The concentrations of dissolved yttrium and rare earth elements (REY) in sediment pore water provide important geochemical information. However, due to the low REY concentration, complex matrix, and limited sample volume (often only a few milliliters), analysis of the REY in pore water often is highly challenging. In this study, a method was established to determine the dissolved REY in pore water of marine sediments using an offline preconcentration step with the ethylenediaminetriacetate chelating resin, followed by inductively coupled plasma-mass spectrometry. In addition, using a commercially available automated trace-element preconcentration system, the preconcentration step can be fully automated, saving labor and providing a better control of the final elution volume. The experimental conditions (pH, elution volume, elution acid concentration, and organic complexation effect) were assessed, and the optimal conditions were chosen. In particular, the organic complexation effect was found to be negligible. The procedure blank and limit of detection were satisfactory for studying REY in pore water of marine sediments, and the method also yielded satisfactory recoveries for the REY elements (83–110%). The method was then applied to analyze the dissolved REY concentrations of pore water samples collected in a sediment core (~ 30 cm) in the central Indian Ocean. The vertical distribution, dissolved REY concentration, and the average Post Archean Australian Shale-normalized pattern of the REY showed similarities to the previously published pore water REY data. This method provides an accurate yet facile approach for the analysis of all 15 REY in marine pore water samples using the sample volume of only ~ 5 mL.

沉积物孔隙水中溶解的钇和稀土元素 (REY) 的浓度提供了重要的地球化学信息。然而，由于 REY 浓度低、基质复杂和样品体积有限（通常只有几毫升），孔隙水中的 REY 分析通常极具挑战性。在这项研究中，建立了一种方法来测定海洋沉积物孔隙水中溶解的 REY，使用离线预浓缩步骤与乙二胺三乙酸酯螯合树脂，然后是电感耦合等离子体质谱法。此外，使用市售的自动化微量元素预浓缩系统，预浓缩步骤可以完全自动化，节省劳动力并更好地控制最终洗脱体积。实验条件（pH、洗脱体积、洗脱酸浓度和有机络合效应）进行评估，并选择最佳条件。特别是，发现有机络合效应可以忽略不计。程序空白和检测限对于研究海洋沉积物孔隙水中的 REY 是令人满意的，并且该方法也对 REY 元素产生了令人满意的回收率 (83-110%)。然后将该方法应用于分析在印度洋中部沉积物岩心（~ 30 cm）中收集的孔隙水样品的溶解 REY 浓度。REY 的垂直分布、溶解的 REY 浓度和平均后太古代澳大利亚页岩归一化模式显示出与先前公布的孔隙水 REY 数据相似。