Effects of Temperature and pH on Acute Toxicity of Triclosan in Pangasianodon hypophthalmus (Sauvage, 1878)
2020
Paul, Tapas | Shukla, S. P. | Kundan Kumar, | Poojary, Nalini | Manickavasagam, S. | Kumar, Saurav
The present investigation aimed to evaluate acute toxicity of an emergent pollutant, triclosan (TCS), in Pangasianodon hypophthalmus under the influence of varied temperatures and pH. Degradation of TCS in aqueous solution was estimated under in vitro condition at different temperatures and pH separately and in combination. Further, the effect of temperature (25, 30 and 35 °C) and pH (6.5, 7.5 and 8.5) on the acute toxicity of TCS for fish was evaluated. The combined effects of temperature and pH showed the highest degradation of TCS at temperature 35 °C and pH 7.5. The lowest 96-h LC₅₀ of TCS for P. hypophthalmus was observed at 25 °C and pH 6.5. Moreover, in the combinatorial study, the exposed fishes showed marked clinical signs of acute stress such as air-gulping, respiratory distress and overproduction of mucus on the surface of the body with varying degrees depending upon the concentration of TCS. Therefore, the environmental concentrations of TCS in different habitats may have different manifestations on aquatic organisms and might be applied in future screening level for ecotoxicological risk assessments.
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