Full life-cycle toxicity assessment on triclosan using rotifer Brachionus calyciflorus

Ecotoxicology and Environmental Safety
Lilan ZhangYujuan Wang

Abstract

Triclosan (TCS) is an antimicrobial and is an aquatic contaminant. Little is known on aquatic toxicity of TCS. Rotifers are common members of freshwater zooplankton. In this study, Brachionus calyciflorus was chosen as a test organism to assess the acute and complete life cycle toxicity of TCS in this study. The acute toxicity results showed that the 24-h median lethal concentration (LC50) of TCS was 345±0.11μg/L (95% confidence limits of 212-564µg/L). Reproductive bioassays demonstrated that TCS could inhibit the population growth rate at the concentration higher than 1.0μg/L. Resting egg production encompasses the full life-cycle of rotifer, and thus its hatching rate were explored to assess the toxicity of TCS towards rotifer population at TCS concentrations ranging from 0.1 to 200µg/L at two different growth periods. When resting eggs were exposed to TCS during the formation period, 0.1 and 1.0µg/L of TCS increased the hatching rate from 0.402 to 0.502, and 0.475, respectively. Exposure to 100 and 200µg/L of TCS reduced the hatching rate to 0.309 and 0.275, respectively. When the resting eggs were formed in the control medium and hatched in medium with TCS, their hatching rates were not significantly influenced by TCS, exce...Continue Reading

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May 31, 2016·The Science of the Total Environment·Chu-Long HuangChang-Ping Yu
Jul 28, 2017·Scientific Reports·Jian TianJiaxin Yang
Nov 29, 2017·Journal of Toxicology and Environmental Health. Part B, Critical Reviews·Lisa M Weatherly, Julie A Gosse
Jan 21, 2021·Bulletin of Environmental Contamination and Toxicology·Xiaoping XuXueyu Wei

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