Photochemical production of organic matter triplet states in water samples from mountain lakes, located below or above the tree line

Chemosphere
Elisa De LaurentiisDavide Vione

Abstract

The production of triplet states (T(*)) of chromophoric dissolved organic matter (CDOM), reacting with the probe molecule 2,4,6-trimethylphenol (TMP) was measured upon irradiation of water samples, taken from lakes located in a mountain area (NW Italy) between 1450 and 2750 m above sea level. The lakes are located below or above the tree line and surrounded by different vegetation types (trees, alpine meadows or exposed rocks). The most photoactive samples belonged to lakes below the tree line and their fluorescence spectra and CDOM optical features suggested the presence of a relatively elevated amount of humic (allochthonous) material. The lowest (negligible) photoactivity was found for a lake surrounded by exposed rocks. Its CDOM showed an important autochthonous contribution (due to in-lake productivity) and considerably higher spectral slope compared to the other samples, suggesting low CDOM molecular weight and/or aromaticity. Among the samples, CDOM photoactivity (measured as the rate of TMP-reactive T(*) photoproduction) decreased with changing vegetation type in the order: trees, meadows, rocks. It could be connected with decreasing contribution from catchment runoff and increasing contribution from autochthonous proce...Continue Reading

References

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Citations

Jul 17, 2012·Environmental Science & Technology·Elisa De LaurentiisDavide Vione
Feb 12, 2015·Environmental Science & Technology·Laleen C BodhipakshaAllison A MacKay
Oct 16, 2015·Photochemical & Photobiological Sciences : Official Journal of the European Photochemistry Association and the European Society for Photobiology·Francesco BarsottiDavide Vione
Jun 4, 2014·Chemistry : a European Journal·Davide VioneClaudio Minero
Sep 28, 2015·The Science of the Total Environment·Marco MinellaDavide Vione
Sep 10, 2015·Environmental Science. Processes & Impacts·Hongyu Li, Elizabeth C Minor
Oct 13, 2015·Journal of Environmental Sciences (China)·Wei DingFeng Wu
Feb 20, 2015·Photochemical & Photobiological Sciences : Official Journal of the European Photochemistry Association and the European Society for Photobiology·Yaling SuZhengwen Liu
Feb 2, 2017·Environmental Science & Technology·Luca CarenaDavide Vione
Jan 20, 2017·Photochemical & Photobiological Sciences : Official Journal of the European Photochemistry Association and the European Society for Photobiology·Francesco BarsottiDavide Vione
Jul 12, 2017·Environmental Science. Processes & Impacts·Andrew C Maizel, Christina K Remucal
Dec 24, 2018·Environmental Science. Processes & Impacts·Laura T StirchakD James Donaldson
Dec 2, 2020·The Science of the Total Environment·D VioneM Freppaz
Dec 3, 2020·The Science of the Total Environment·Yanwen YangRuochun Zhang
Jun 27, 2019·Environmental Science & Technology·Davide Vione, Andrea Scozzaro
Aug 14, 2020·Environmental Science & Technology·Joseph WasswaTeng Zeng
Sep 8, 2021·Environmental Science. Processes & Impacts·Davide VioneLuca Carena

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