Research output: Contribution to Journal/Magazine › Journal article › peer-review
Research output: Contribution to Journal/Magazine › Journal article › peer-review
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TY - JOUR
T1 - Photolytic degradation of methyl-parathion and fenitrothion in ice and water : implications for cold environments.
AU - Weber, Jan
AU - Kurková, Romano
AU - Klánová, Jana
AU - Klán, Petr
AU - Halsall, Crispin J.
PY - 2009/12
Y1 - 2009/12
N2 - Here we investigate the photodegradation of structurally similar organophosphorus pesticides; methyl-parathion and fenitrothion in water (20 °C) and ice (−15 °C) under environmentally-relevant conditions with the aim of comparing these laboratory findings to limited field observations. Both compounds were found to be photolyzed more efficiently in ice than in aqueous solutions, with quantum yields of degradation being higher in ice than in water (fenitrothion > methyl-parathion). This rather surprising observation was attributed to the concentration effect caused by freezing the aqueous solutions. The major phototransformation products included the corresponding oxons (methyl-paraoxon and fenitroxon) and the nitrophenols (3-methyl-nitrophenol and nitrophenol) in both irradiated water and ice samples. The presence of oxons in ice following irradiation, demonstrates an additional formation mechanism of these toxicologically relevant compounds in cold environments, although further photodegradation of oxons in ice indicates that photochemistry of OPs might be an environmentally important sink in cold environments. Photodegradation of methyl-parathion and fenitrothion in water and ice under environmentally-relevant conditions is described.
AB - Here we investigate the photodegradation of structurally similar organophosphorus pesticides; methyl-parathion and fenitrothion in water (20 °C) and ice (−15 °C) under environmentally-relevant conditions with the aim of comparing these laboratory findings to limited field observations. Both compounds were found to be photolyzed more efficiently in ice than in aqueous solutions, with quantum yields of degradation being higher in ice than in water (fenitrothion > methyl-parathion). This rather surprising observation was attributed to the concentration effect caused by freezing the aqueous solutions. The major phototransformation products included the corresponding oxons (methyl-paraoxon and fenitroxon) and the nitrophenols (3-methyl-nitrophenol and nitrophenol) in both irradiated water and ice samples. The presence of oxons in ice following irradiation, demonstrates an additional formation mechanism of these toxicologically relevant compounds in cold environments, although further photodegradation of oxons in ice indicates that photochemistry of OPs might be an environmentally important sink in cold environments. Photodegradation of methyl-parathion and fenitrothion in water and ice under environmentally-relevant conditions is described.
KW - Photochemistry
KW - Pesticides
KW - Solar
KW - Ice
KW - Mountains
KW - Arctic
U2 - 10.1016/j.envpol.2009.05.045
DO - 10.1016/j.envpol.2009.05.045
M3 - Journal article
VL - 157
SP - 3308
EP - 3313
JO - Environmental Pollution
JF - Environmental Pollution
SN - 0269-7491
IS - 12
ER -