Low to negligible photoactivity of lake-water matter in the size range from 0.1 to 5 μm |
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Authors: | Minella Marco Romeo Fabio Vione Davide Maurino Valter Minero Claudio |
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Institution: | a Dipartimento di Chimica Analitica, Università di Torino, Via P. Giuria 5, 10125 Torino, Italy b Centro Interdipartimentale NatRisk, Università di Torino, Via Leonardo da Vinci 44, 10095 Grugliasco (TO), Italy |
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Abstract: | We found that the photochemical generation of reactive transients such as singlet oxygen and triplet states upon irradiation of different lake water samples is mostly accounted for by components smaller than 0.10 μm. Larger components often showed a much lower absorption and/or scattering of radiation compared with the smaller ones, with one exception where the minor to negligible photochemical activity of larger species was associated with significant radiation absorption/scattering. It is also shown that filtration of the lake water samples at 0.10 μm was able to effectively remove the suspended particles, differently from the usually suggested filtration at 0.45 μm. |
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Keywords: | Surface-water photochemistry Particulate matter Dynamic light scattering Trimethylphenol Furfuryl alcohol |
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