Pagnanelli F, Moscardini E, Giuliano V, Toro L
Department of Chemistry, University of Rome "La Sapienza", P.le A. Moro, 5, 00185 Rome, Italy.
Environ Pollut. 2004 Nov;132(2):189-201. doi: 10.1016/j.envpol.2004.05.002.
In this paper heavy metal pollution at an abandoned Italian pyrite mine has been investigated by comparing total concentrations and speciation of heavy metals (Fe, Cu, Mn, Zn, Pb and As) in a red mud sample and a river sediment. Acid digestions show that all the investigated heavy metals present larger concentrations in the sediment than in the tailing. A modified Tessier's procedure has been used to discriminate heavy metal bound to organic fraction from those originally present in the mineral sulphide matrix and to detect a possible trend of metal mobilisation from red mud to river sediment. Sequential extractions on bulk and size fractionated samples denote that sediment samples present larger percent concentrations of the investigated heavy metals in the first extractive steps (I-IV) especially in lower dimension size fractionated samples suggesting that heavy metals in the sediment are significantly bound by superficial adsorption mechanisms.
在本文中，通过比较赤泥样品和河流沉积物中重金属（铁、铜、锰、锌、铅和砷）的总浓度和形态，对意大利一个废弃硫铁矿的重金属污染进行了调查。酸消解表明，所有被调查的重金属在沉积物中的浓度都高于尾矿中的浓度。采用改进的 Tessier 方法来区分与有机部分结合的重金属和最初存在于矿物硫化物基质中的重金属，并检测重金属从赤泥向河流沉积物迁移的可能趋势。对整体和按粒度分级的样品进行连续萃取表明，沉积物样品在最初的萃取步骤（I-IV）中，尤其是在较小粒度分级的样品中，被调查重金属的百分浓度更高，这表明沉积物中的重金属主要通过表面吸附机制显著结合。
