Journal of Ecology and Rural Environment ›› 2022, Vol. 38 ›› Issue (9): 1188-1193.doi: 10.19741/j.issn.1673-4831.2022.0057

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The Photochemical Degradation of Pinoxaden in Liquid Solution

OU Jiang1,2, OU Xiao-ming1,2, LIU Kai-lin3, TENG Yu-ting3, YU Qin-qin1,2, LIANG Ji1,2, LIANG Gui-ping1,2   

  1. 1. National Engineering Research Center for Agrochemicals/Hunan Province Key Laboratory for Agrochemicals, Hunan Research Institute of Chemical Industry, Changsha 410014, China;
    2. Hunan Research Institute of Chemical Industry Testing Technology Co., Ltd., Changsha 410014, China;
    3. College of Plant Protection, Hunan Agricultural University, Changsha 410128, China
  • Received:2022-01-18 Online:2022-09-25 Published:2022-09-21

Abstract: The photolytic properties of pinoxaden under different conditions were investigated under the irradiation of a xenon lamp. The results show that the photodegradation of pinoxaden in various organic solvents conformed to the first-order kinetics. The photolysis rates descended in the order of acetonitrile, n-hexane, methanol and acetone, in which the half-lives of pinoxaden in these solvents were 9.76, 15.1, 31.5 and 138 h, respectively. The addition of NH4+ and NO3- at 1 mg·L-1 significantly increased the photodegradation rate of pinoxaden in aqueous solution, with the shortest half-life of pinoxaden as 3.17 h. The sensitization effect induced by these ions reduced as the concentrations further increased. Both Fe3+ and Cu2+ had a photoquenching effect on the photodegradation of pinoxaden, with a quenching rate up to 16.7%. The photolysis rates of pinoxaden in water were accelerated with increasing concentrations of H2O2 and TiO2. PNDA was used as a hydroxyl radical indicator to confirm that H2O2 and TiO2 both promoted the generation of hydroxyl radicals to accelerate the photodegradation of pinoxaden.

Key words: pinoxaden, liquid solution, photolysis, effect factor, half-life

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