Gómez Ariza J L, Giráldez I, Sánchez-Rodas D, Morales E
Departamento de Química y Ciencia de los Materiales, Escuela Politécnica Superior, Universidad de Huelva, La Rábida, Spain.
Sci Total Environ. 2000 Feb 10;246(2-3):271-83. doi: 10.1016/s0048-9697(99)00468-4.
The feasibility of three sequential extraction schemes (a modification of the Tessier procedure, the scheme proposed by Meguellati and the protocol designed by BCR (now called the Standards, Measurements and Testing Programme, M&T) have been compared to study the distribution of As, Cd, Cr, Cu, Fe, Hg, Mn, Ni, Pb and Zn in sediment samples. The comparison has been performed by analyzing Certified Reference Material (CRM-601), a test material (S-12) and seven sediments from the Odiel Marshes Natural Park (located at the Atlantic coast of southern Spain). Samples were classified as sandy (with low iron oxide and organic matter contents) and clay-silty (with high iron oxide and organic matter contents) sediments. A higher metal mobility, especially under reducing conditions, was more properly assessed using the modified Tessier scheme compared to both the BCR and Meguellati procedures, these two later presenting comparative results for the reducible and residual phases. Significant Hg losses were found using the BCR procedure but the quantification of the acid phase for Cd, Cr and Ni was more reliable than that obtained with the modified Tessier and Meguellati schemes.
为研究沉积物样品中砷、镉、铬、铜、铁、汞、锰、镍、铅和锌的分布情况，对三种连续提取方案（Tessier方法的改进版、Meguellati提出的方案以及BCR设计的方案（现称为标准、测量与测试计划，即M&T））的可行性进行了比较。通过分析标准参考物质（CRM - 601）、一种测试物质（S - 12）以及来自奥迪埃尔沼泽自然公园（位于西班牙南部大西洋海岸）的七种沉积物进行了此项比较。样品被分类为砂质沉积物（氧化铁和有机质含量低）和黏土质粉质沉积物（氧化铁和有机质含量高）。与BCR和Meguellati方法相比，使用改进后的Tessier方案能更恰当地评估更高的金属迁移率，尤其是在还原条件下，后两种方法在可还原相和残留相方面呈现出比较结果。使用BCR方法发现汞有显著损失，但对于镉、铬和镍的酸相定量，BCR方法比改进后的Tessier方法和Meguellati方法更可靠。
