Detailed Information on Publication Record
2003
Comparison of the Effects of Ultraviolet, H2O2/UV and Gamma-Irradiation Processes on Frozen and Liquid Water Solutions of Monochlorophenols
KLÁNOVÁ, Jana, Petr KLÁN, Dominik HEGER and Ivan HOLOUBEKBasic information
Original name
Comparison of the Effects of Ultraviolet, H2O2/UV and Gamma-Irradiation Processes on Frozen and Liquid Water Solutions of Monochlorophenols
Authors
KLÁNOVÁ, Jana (203 Czech Republic), Petr KLÁN (203 Czech Republic, guarantor), Dominik HEGER (203 Czech Republic) and Ivan HOLOUBEK (203 Czech Republic)
Edition
Photochemical and Photobiological Sciences, Cambridge, United Kingdom, Royal Society of Chemistry, 2003, 1474-905X
Other information
Language
English
Type of outcome
Článek v odborném periodiku
Field of Study
10401 Organic chemistry
Country of publisher
United Kingdom of Great Britain and Northern Ireland
Confidentiality degree
není předmětem státního či obchodního tajemství
Impact factor
Impact factor: 1.359
RIV identification code
RIV/00216224:14310/03:00008224
Organization unit
Faculty of Science
UT WoS
000185828300009
Keywords in English
photochemistry
Tags
Tags
International impact
Změněno: 30/3/2010 13:29, prof. RNDr. Petr Klán, Ph.D.
Abstract
V originále
The effects of UV irradiation in the presence or in the absence of hydrogen peroxide as well as of gamma irradiation on 2- and 4-chlorophenol in the solid water ice matrix have been studied and compared to those effects known to occur in aqueous solutions. While UV photolysis (>280 nm) of monochlorophenols provided efficient coupling reactions in ice and photosolvolysis products in liquid water, hydroxylation into chlorobenzenediols is the main pathway in the presence of hydrogen peroxide in both phases. According to the results, the solute molecules accumulate in a layer surrounding the ice crystal walls during the freezing process where they react. Radiation chemistry of chlorophenol ice samples afforded preferably coupling reactions at 78 oC rather than reactions with the OH radicals produced by cleavage of water molecules under given conditions (1 kGy h-1). Apparent resemblance of chemistry in the UV/H2O2 treated liquid, solid, and gamma-irradiated liquid and solid samples is discussed. It is suggested that the reactions of the OH radicals within the polycrystalline ice or snow are important natural processes that should be considered in the environmental, ice-core or astrophysical research.
Links
GA205/02/0896, research and development project |
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