Tokman Nilgun, Akman Suleyman, Ozeroglu Cemal
Department of Chemistry, Faculty of Science and Letters, Istanbul Technical University, 34469 Maslak, Istanbul, Turkey.
Talanta. 2004 Jun 17;63(3):699-703. doi: 10.1016/j.talanta.2003.12.018.
In this study, a water-soluble polymer, polyvinylpyrrolidinone (PVP) having chelating functionalities was used for the preconcentration and separation of traces of Pb, Cu, Ve and Mn prior to their determination by graphite furnace atomic absorption spectrometry. For this purpose, the sample and the PVP solutions were mixed and the metal bound polymer was precipitated by adding the mixture onto acetone. The precipitate was separated by decantation and dissolved with water. By increasing the ratio of the volumes of sample to water used in dissolving the precipitate, the analyte elements were concentrated as needed. The concentration of trace elements was determined using graphite furnace atomic absorption spectrometry. The analyte elements in matrix free aqueous solutions were quantitatively recovered. The validity of the proposed method was checked with a standard reference material (NIST SRM 1577b bovine liver) and spiked fruit juice, sea water and mineral water samples. The analytical results were found to be in good agreement with certified and added values. Detection limits (3delta) were 1.7, 3.6 and 4.1mugl(-1) for Pb, Cu and Mn, respectively, using 10mul of sample volume. The method is novel and can be characterized by rapidity, simplicity, quantitative recovery and high reproducibility.
在本研究中，一种具有螯合功能的水溶性聚合物聚乙烯吡咯烷酮（PVP）被用于在通过石墨炉原子吸收光谱法测定痕量铅、铜、钒和锰之前对其进行预富集和分离。为此，将样品和PVP溶液混合，然后将混合物加入丙酮中使金属结合的聚合物沉淀。通过倾析分离沉淀物并用蒸馏水溶解。通过增加溶解沉淀物所用水的体积与样品体积的比例，可根据需要对分析元素进行富集。使用石墨炉原子吸收光谱法测定痕量元素的浓度。在无基体水溶液中的分析元素被定量回收。用标准参考物质（NIST SRM 1577b牛肝）以及加标果汁、海水和矿泉水样品检验了所提出方法的有效性。分析结果与认定值和加标值高度吻合。使用10μL样品体积时，铅、铜和锰的检测限（3δ）分别为1.7、3.6和4.1μg L-1。该方法新颖，具有快速、简便、定量回收和高重现性的特点。
