Figure 2: Concentrations of individual PAE congeners in soil particle-size fractions in different soil layers.

(a) Soil layer (0–20 cm). (b) Soil layer (20–40 cm). (c) Soil layer (40–60 cm). (d) Soil layer (60–80 cm). (e) Soil layer (80–100 cm). In the x axis, F1, F2, F3, F4, and F5 represent soil coarse sand (250–2000 μm), fine sand (53–250 μm), coarse silt (20–53 μm), fine silt (2–20 μm), and clay (<2 μm), respectively.