Abstract
Sediment and soil samples from Tingjiang, the biggest river in Fujian province, southeast China, were collected to assess the potential metallic pollution. Microwave-assisted digestion and ICP-MS were employed to determine the metal concentrations in two soil and three sediment samples from the basin. The distribution, the pollution status of thirteen element pollutions and the effluence from a metallurgy factory were investigated; the risk assessment was performed with two methods: the index of geo-accumulation and the ecological risk index. The index of geo-accumulation indicated the pollution status existed in the order of Cd > Cu = Mn > Zn = Se > Co = As > Pb > Ni > Cr = U > Th > Tl in the soil and Cd > Cu > As > Se > U > Co = Zn > Pb > Mn > Th > Ni = Tl > Cr in the sediment. The potential ecological risk index suggested the pollution existed in the soil in the order Cd > As > Cu > Pb > Zn > Cr and Cd > Cu > As > Pb > Zn > Cr in the sediment. Cd, Cu were identified as the main pollution factors, which coincided well with the possible influence from the metallurgy factory. The Risk Index values were 380 in the soil, 1,283 in the downstream sediment separately, which revealed that serious pollution and high ecological risks in some areas in this basin.
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