimated through bioassays (Photobacterium phosphoreum ) and aquatic biota (Chlorella vulgaris, Scenedesmus subspicatus, Selenastr um capricornutum, Daphnia magna and Oncorhynchus mykiss). The results obtai ned from the different bioassays were compared and their implications for t oxicity monitoring weve assessed.