Comparison of the Effects of Ultraviolet, H2O2/UV and
Gamma-Irradiation Processes on Frozen and Liquid Water
Solutions of Monochlorophenols

J 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 a Ivan HOLOUBEK

Základní údaje

Originální název

Comparison of the Effects of Ultraviolet, H2O2/UV and Gamma-Irradiation Processes on Frozen and Liquid Water Solutions of Monochlorophenols

Autoři

KLÁNOVÁ, Jana; Petr KLÁN; Dominik HEGER a Ivan HOLOUBEK

Vydání

Photochemical and Photobiological Sciences, Cambridge, United Kingdom, Royal Society of Chemistry, 2003, 1474-905X

Další údaje

Jazyk

angličtina

Typ výsledku

Článek v odborném periodiku

Obor

10401 Organic chemistry

Stát vydavatele

Velká Británie a Severní Irsko

Utajení

není předmětem státního či obchodního tajemství

Impakt faktor

Impact factor: 1.359

Označené pro přenos do RIV

Ano

Kód RIV

RIV/00216224:14310/03:00008224

Organizační jednotka

Přírodovědecká fakulta

UT WoS

000185828300009

Klíčová slova anglicky

photochemistry

Štítky

Photochemistry

Příznaky

Mezinárodní význam

Změněno: 30. 3. 2010 13:29, prof. RNDr. Petr Klán, Ph.D.

Anotace

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.

Návaznosti

GA205/02/0896, projekt VaV

Název: Fotochemie perzistentních organických látek v ledu a na jeho povrchu

Investor: Grantová agentura ČR, Fotochemie perzistentních organických látek v ledu a na jeho povrchu

Citovat

KLÁNOVÁ, Jana; Petr KLÁN; Dominik HEGER a Ivan HOLOUBEK. Comparison of the Effects of Ultraviolet, H2O2/UV and Gamma-Irradiation Processes on Frozen and Liquid Water Solutions of Monochlorophenols. Photochemical and Photobiological Sciences. Cambridge, United Kingdom: Royal Society of Chemistry, 2003, roč. 2, č. 10, s. 1023-1031. ISSN 1474-905X.

@article{489463,
   author = {Klánová, Jana and Klán, Petr and Heger, Dominik and Holoubek, Ivan},
   article_location = {Cambridge, United Kingdom},
   article_number = {10},
   keywords = {photochemistry},
   language = {eng},
   issn = {1474-905X},
   journal = {Photochemical and Photobiological Sciences},
   title = {Comparison of the Effects of Ultraviolet, H2O2/UV and Gamma-Irradiation Processes on Frozen and Liquid Water Solutions of Monochlorophenols},
   volume = {2},
   year = {2003}
}

TY  - JOUR
ID  - 489463
AU  - Klánová, Jana - Klán, Petr - Heger, Dominik - Holoubek, Ivan
PY  - 2003
TI  - Comparison of the Effects of Ultraviolet, H2O2/UV and Gamma-Irradiation Processes on Frozen and Liquid Water Solutions of Monochlorophenols
JF  - Photochemical and Photobiological Sciences
VL  - 2
IS  - 10
SP  - 1023
EP  - 1023
PB  - Royal Society of Chemistry
SN  - 1474905X
KW  - photochemistry
N2  - 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.
ER  -

KLÁNOVÁ, Jana; Petr KLÁN; Dominik HEGER a Ivan HOLOUBEK. Comparison of the Effects of Ultraviolet, H2O2/UV and Gamma-Irradiation Processes on Frozen and Liquid Water Solutions of Monochlorophenols. \textit{Photochemical and Photobiological Sciences}. Cambridge, United Kingdom: Royal Society of Chemistry, 2003, roč.~2, č.~10, s.~1023-1031. ISSN~1474-905X.

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