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
DOI:
Received April 24, 2008,Revised August 28, 2008, Accepted , Available online
Volume 21,2009,Pages 414-423
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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.
