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Single Event–Driven Export of Polycyclic Aromatic Hydrocarbons and Suspended Matter from Coal Tar–Contaminated Soil

^a Inst. für Geowissenschaften, Friedrich-Schiller-Univ. Jena, 07749, Jena, Germany
^b Lehrstuhl für Bodenkunde, Dep. für Ökologie, Wissenschaftszentrum Weihenstephan, Technische Univ. München, D-85350 Freising-Weihenstephan, Germany

View larger version (40K): [in this window] [in a new window]   FIG. 1. Depiction of the lysimeter set-up in the field.

View larger version (29K): [in this window] [in a new window]   FIG. 2. (a) Temperatures at ground level and at three depths below ground level (bgl), and (b) soil moisture conditions at two depths within Lys3.

View larger version (20K): [in this window] [in a new window]   FIG. 3. Mean precipitation and mean amount of seepage water during the 2-yr monitoring period. Single events connected with no-flow and drying periods are indicated by S; those connected with freezing–thawing are indicated by W.

View larger version (37K): [in this window] [in a new window]   FIG. 4. Course of (a) pH, (b) electrical conductivity, (c) turbidity, and (d) colloid and particle (0.7–200µm) concentration of the three lysimeters. Single events connected with no-flow and drying periods are indicated by S; those connected with freezing–thawing are indicated by W. The numbers in the subplots indicate the maximum values.

View larger version (25K): [in this window] [in a new window]   FIG. 5. Dissolved organic carbon (DOC) of the three lysimeters. Single events connected with no-flow and drying periods are indicated by S; those connected with freezing–thawing are indicated by W.

View larger version (42K): [in this window] [in a new window]   FIG. 6. Course of the polycyclic aromatic hydrocarbons in the two fractions <0.7 µm and >0.7 µm.

View larger version (17K): [in this window] [in a new window]   FIG. 7. Comparison of the mean aqueous equilibrium concentrations calculated after Raoult's law and mean concentrations of the single polycyclic aromatic hydrocarbon (PAH) in the filtrate of Lys3. The molecular weights of the coal tar for the three variants are 295, 230, and 780 g mol–1. Naphthalene (Nap), acenaphthylene (Acy), acenaphthene (Ace), fluorene (Flr), phenanthrene (Phe), anthracene (Ant), fluoranthene (FlA), pyrene (Pyr), benz[a]anthracene (BaA), chrysene (Chr), benzo[b]fluoranthene (BbFlA), benzo[k]fluoranthene (BkFlA), benzo[a]pyrene (BaP), indeno[1,2,3-c,d]pyrene (IcdP), dibenz[a,h]anthracene (DahA), benzo[g,h,i]perylene (BghiP).

View larger version (33K): [in this window] [in a new window]   FIG. 8. (a) Accumulated amount of dissolved organic carbon (DOC), colloids and particles (0.7–200 µm), and (b) accumulated amount of polycyclic aromatic hydrocarbons (PAH) in both fractions exported from Lys3. Single events connected with no-flow and drying periods are indicated by S; those connected with freezing–thawing are indicated by W.