Partitioning of polycyclic aromatic hydrocarbons to dissolved organic matter from different soils

摘要: Abstract Dissolved organic matter (DOM) in the soil solution or groundwater can have a considerable effect on dissipation of hydrophobic pollutants. We used fluorescence quenching technique as well reversed-phase separation to determine partition coefficient 3- 5-ring PAH dissolved from agricultural soils and forest floor materials. Several techniques (centrifugation, pressure filtration, percolation) are compared for obtaining DOM most representative natural use sorption experiments. Centrifugation was shown be suitable procedure obtain solutions large quantities with composition similar field solution. binding mineral found considerably lower acid These differences partly explained by compositional respect hydrophilic components DOM. Binding capacity only slightly affected changes pH electrical conductivity The coefficients rather different data given model solutions, such humic acids, fulvic Aldrich acid. To realistic estimates mobility chemicals soils, it is essential