Contribution of inorganic and organic components to sorption of neutral and ionizable pharmaceuticals by sediment/soil

Hiroshi Yamamoto, Kohei Takemoto, Ikumi Tamura, Norihiro Shin-oka, Takahiro Nakano, Masayo Nishida, Yuta Honda, Shigemi Moriguchi, Yudai Nakamura

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

Our previous study showed that the sorption coefficient of certain polar pharmaceuticals to river sediment, especially particular amines, was unexpectedly high. Thus, we conducted sorption experiments of selected polar pharmaceuticals and pyrene derivatives, including amines, carboxylic acids, and neutral compounds, to model clay minerals, i.e., montmorillonite and kaolin, in addition to silica sands and humic substances. The contribution of each component was roughly estimated by simple fractionation of the individual sorption coefficients. Relatively high sorption coefficients (Kd values) were found, especially for amines on clay minerals, which suggest that electrochemical affinity may play an important role. The estimated contribution percentage suggests a relatively large contribution from inorganic constituents, such as clay minerals, for silt loam soil; in contrast, organic components predominantly contribute for sandy river sediments. These findings could be the key to understanding not only the fate and transport but also bioavailability and environmental risks of pharmaceuticals, which are mostly polar and/or ionizable.

Original languageEnglish
Pages (from-to)1-12
Number of pages12
JournalEnvironmental Science and Pollution Research
DOIs
Publication statusAccepted/In press - Mar 23 2016
Externally publishedYes

Keywords

  • Cation-exchange capacity
  • Clay minerals
  • Electrochemical affinity
  • Pharmaceuticals
  • Sediment
  • Sorption

ASJC Scopus subject areas

  • Environmental Chemistry
  • Health, Toxicology and Mutagenesis
  • Pollution

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