Environmental risk assessment of freshwater sediments contaminated with triclosan
DOI:
https://doi.org/10.5132/eec.2017.01.02Resumo
The purpose of this study was to assess the environmental risk of sediments contaminated with triclosan to thropical aquatic invertebrates. Acute toxicity assays with Chironomus xanthus and chronic toxicity assays with Ceriodaphnia dubia were performed using spiked sediments with environmentally relevant concentrations of triclosan. We obtained a lethal concentration (LC50 96-h) in acute toxicity assays with C. xanthus of 45.26 μg g-1 and a no observed effect concentration (NOEC) and lowest observed effect concentration (LOEC) for C. dubia of 5.78 and 6.94 μg g-1, respectively. According to equilibrium partitioning theory, these spiked sediment values are equivalent to interstitial water LC50 values of 47.28 μg L-1 for C. xanthus and an LOEC of 7.24 μg L-1 for C. dubia. Our results suggest that sediments contaminated with triclosan represent high risk to freshwater organisms, since this compound has been reported on the order of magnitude of μg g-1 in sediment near discharge of untreated domestic and industrial wastewater.Downloads
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