Photoformation of reactive oxygen species and their potential to degrade highly toxic carbaryl and methomyl in river water

• Published in: Chemosphere (Oxford) 2020-04, Vol.244, p.125464-125464, Article 125464
• Main Authors: Derbalah, Aly, Sunday, Michael, Kato, Ryota, Takeda, Kazuhiko, Sakugawa, Hiroshi
• Format: Article
• Language: English
• Subjects: Carbaryl; Carbaryl - chemistry; Fresh Water; Hydroxyl Radical; Hydroxyl radicals; Kinetics; Methomyl; Methomyl - chemistry; Photolysis; Reactive Oxygen Species - chemistry; Rivers - chemistry; Singlet Oxygen; Water; Water Pollutants, Chemical - chemistry
• ISSN: 0045-6535; 1879-1298
• DOI: 10.1016/j.chemosphere.2019.125464

Reactive oxygen species (ROS) including singlet oxygen (1O2) and hydroxylradicals (OH) photogenerated in natural waters play important roles in indirect photolysis of man-made pollutants. This study was conducted to investigate how the generation of these two ROS influences the degradation of two highly toxic insecticides (methomyl and carbaryl) in river water. To accomplish this, the reaction rate constants of 1O2 and OH with carbaryl and methomyl were determined; the degradation rate constants of the tested insecticides in ultrapure water (direct photolysis) and in river water in the presence and absence of 1O2 and OH scavengers were also measured. The rate constants for the reaction of OH with carbaryl and methomyl were found to be (14.8 ± 0.64) × 109 and (4.68 ± 0.52) × 109 M−1 s−1, respectively. The reaction rate constant of 1O2 with carbaryl (2.98 ± 0.10) × 105 M−1 s−1, was much higher than that of methomyl (