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Hydrolysis and photolysis of bentazone in aqueous abiotic solutions and identification of its degradation products using quadrupole time-of-flight mass spectrometry

  • Shiming Song
  • Cuifang Zhang
  • Zhaojie Chen
  • Jie Wei
  • Huihua Tan
  • Xuesheng LiEmail author
Research Article

Abstract

Hydrolysis and photolysis of bentazone in abiotic aqueous solutions were examined under laboratory conditions. Hydrolysis was studied in different buffer solutions (pH 4.0 ± 0.1, 7.0 ± 0.1, and 9.0 ± 0.1), at different temperatures (15 °C ± 2 °C, 25 °C ± 2 °C, 35 °C ± 2 °C, and 45 °C ± 2 °C), and at different Fe3+ concentrations (1, 5, and 10 mg/L). Photolysis was assessed in different buffer solutions and at different solvent (methanol and ethyl acetate) concentrations (10%, 20%, and 30%) or Fe3+ (1, 5, and 10 mg/L) concentrations and under mercury or xenon light irradiation. Hydrolysis half-lives ranged 46–99 days at three different conditions. Photolysis half-lives ranged 2.3–7.5 h in three different conditions under mercury and xenon irradiation. Hydrolysis and photolysis of bentazone were accelerated by both alkaline conditions and elevated temperatures, and solvents and Fe3+ strongly enhanced bentazone degradation. Photodecomposition was much faster under a mercury lamp than under a xenon lamp. N-methyl bentazone and 6-OH bentazone/8-OH bentazone were identified as degradation products using UPLC-Q-TOF-MS. The data generated from this study could be useful for risk assessment of pesticides in the environment.

Keywords

Bentazone Hydrolysis Photolysis Degradation products UPLC-Q-TOF-MS 

Notes

Funding information

This work was financially supported by National Key R&D projects of comprehensive evaluation and optimization of environmental effects of chemical fertilizers and pesticides in tea garden [grant number 2016YFD0201208-4] and Guangxi Science and Technology Major Projects [grant number AA17204043].

Compliance with ethical standards

Conflict of interest

The authors declare that they have no conflict of interest.

Supplementary material

11356_2019_4232_MOESM1_ESM.docx (2.2 mb)
ESM 1 (DOCX 2220 kb)

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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2019

Authors and Affiliations

  1. 1.Institute of Pesticide and Environmental Toxicology, Guangxi Key Laboratory Cultivation Base of Agro-Environment and Agro-Product SafetyGuangxi UniversityNanningChina

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