AI Article Synopsis
- The study examines the toxicity of fine particulate matter (PM2.5) in Atlanta using freshwater rotifers as test organisms.
- PM samples were extracted in water and methanol, and their toxic effects were measured in terms of LC50, indicating that ambient particles can kill between 50% of the rotifers at concentrations of 5 to 400 μg of PM.
- Methanol extracts of the aerosols proved to be significantly more toxic (8 ± 6 times) to the rotifers than water extracts, and over 70% of the observed toxicity was linked to the hydrophobic fraction of PM, suggesting complex interactions among different PM components.
Article Abstract
The toxicity of atmospheric fine particulate matter (PM2.5) in Atlanta is assessed using freshwater rotifers (Brachionus calyciflorus). The PM-laden quartz filters were extracted in both water and methanol. Aerosol extracts were passed through a C-18 column to separate the PM components into hydrophobic and hydrophilic fractions. Toxicity data reported in the units of LC50 (concentration that kills 50% of the test population in 24 h) shows that ambient particles are toxic to the rotifers with LC50 values ranging from 5 to 400 μg of PM. The methanol extract of the aerosols was substantially more toxic (8 ± 6 times) to the rotifers compared to the water extracts. A sizeable fraction (>70%) of toxicity was found to be associated with the hydrophobic fraction of PM. However, none of the bulk aerosol species was strongly correlated with the LC50 values suggesting a complicated mechanism of toxicity probably involving synergistic interactions of various PM components.
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| http://dx.doi.org/10.1016/j.envpol.2013.07.037 | DOI Listing |
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