《Table 2–Concentrations of PAHs with different rings and their removal efficiency in the original so

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《Removal of polycyclic aromatic hydrocarbons from different soil fractions by persulfate oxidation》

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Soil samples were collected from coking production areas（116°07′E–116°14′E，39°53′N–39°59′N）at a large-sized steel mill in Beijing，China.Upon collection，the soil samples were homogenized and sieved（20-mesh sieve）to assure uniformity，freeze-dried（LGJ-10D，Four-Ring Science Instrument Plant，Beijing，Co.，China），and stored in a refrigerator（4°C）until used.Preliminary testing of the soils indicated the following:As，28.5 mg/kg；Cd，0.35 mg/kg；Cu，37 mg/kg；Pb，174 mg/kg，Cr，60 mg/kg，Zn，201 mg/kg，pH，8.27，total organic content in soil，2.0%，respectively.The total concentration of16 USEPA priority PAHs in the soil tested was 1428 mg/kg，as shown in Table 1.