Research Article

Fractional Characteristics of Heavy Metals Pb, Zn, Cu, and Cd in Sewer Sediment from Areas in Central Beijing, China

Figure 1

Sampling sites in Xicheng District of Beijing, China. Note: black spots represent functional areas including old residential area (I), comprehensive area (II), new residential area (III), pedestrian only commercial area (IV), educational area (V), and business area (VI). Heavy traffic area at Chegongzhuang Street (C1 to C4) and Fuwai Street (F1 to F5).