Pueyo M, Rauret G, Lück D, Yli-Halla M, Muntau H, Quevauviller P, López-Sánchez J F
Universidad de Barcelona, Departamento de Química Analítica, Martí i Franquès, 1-11, E-08028 Barcelona, Spain.
J Environ Monit. 2001 Feb;3(2):243-50. doi: 10.1039/b010235k.
Sequential extraction procedures have been used during the last decades to study and determine trace element mobility in aquatic sediments. However, the results obtained are operationally defined and, therefore, the significance of the analytical results is related to the extraction scheme used. So, there is a need for suitable reference materials for this type of study to enable the validation of the methodologies and to control the quality of the measurements. This paper describes the preparation of a sediment reference material, BCR-701, the homogeneity and stability studies and the analytical work performed for the certification of the extractable contents of some trace elements, following a collaboratively tested and optimised sequential (three-step) extraction procedure. The paper contains all the results and gives the methods used to certify the extractable contents (mass fractions expressed as mg kg-1 on a dry matter basis) of Cd, Cr, Cu, Ni, Pb and Zn in all steps. Moreover, indicative values are given for the aqua regia extractable contents of the six elements in the sediment and the residue obtained after sequential extraction.
在过去几十年中，连续提取程序已被用于研究和确定水生沉积物中微量元素的迁移性。然而，所获得的结果是根据操作定义的，因此，分析结果的意义与所使用的提取方案有关。所以，对于这类研究需要合适的参考物质，以验证方法并控制测量质量。本文描述了一种沉积物参考物质BCR - 701的制备、均匀性和稳定性研究，以及按照经协同测试和优化的连续（三步）提取程序对某些微量元素可提取含量进行认证所开展的分析工作。本文包含了所有结果，并给出了用于认证各步骤中镉、铬、铜、镍、铅和锌可提取含量（以干物质计，质量分数表示为mg kg-1）的方法。此外，还给出了沉积物中六种元素王水可提取含量以及连续提取后所得残渣的指示性值。
