• Environmental Analysis Health and Toxicology
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• v.15 no.1_2
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• pp.1-6
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• 2000

This study was designed to evaluated the ecotoxicity to Closterium ehrenbergii using Nonionic surfactants based on its chemical structure. Nonionic surfactants ecotoxicity tended to increase with decreasing the number of ethylene oxide units. The Closterium ehrenbergii test was good in sensitivity and agreement with other published results. The use of Closterium ehrenbergii test offers promising potential for ecotoxicological applications.

• ALGAE
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• v.32 no.2
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• pp.131-137
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• 2017

Although green algae of the genus Closterium are considered ideal models for testing toxicity in aquatic ecosystems, little data about the effects of toxicity on these algal species is currently available. Here, Closterium ehrenbergii was used to assess the acute toxicity of copper (Cu). The median effective concentration ($EC_{50}$) of copper sulfate based on a dose response curve was $0.202mg\;L^{-1}$, and reductions in photosynthetic efficiency ($F_v/F_m$ ratio) of cells were observed in cultures exposed to Cu for 6 h, with efficiency significantly reduced after 48 h (p < 0.01). In addition, production of reactive oxygen species significantly increased over time (p < 0.01), leading to damage to intracellular organelles. Our results indicate that Cu induces oxidative stress in cellular metabolic processes and causes severe physiological damage within C. ehrenbergii cells, and even cell death; moreover, they clearly suggest that C. ehrenbergii represents a potentially powerful test model for use in aquatic toxicity assessments.