Measurement of Platinum Group Element (PGE: Ru, Rh, Pd, Os, Ir, and Pt) and Rhenium (Re) in environmental samples is a difficult task due to their ultra-trace level concentrations, and these metals suffer from severe isobaric and polyatomic interference. These kinds of issues have been solved for environmental samples having simple matrices such as tunnel dust and moss. However, a scope of improvement still exists in challenging sample matrices such as road dust, soil, and rocks. In this study, a method that enables measurement of PGE and Re mass fractions in road dust and rock samples is proposed. The method involves matrix removal using a cation-exchange column followed by measurement using inductively coupled plasma tandem mass spectrometry (ICP-MS/MS, also known as ICP- QQQ-MS) with 10% NH₃ in He as reactive gas in Collision/Reaction Cell. This study emphasizes that the usage of a simple cation-exchange column is an important step over the framework developed by Suoranta et al., 2012, which was developed to measure PGE and Re fractions in environmental samples having a simpler matrix such as moss samples. The method combines high pressure (130 bars) and high temperature (220 °C) digestion procedure in combination with isotope dilution (ID) as a calibration strategy, PGE and Re separation using cation exchange resin, and their measurements using ICP-MS/MS. The method was validated with road dust (BCR-723) and ultramafic komatiite (OKUM) having a complex matrix. The measured PGE and Re mass fractions of the two-measured reference material show excellent agreement with their certified values and have intermediate precisions ranging from 0.4–7.7% RSD. We conclude that the combination of single-stage cation-exchange chromatography with ID-ICP-MS/MS measurements enables measurement results with uncertainties fit for purpose for PGE and Re mass fractions in environmental samples with a complex matrix.

由于环境样品中的痕量铅含量超标，因此测量环境样品中的铂族元素（PGE：Ru，Rh，Pd，Os，Ir和Pt）和（（Re）是一项艰巨的任务，并且这些金属会遭受严重的同压和多原子干扰。对于具有简单基质（例如隧道灰尘和苔藓）的环境样品，已经解决了此类问题。但是，在具有挑战性的样品矩阵（如道路灰尘，土壤和岩石）中仍存在改进的范围。在这项研究中，提出了一种能够测量道​​路灰尘和岩石样品中PGE和Re质量分数的方法。该方法包括使用阳离子交换柱去除基质，然后使用含10％NH _3的电感耦合等离子体串联质谱法（ICP-MS / MS，也称为ICP-MS / MS）进行测量在氦气中作为碰撞/反应池中的反应气体。这项研究强调，使用简单的阳离子交换柱是Suoranta等人（2012）开发的框架的重要一步，该框架旨在测量具有较简单基质的环境样品（例如苔藓样品）中的PGE和Re分数。该方法结合了高压（130 bar）和高温（220°C）消解步骤，结合同位素稀释（ID）作为校准策略，使用阳离子交换树脂进行PGE和Re分离，以及使用ICP-MS / MS进行测量。道路尘埃（BCR-723）和具有复杂基质的超镁铁矿科玛铁矿（OKUM）验证了该方法的有效性。两次测量的参考物质的PGE和Re质量分数显示出与其认证值的极佳一致性，且中间精度的相对标准偏差为0.4-7.7％。我们得出结论，将单级阳离子交换色谱法与ID-ICP-MS / MS测量结合使用可使不确定性的测量结果适合复杂基质环境样品中的PGE和Re质量分数。