Pin Christian, Joannon Sylviane
Département de Géologie, O.P.G.C., C.N.R.S., Université Blaise Pascal, Centre Régional de Mesures Physiques 5, rue Kessler, 63038 Clermont-Ferrand, Cedex, France.
Talanta. 2002 May 16;57(2):393-403. doi: 10.1016/s0039-9140(02)00040-1.
A new method was developed, aiming to overcome the iron and titanium interferences which severely limit the applications of a recently introduced extraction chromatography material, referred to as RE resin (formerly, RE Spec), to the analysis of geological samples. The separation scheme is based on the combined use, in tandem columns, of the conventional AG50WX4 cation-exchange resin and the RE extraction chromatography material, without any intervening evaporation step. The Lanthanides are recovered quantitatively, while recoveries for Zr, Hf and Th range from 94 to 98%. These three elements are determined using the isotope dilution method, thereby alleviating the need for a yield correction. Compared with conventional methods based on cation-exchange, this combined scheme offers a greater multi-element capability, significant miniaturisation, acid wastes reduction, and a higher degree of purity of the separated analytes with regard to unwanted elements such as Ba and residual Ca and Al. This concomitant isolation of 17 trace elements of great interest in the Earth and Environmental Sciences, achieved with excellent recoveries and satisfactory blank levels, can be used prior to high precision analysis of ultra-trace elements in geological samples by ICP-Mass Spectrometry.
开发了一种新方法，旨在克服铁和钛的干扰，这些干扰严重限制了最近引入的一种萃取色谱材料（称为RE树脂，以前称为RE Spec）在地质样品分析中的应用。分离方案基于在串联柱中联合使用常规的AG50WX4阳离子交换树脂和RE萃取色谱材料，无需任何中间蒸发步骤。镧系元素可定量回收，而Zr、Hf和Th的回收率在94%至98%之间。这三种元素采用同位素稀释法测定，从而无需进行产率校正。与基于阳离子交换的传统方法相比，这种联合方案具有更强的多元素分析能力、显著的小型化、减少酸废物，并且在分离的分析物相对于Ba以及残留的Ca和Al等不需要的元素方面具有更高的纯度。在通过电感耦合等离子体质谱对地质样品中的超痕量元素进行高精度分析之前，可以使用这种方法同时分离出地球和环境科学中极具研究价值的17种微量元素，回收率极佳且空白水平令人满意。
