Zobrazeno 1 - 10
of 49
pro vyhledávání: '"Jürg Hoigné"'
Autor:
Urs Jans, Jürg Hoigné
Publikováno v:
Atmospheric Environment. 34:1069-1085
In droplets of clouds and fog the transformation of ozone (O3) to secondary oxidants, such as hydroxyl radicals (OH⋅), is an important process. As demonstrated by experiments on model solutions, chromophoric compounds, represented by ubiquitous iro
Autor:
Roy N. Colvile, John A. Lind, Margaret M. David, Jürg Hoigné, Elke Seyffer, Karin Acker, Sandro Fuzzi, Wolfgang Wiepercht, David L. Sedlak
Publikováno v:
Atmospheric Environment. 31:2515-2526
The role of iron and copper in the transformation of photooxidants (HO2/O2−) and pollutants in clouds was examined at a rural site (Great Dun Fell, U.K.). The observed concentrations of dissolved iron (60–1600 nM) and copper (4.2–31 nM) were lo
Autor:
Jürg Hoigné
Publikováno v:
Water Science and Technology. 35:1-8
OH radicals are the key oxidants that control most Advanced Oxidation Processes (AOPs) currently applied in water technology and that also occur in some natural systems such as cloud waters. The efficiencies of the various OH radical sources can be e
Publikováno v:
Environmental Science & Technology. 30:2227-2234
Autor:
Jürg Hoigné, Silvio Canonica
Publikováno v:
Chemosphere. 30:2365-2374
The rate coefficients for the photosensitized oxidation of various phenols in aqueous solutions containing dissolved natural organic material increased in some cases with decreasing phenol concentration. For 3,4-dimethoxyphenol and 4-methoxyphenol at
Autor:
Jürg Hoigné, Paul G. Tratnyek
Publikováno v:
Journal of Photochemistry and Photobiology A: Chemistry. 84:153-160
2,4,6-Trimethylphenol (TMP) is rapidly oxidized by singlet oxygen in aqueous solution. The observed rate of this reaction can be described as the sum of two second-order processes, one for the phenol and one for the phenoxide anion. The corresponding
Publikováno v:
Chemosphere. 28:1361-1368
The rates of photochemical transformation of nonylphenol (NP) and nonylphenol polyethoxylates (NPnEO) in natural waters were assessed by exposing their solutions in filtered lake water (DOC=4 mg/L) to sunlight. The first-order rate constant of sunlig
Autor:
Yuegang Zuo, Jürg Hoigné
Publikováno v:
Atmospheric Environment. 28:1231-1239
Kinetics of the iron(III) catalysed photochemical degradation of oxalic, glyoxalic and pyruvic acids has been investigated under conditions representative of atmospheric waters. Degradation rates for the organic acids are proportional to the concentr
Autor:
Jürg Hoigné, Paul G. Tratnyek
Publikováno v:
Water Research. 28:57-66
Chlorine dioxide (OCIO) rapidly oxidizes substituted phenoxide anions in aqueous solution and second-order rate constants for this reaction have recently been reported for 25 compounds. Analysis of these data for correlations reveals several quantita
Autor:
Heinz Bader, Jürg Hoigné
Publikováno v:
Water Research. 28:45-55
The kinetics of chlorine dioxide consumption by a wide range of inorganic and organic compounds, including a comprehensive series of phenols, have been determined using conventional batch-type and stopped-flow methods. In all cases, the rate law was