Application of HPLC capacity coefficients to characterize the sorption of polycyclic aromatic compounds to humic acid.
The sorption coefficients to humic acid of 46 PAC having a wide range in polarity were compared with the capacity coefficients of the PAC to a non-polar HPLC column material (ODS) and a polar one (Diol). It is shown that polar interactions contribute to the sorption of polar PAC in addition to the non-polar interactions. The results also suggest that humic acid may contain different hydrophilic adsorption sites. The non-polar column material was only the best model substrate, if the test materials were limited to the hydrophobic unsubstituted PAC, PAH+O,S-PAC.
Nielsen
T
T
Chemical Reactivity, Department of Environmental Science and Technology, MIL 313, Risø National Laboratory, P.O. Box 49, DK-4000, Roskilde, Denmark.
Helweg
C
C
Siigur
K
K
Kirso
U
U