Biofilm controlled sorption of selected acidic drugs on river sediments characterized by different organic carbon content

József Dobor, Margit Varga, Gyula Záray

Research output: Contribution to journalArticle

27 Citations (Scopus)

Abstract

The sorption process of selected non-steroidal anti-inflammatory drugs (ibuprofen, naproxen, ketoprofen, diclofenac) on biofilm covered river sediments were investigated in laboratory. In the course of the experiments, the effect of pH of aqueous phase, the effect of TOC (total organic carbon) content of biofilm on the sorption processes were studied. The determination of concentration of drugs was performed by gas chromatography mass spectrometry (GC-MS) both in liquid and solid phases. The pseudo-first-order rate constant of the sorption was found to be 83min-1. The effect of pH on the sorption of diclofenac was significantly lower than the obtained values in case of the other three drugs. The calculated Kd (sorption coefficient) values increased in the sequence of ibuprofen, naproxen, ketoprofen and diclofenac and varied between 0.1-0.4; 0.2-0.7; 0.2-1.2; 0.2-1.4kgL-1 respectively, depending on the characteristics of the sediments. The value of Kd×foc showed a straight line as function of foc (fraction of organic carbon) therefore, instead of the widely distributed normalization process (Kd/foc), an empirical equation (Kd=A/foc+B) was suggested for estimation of the Kd values in case of different TOC content sediments.

Original languageEnglish
Pages (from-to)105-110
Number of pages6
JournalChemosphere
Volume87
Issue number2
DOIs
Publication statusPublished - Apr 2012

Keywords

  • Distribution coefficient
  • Gas chromatography
  • Pharmaceuticals
  • Rate constant
  • Total organic carbon

ASJC Scopus subject areas

  • Environmental Engineering
  • Environmental Chemistry
  • Chemistry(all)
  • Pollution
  • Health, Toxicology and Mutagenesis

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