John Wiley & Sons, Ltd.

Bioaccumulation and toxicity of single walled carbon nanotubles (SWNT) to benthic organisms at the base of the marine food chain

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As the use of single‐walled carbon nanotubes (SWNT) increases over time, so does the potential for environmental release. Our research aimed to determine the toxicity, bioavailability and bioaccumulation of SWNT in marine benthic organisms at the base of the food chain. The toxicity of SWNT was tested in a whole sediment exposure with the amphipod Ampelisca abdita and the mysid Americamysis bahia. Additionally, SWNT were amended to sediment and/or food matrices to determine their bioavailability and bioaccumulation through these routes in A. abdita, A. bahia, and the estuarine amphipod Leptocheirus plumulosus. No significant mortality to any species via sediment or food matrices was observed at concentrations up to 100 ppm. A novel near infrared fluorescence (NIRF) spectroscopic method was utilized to measure and characterize the body burdens of pristine SWNT in non‐depurated and depurated organisms. SWNT were not detected in depurated organisms, but were quantified in non‐depurated A. abdita fed SWNT‐amended algae. After a 28 day exposure to [14C]SWNT‐amended sediment (100 µg/g) and algae (100 µg/g), [14C]SWNT was detected in depurated and non‐depurated L. plumulosus amphipods at 0.50 µg/g and 5.38 µg/g, respectively. The results indicate SWNT are bioaccessible to marine benthic organisms but do not appear to accumulate or cause toxicity. Environ. Toxicol. Chem. © 2013 SETAC

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