Selectivity assessment of a sequential extraction procedure for metal mobility characterization using model phases
Selectivity assessment of a sequential extraction procedure for metal mobility characterization using model phases
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DOI：
10.1016/s0039-9140(00)00410-0
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发表时间：
2000-06-30
期刊：
影响因子：
6.1
通讯作者：
Morales, E
中科院分区：
文献类型：
--
作者：
Ariza, JLG;Giráldez, I;Morales, E
本研究认为，在连续提取方案中使用的金属流动性评估的提取剂的选择性，通过分析个别矿物相以前共沉淀或吸附与微量金属。所评价的方案是Tessier等人[A. Tessier，P.C.C.坎贝尔，M.比森，阿纳尔。Chem.51（1979）844]作者提出的顺序方法。研究的相是方解石，无定形氧化铁，黑锰矿，腐殖酸，高岭石和伊利石。选择性提取获得的As，Cr，Cu，Ni，pH值和Zn在金属共沉淀相，而NH 2 OH-HCl是没有选择性的提取汞和镉共沉淀黑锰矿和无定形氧化铁，分别。吸附在各相上的Cd、Hg、Ni、Zn可通过MgCl_2和NaOAc/HOAc进行释放，而As、Cr、Cn、Pb的释放则需要更强的试剂。(C)2000 Elsevier Science B. V.保留所有权利。
This study considers the selectivity of the extractants used in a sequential extraction scheme for metals mobility assessment by analyzing individual mineral phases previously coprecipitated or sorbed with trace metals. The scheme evaluated was a modification of the Tessier et al. [A. Tessier, P.C.C. Campbell, M. Bisson, Anal. Chem. 51 (1979) 844] sequential procedure proposed by the authors. The phases studied were calcite, amorphous iron oxide, hausmannite, humic acid, kaolinite and illite. Selective extractions were obtained for As, Cr, Cu, Ni, ph and Zn in metal-coprecipitated phases whereas NH2OH-HCl was not selective for the extraction of Hg and Cd coprecipitated in hausmannite and amorphous iron oxide, respectively. Otherwise, Cd, Hg, Ni and Zn sorbed on the different phases were released with MgCl2 and NaOAc/HOAc, but stronger reagents were needed to release As, Cr, Cn and Pb. (C) 2000 Elsevier Science B.V. All rights reserved.