Abstract
The discovery of the very acidic nature of fog and clouds1,2 has created much interest in sampling, analysing, and elucidating the chemistry of fog, principally because an understanding of the chemical transformations leading to acid fog may provide important clues to the origin of acid rain. Recently, the knowledge of the chemistry of fog has expanded to include carbonyl compounds3, volatile organic acids4, and alkyl sulphonates5,6. We have discovered that a variety of pesticides and their toxic alteration products are present in fog, and that they occasionally reach high concentrations relative to reported rainwater concentrations. In our experiments, we were able to measure the air–water distribution coefficients of pesticides between the liquid fog and the interstitial gas phase. These measurements reveal that some chemicals are enriched several thousandfold in the suspended liquid fog droplets compared to equilibrium distributions expected from Henry's Law coefficients for pure aqueous solutions.
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Glotfelty, D., Seiber, J. & Liljedahl, A. Pesticides in fog. Nature 325, 602–605 (1987). https://doi.org/10.1038/325602a0
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DOI: https://doi.org/10.1038/325602a0
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