Vacuum ultraviolet photolysis of diclofenac and the effects of its treated aqueous solutions on the proliferation and migratory responses of Tetrahymena pyriformis

Eszter Arany, Júlia Láng, Dávid Somogyvári, Orsolya Láng, Tünde Alapi, István Ilisz, Krisztina Gajda-Schrantz, András Dombi, László Kohidai, Klára Hernádi

Research output: Contribution to journalArticle

16 Citations (Scopus)

Abstract

The effects of dissolved O2, phosphate buffer and the initial concentration of diclofenac on the vacuum ultraviolet photolysis of this contaminant molecule were studied. Besides kinetic measurements, the irradiated, multicomponent samples were characterized via the proliferation and migratory responses (in sublethal concentrations) of the bioindicator eukaryotic ciliate Tetrahymena pyriformis. The results suggest that hydroxyl radicals, hydrogen atoms and hydroperoxyl radicals may all contribute to the degradation of diclofenac. The aromatic by-products of diclofenac were presumed to include a hydroxylated derivative, 1-(8-chlorocarbazolyl)acetic acid and 1-(8-hydroxycarbazolyl)acetic acid. The biological activity of photoexposed samples reflected the chemical transformation of diclofenac and was also dependent on the level of dissolved O2. The increase in toxicity of samples taken after different irradiation times did not exceed a factor of two. Our results suggest that the combination of vacuum ultraviolet photolysis with toxicity and chemotactic measurements can be a valuable method for the investigation of the elimination of micropollutants.

Original languageEnglish
Pages (from-to)996-1006
Number of pages11
JournalScience of the Total Environment
Volume468-469
DOIs
Publication statusPublished - Jan 15 2014

Keywords

  • Advanced oxidation process
  • Chemotaxis
  • Hydroxyl radical
  • Nonsteroidal anti-inflammatory drug
  • Photodegradation
  • Toxicity

ASJC Scopus subject areas

  • Environmental Engineering
  • Environmental Chemistry
  • Waste Management and Disposal
  • Pollution

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