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Atmospheric Hydroxyl Radical Reaction Rate Coefficient and Total Environmental Lifetime of α-Endosulfan.
Alarcon, Paulo C; Kitanovski, Zoran; Padervand, Mohsen; Pöschl, Ulrich; Lammel, Gerhard; Zetzsch, Cornelius.
Afiliação
  • Alarcon PC; Multiphase Chemistry Department, Max Planck Institute for Chemistry, Mainz 55128, Germany.
  • Kitanovski Z; Multiphase Chemistry Department, Max Planck Institute for Chemistry, Mainz 55128, Germany.
  • Padervand M; Multiphase Chemistry Department, Max Planck Institute for Chemistry, Mainz 55128, Germany.
  • Pöschl U; Department of Chemistry, Faculty of Science, University of Maragheh, Maragheh 55181-8311, Iran.
  • Lammel G; Multiphase Chemistry Department, Max Planck Institute for Chemistry, Mainz 55128, Germany.
  • Zetzsch C; Multiphase Chemistry Department, Max Planck Institute for Chemistry, Mainz 55128, Germany.
Environ Sci Technol ; 57(42): 15999-16005, 2023 10 24.
Article em En | MEDLINE | ID: mdl-37831888
ABSTRACT
Endosulfan is a persistent organochlorine pesticide that was globally distributed before it was banned and continues to cycle in the Earth system. The chemical kinetics of the gas-phase reaction of α-endosulfan with the hydroxyl radical (OH) was studied by means of pulsed vacuum UV flash photolysis and time-resolved resonance fluorescence (FP-RF) as a function of temperature in the range of 348-395 K and led to a second-order rate coefficient kOH = 5.8 × 10-11 exp(-1960K/T) cm3 s-1 with an uncertainty range of 7 × 10-12 exp(-1210K/T) to 4 × 10-10 exp(-2710K/T) cm3 s-1. This corresponds to an estimated photochemical atmospheric half-life in the range of 3-12 months, which is much longer than previously assumed (days to weeks). Comparing the atmospheric concentrations observed after the global ban of endosulfan with environmental multimedia model predictions, we find that photochemical degradation in the atmosphere is slower than the model-estimated biodegradation in soil or water and that the latter limits the total environmental lifetime of endosulfan. We conclude that the lifetimes typically assumed for soil and aquatic systems are likely underestimated and should be revisited, in particular, for temperate and warm climates.
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Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Assunto principal: Praguicidas / Endossulfano Idioma: En Revista: Environ Sci Technol Ano de publicação: 2023 Tipo de documento: Article País de afiliação: Alemanha

Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Assunto principal: Praguicidas / Endossulfano Idioma: En Revista: Environ Sci Technol Ano de publicação: 2023 Tipo de documento: Article País de afiliação: Alemanha