厦门西港潮间带柱状沉积物重金属赋存形态与污染评价

采用改进的BCR四步提取法研究厦门西港潮间带柱状沉积物中12种重金属元素(Ba、Co、Cr、Cu、Fe、Mn、Zn、Ni、Pb、Sr、V和Ti)不同形态的分布特征,并利用次生相和原生相比值法进行重金属污染评价。结果表明:在1975~2013年所对应的沉积柱中,Fe、Zn、Ba、Ti、Co、Cr、Ni、V和Cu主要以残渣态为主,Sr和Mn主要以弱酸溶态赋存,Pb以可还原态和残渣态为主。次生相和原生相比值法评价结果表明,Pb在1981~1983年、1991~2003年处于轻度到中度污染水平,作为生物成因元素的Sr和Mn不适于用本法评价,其他金属均未受到污染。

Speciation and Pollution Assessment of Heavy Metals in the Core Sediment of Western Xiamen Bay

The modified BCR sequential extraction procedure was applied to extract the speciation of 12 heavy metals (Ba, Co, Cr, Cu, Fe, Mn, Zn, Ni, Pb, Sr, V and Ti) in the core sediment samples collected from Western Xiamen Bay. The ratio of secondary phase to primary phase (RSP) was employed to assess the pollution level of above heavy metals. Results indicate that in core sediment of 1975-2013, Fe, Zn, Ba, Ti, Co, Cr, Ni, V and Cu are dominated in the residual fraction. Sr and Mn mainly occur in the acid-extractable fraction, while Pb is mainly in the reducible and residual fractions. The values of RSP suggest that the core sediments are not polluted by heavy metals except Sr and Mn. There had been slight to moderate pollution of Pb during 1981~1983 and 1991~2003, respectively. RSP is not appropriate for assessing the pollution of biogenic Sr and Mn.