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

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216224%3A14310%2F03%3A00008224" target="_blank" >RIV/00216224:14310/03:00008224 - isvavai.cz</a>

Výsledek na webu

—

DOI - Digital Object Identifier

—

Jazyk výsledku

angličtina

Název v původním jazyce

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

Popis výsledku v původním jazyce

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 ratherthan 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 discu

Název v anglickém jazyce

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

Popis výsledku anglicky

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 ratherthan 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 discu

Druh

J_x - Nezařazeno - Článek v odborném periodiku (Jimp, Jsc a Jost)

CEP obor

CC - Organická chemie

OECD FORD obor

—

Projekt

<a href="/cs/project/GA205%2F02%2F0896" target="_blank" >GA205/02/0896: Fotochemie perzistentních organických látek v ledu a na jeho povrchu</a><br>

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2003

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Photochemical and Photobiological Sciences

ISSN

1474-905X

e-ISSN

—

Svazek periodika

2

Číslo periodika v rámci svazku

10

Stát vydavatele periodika

GB - Spojené království Velké Británie a Severního Irska

Počet stran výsledku

9

Strana od-do

1023

Kód UT WoS článku

—

EID výsledku v databázi Scopus

—