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Sublethal toxicity of nano-titanium dioxide and carbon nanotubes in a sediment dwelling marine polychaete
May 2010
May 2010
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Abstract
The ecotoxicology of manufactured nanoparticles (MNPs) in estuarine environments is
not well understood. Here we explore the hypothesis that nanoTiO(2) and single walled
nanotubes (SWNT) cause sublethal impacts to the infaunal species Arenicola marina
(lugworm) exposed through natural sediments. Using a 10 day OECD/ASTM 1990 acute toxicity
test, no significant effects were seen for SWNT up to 0.03 g/kg and no uptake of SWNTs
into tissues was observed. A significant decrease in casting rate (P = 0.018), increase
in cellular damage (P = 0.04) and DNA damage in coelomocytes (P = 0.008) was measured
for nanoTiO(2), with a preliminary LOEC of 1 g/kg. Coherent anti-stokes Raman scattering
microscopy (CARS) located aggregates of TiO(2) of >200 nm within the lumen of the
gut and adhered to the outer epithelium of the worms, although no visible uptake of
particles into tissues was detected.
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