Aquatic environment

Binding characteristics of perylene, phenanthrene and anthracene to di erentDOM fractions from lake water

MEI Yi , WU Fengchang , WANG Liying , BAI Yingchen , LI Wen , LIAO Haiqing


Received April 24, 2008,Revised August 28, 2008, Accepted , Available online

Volume 21,2009,Pages 414-423

  • Summary
  • References
  • Related Articles
Six hydrophobic and hydrophilic fractions were isolated using XAD-8 and XAD-4 resins, and were extensively characterized. Partition coe cients of perylene, phenanthrene and anthracene binding to the six fractions were determined by fluorescence quenching titration. The Kdoc values obtained for the polycyclic aromatic hydrocarbons (PAHs) binding to the hydrophobic fractions were larger than those to the hydrophilic fractions. Nonlinear Stern-Volmer plots were observed when binding phenanthrene and anthracene to some hydrophilic fraction samples, suggesting saturation of polar interaction binding sites. A significant correlation of logKdoc values with molecular weights and molar absorptivities at 280 nm was observed, while atomic ratio of C/H was found to be a poor indicator for aromaticity. Other structural descriptors such as para nic carbon and polarity influenced the DOM-fraction ability to bind PAHs. Di erent interaction mechanisms underlying binding of the di erent fractions to the PAHs were also discussed.

Copyright © Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences. Published by Elsevier B.V. and Science Press. All rights reserved.京ICP备05002858号-3