Leaching characteristics of polycyclic aromatic hydrocarbons (PAHs) from spiked sandy soil.
In order to evaluate the factors affecting leachability of hydrophobic organic pollutants (HOPs), we performed leaching tests under a variety of conditions using sandy soil contaminated with phenanthrene and pyrene. The results obtained were: (1) the shaking time, temperature, and dissolved humic matter (DHM, as coexisting matter) increased leachability; (2) ionic strength reduced leachability; and (3) the liquid-to-solid ratio and pH level had no effect on leaching concentration of HOPs. In DHM-added leaching tests assuming equilibrium with HOPs, DHM, and solid matrix, the partitioning (binding) coefficient of HOPs to DHM was accurately calculated with the equations proposed in this study. While we recommend taking into consideration the coexistence of DHM, it is difficult to use universally because its properties differ according to origin and extracting method. It is therefore reasonable to use an alternative reagent having an effect similar to that of DHM.
Kim
Yong-Jin
YJ
Research Center for Material Cycles and Waste Management, The National Institute for Environmental Studies, 16-2 Onogawa, Tsukuba-Shi, Ibaraki 305-8506, Japan. kim.yongjin@nies.go.jp
Osako
Masahiro
M
D000327:Adsorption; D006812:Humic Substances / Q000737:chemistry; D006863:Hydrogen-Ion Concentration; D009994:Osmolar Concentration; D011084:Polycyclic Aromatic Hydrocarbons / Q000032:analysis / Q000737:chemistry*; D012822:Silicon Dioxide / Q000032:analysis*; D012989:Soil Pollutants / Q000032:analysis*; D013696:Temperature; D013997:Time Factors
D006812:Humic Substances; D011084:Polycyclic Aromatic Hydrocarbons; D012989:Soil Pollutants; D012822:Silicon Dioxide