Here we report a novel and simple chromatographic procedure, involving the use of a single column packed with AGMP-50 cation-exchange resin, for separating Fe from geological matrices. This procedure was found to be suitable for both routine samples and samples with high contents of Cu. In our experiment, high-field-strength elements (HFSEs) and Al were first eluted using 4 mL of a mixture of 0.2 M HCl and 0.3 M HF, and then Fe was collected by using 6 mL of a mixture of 0.2 M HCl and 0.5 M HF. The residual matrix elements, such as Na, Mg, K, Ca and other trace elements, could not be eluted by such a mixture of dilute HF–HCl solutions, which enabled us to remove matrix elements effectively and enabled a recovery of Fe of close to 100%. The robustness of this procedure was further evaluated by carrying out replicated analyses of a series of geological reference materials, including basic rocks, intermediate rock, acidic rock and Mn-nodules. All of the Fe isotopic analytical results were, within analytical uncertainties, essentially identical with the data published previously. Therefore, this method may be a great option for purifying Fe from geological samples for isotopic analysis.

中文翻译：

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使用MC-ICP-MS从地质材料中分离铁进行同位素分析的新方法

在这里，我们报告了一种新颖而简单的色谱方法，包括使用装有AGMP-50阳离子交换树脂的单柱从地质基质中分离铁。发现该方法既适用于常规样品，也适用于铜含量高的样品。在我们的实验中，首先使用4 mL的0.2 M HCl和0.3 M HF的混合物洗脱高场强元素（HFSE）和Al，然后使用6 mL的0.2 M HCl和Al的混合物收集Fe。 0.5 M HF。残留的基质元素（如Na，Mg，K，Ca和其他痕量元素）无法通过这种稀HF-HCl溶液的混合物洗脱，这使我们能够有效地去除基质元素并回收近乎纯净的Fe。到100％通过对一系列地质参考材料（包括基本岩石，中间岩石，酸性岩石和Mn结核）进行重复分析，进一步评估了该程序的鲁棒性。在分析不确定性范围内，所有铁同位素分析结果与先前发表的数据基本相同。因此，该方法可能是从地质样品中纯化铁用于同位素分析的理想选择。