ZHANG Wei-fang 1, YU Rui-lian1,*, HU Gong-ren1,2
（1.College of Chemical Engineering, Huaqiao University, Xiamen 361021,China；
2. The State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550002, china）
Abstract：The speciation of heavy metals (Fe, Zn, Ni, Pb, Cu and Cr) in the core sediment from the Jinjiang estuary was analyzed using the modified BCR sequential extraction procedure. The results showed that the speciation of heavy metals is coincident basically in the vertical distribution. Iron is mainly in the residual fraction, Pb, Cu and Ni are mainly in the reducible fraction, Zn is mainly in the acid soluble fraction and Cr is mainly in the oxidizable fraction. By considering the percentage of the extractable fractions (sum of the first three steps) of heavy metals, the mobility order is Cu>Cr>Pb=Zn=Ni>Fe. Zinc, Ni, Pb, Cu and Cr exhibit higher mobility, bioavailability and potential risk to the environment. The ratios of secondary phase to primary phase of heavy metals showed that Fe presents no pollution, while Zn, Pb, Ni, Cu and Cr are at the moderate pollution level to the severe pollution level.
Key words：heavy metal; core sediment; speciation; potential ecological risk; Jinjiang estuary
EARTH AND ENVIRONMENT Vol. 42, No.5, Tot No.301, 2014, Page 631-638
