Katarina Rosi Ketrin, Takayanagi Toshio, Oshita Koji, Oshima Mitsuko, Motomizu Shoji
Department of Chemistry, Faculty of Science, Okayama University, Okayama 700-8530, Japan.
Anal Sci. 2008 Dec;24(12):1537-44. doi: 10.2116/analsci.24.1537.
A sample-pretreatment method using a chitosan-based chelating resin, ethylenediamine-N,N,N'-triacetate-type chitosan (EDTriA-type chitosan), was developed for the preconcentration of trace metals in seawater and separation of the seawater matrix prior to their determination by inductively coupled plasma-mass spectrometry (ICP-MS). The resin showed very good adsorption for transition metals and rare-earth elements without any interference from alkali and alkaline-earth metals in an acidic media. In the proposed method, an aliquot of a 50-mL sample at pH 4 was used. Metals adsorbed on the resin were eluted using 10 mL of 1 M nitric and measured by ICP-MS. The method was evaluated by the analysis of NASS-5 seawater reference materials for trace metals. Good agreement was obtained for most metals, which indicates that by the proposed pretreatment using the synthesized resin, seawater samples can be favorably measured by ICP-MS.
开发了一种使用基于壳聚糖的螯合树脂——乙二胺 - N,N,N'-三乙酸型壳聚糖（EDTriA 型壳聚糖）的样品预处理方法，用于海水中痕量金属的预富集以及在通过电感耦合等离子体质谱法（ICP-MS）测定之前分离海水基质。该树脂在酸性介质中对过渡金属和稀土元素表现出非常好的吸附性，且不受碱金属和碱土金属的任何干扰。在所提出的方法中，使用了一份 50 mL、pH 为 4 的样品。吸附在树脂上的金属用 10 mL 1 M 的硝酸洗脱，并通过 ICP-MS 进行测定。通过对 NASS-5 海水痕量金属参考物质的分析对该方法进行了评估。大多数金属获得了良好的一致性，这表明通过使用合成树脂进行所提出的预处理，海水样品可以通过 ICP-MS 进行良好的测定。
