用稀硝酸单级提取法和BCR连续提取法对晋江感潮河段沉积物中重金属生物有效性进行研究。单级提取法表明，Cu、Pb、Cr、Zn、Cd、Sb、V、Ni、Co、Fe和Mn的酸提相含量在中游河段普遍较高。除V和Fe外，表层和柱状沉积物中其他9种重金属的生物有效性均相对较高。除在个别深度外，L43柱状沉积物中多数重金属元素生物有效性变化较平稳。采用改进的BCR四步连续提取法对表层沉积物中11种重金属进行形态分析，结果表明，Mn、Ni、Pb、Cu、Cd和Cr都具有较高的生物有效性；Zn在下游河段主要分布在残渣态中，但在中上游河段弱酸溶态含量的比例普遍较高；Sb在河段下游地区非残渣态含量要明显高于中上游地区。次生相与原生相分布比值法评价结果表明，除V和Fe处于无污染水平，其他9种重金属在不同的采样点均有不同程度的污染。
Both dilute nitric acid single stage extraction and BCR sequential extraction procedure were applied to examine the speciation of heavy metals in the sediments from tidal reach of the Jinjiang River, and the bioavailability of the heavy metals was determined. The results of single stage extraction show that the concentrations of Cu, Pb, Cr, Zn, Cd, Sb, V, Ni, Co, Fe and Mn were high in the middle of the river. The heavy metals exhibited higher bioavailability except for Fe and V in both the surface and core sediment. The bioavailability of most heavy metals in the core sediment varies smoothly except at individual depth. A modified BCR four?step sequential extraction procedure was used to obtain the speciation of 11 heavy metals in the surface sediments.The results showed that Mn, Ni, Cd, Pb, Cu and Cr presented higher bioavailability. Zn is mainly in the residual fraction at the downstream while mainly in the acid soluble fraction at upper middle river. The content of non?residual Sb at lower river is apparently higher than at upper middle river. The ratios of secondary phase to primary phase of heavy metals show that Cu, Pb, Cr, Zn, Cd, Sb, Ni, Co and Mn have different degrees of pollution in different samples.
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