Hennebrüder Kristina, Wennrich Rainer, Mattusch Jürgen, Stärk Hans-Joachim, Engewald Werner
Umweltforschungszentrum Leipzig-Halle, Department of Analytical Chemistry, Permoserstrasse 15, 04318 Leipzig, Germany; Institute of Analytical Chemistry, University of Leipzig, Linnèstr. 3, 04103 Leipzig, Germany.
Talanta. 2004 May 28;63(2):309-16. doi: 10.1016/j.talanta.2003.10.053.
An analytical scheme was developed for the determination of Gd-diethylenetriaminepentaacetate (Gd-DTPA), Gd and the other rare earth elements (REE) in river water by inductively coupled plasma (quadrupole) mass spectrometry (ICP-Q-MS). The preconcentration step was essential, since the limits of detection of this multielemental analytical technique are higher than the trace concentrations of the interesting elements in river water. Solid phase extraction (SPE) with different commercially available complexing agents (Chelex 100, Toyopearl and ethylhexylphosphates) was employed for the preconcentration of REE. The investigations revealed that complex stability (varying in dependence of the pH value) has a strong influence on the degree of the enrichment of Gd-DTPA. Based on acidified water samples (pH<3) a procedure using ethylhexylphosphates was proposed for the preconcentration of Gd and REE from surface water samples. For this purpose C(18)-cartridges loaded with ethylhexylphosphates were used, resulting in an enrichment factor of 40.
开发了一种分析方案，用于通过电感耦合等离子体（四极杆）质谱法（ICP-Q-MS）测定河水中的钆-二乙烯三胺五乙酸（Gd-DTPA）、钆和其他稀土元素（REE）。预浓缩步骤至关重要，因为这种多元素分析技术的检测限高于河水中感兴趣元素的痕量浓度。采用不同市售络合剂（Chelex 100、Toyopearl和乙基己基磷酸盐）的固相萃取（SPE）对稀土元素进行预浓缩。研究表明，络合物稳定性（随pH值变化）对Gd-DTPA的富集程度有很大影响。基于酸化水样（pH<3），提出了一种使用乙基己基磷酸盐从地表水样品中预浓缩钆和稀土元素的方法。为此，使用装有乙基己基磷酸盐的C(18)柱，富集因子为40。
