Occurrence and transformation of phenoxy acids in aquatic environment and photochemical methods of their removal: a review

The results reported by Giri et al are consistent with the findings of Radwan et al who analyzed degradation of 2,4-D and MCPA in O3, UV/TiO2, and O3/UV/TiO2 systems

Paweł Muszyński; Marzena S. Brodowska; Tadeusz Paszko

2019

Scholarcy highlights

  • Herbicides from the phenoxyalkane acid group are the oldest yet still widely applied weed control agents
  • All processes that lower phenoxy acid concentrations in the water environment decrease the toxic effects of these compounds for aquatic organisms and humans
  • Hydrolytic decomposition is observed mainly in phenoxy acid esters, whereas their acidic forms are characterized by higher hydrolytic stability
  • Biodegradation plays a key role in phenoxy acid decomposition in water
  • Little is known about microorganisms that decompose phenoxy acids in water, and very few genes that encode phenoxy acid–degrading enzymes have been identified to date
  • In connection with the above, it is suggested that further research is needed in order to select the microflora suitable for conducting aerobic and anaerobic biodegradation of phenoxy acids and to identify possible pathways of their degradation
  • Little information is available regarding the degradation of phenoxy acids at low concentrations in the environment; there is a need for further research in this area

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