Reference material BCR-670 (Lemna minor, “duckweed”) is one of the very few plant reference materials for which certified data for all rare earths and yttrium (REY) are available. However, biological samples like plants or fungi often include detrital inorganic material because substrate particles (e.g., soil or atmospheric dust) may be closely associated with the organic component. Hence, the digestion approach used may strongly affect element yields. We here present concentration data for major, minor and trace elements with a focus on REY (with and without off-line preconcentration and matrix separation) following high-pressure high-temperature HNO₃-HCl-HF decomposition and low-pressure low-temperature HNO₃ extraction, respectively.

Rare earths and yttrium concentrations after HNO₃-HCl-HF decomposition are in good agreement with certified data but corroborate that preconcentration and matrix separation prior to quadrupole ICP-MS analyses result in improved data quality compared to data obtained without preconcentration and matrix separation. The results of both the decomposition and the extraction protocol show excellent reproducibilities, respectively, but the REY concentrations of the HNO₃ extractions are lower than the certified bulk data and are accompanied by considerably lower concentrations of Al, Zr and Th. This suggests that the HNO₃ extraction does not dissolve trace elements from detrital (alumino)silicate particles associated with the plant material.

Our results expand the existing data set for BCR-670 not only for REY but also for a range of other elements (e.g., Li, Co, Rb, Sr, Ba, Mg, Mn, Na, P) including elements for which no or hardly any information had hitherto been available. Therefore, our dataset helps to improve the overall characterisation of BCR-670.

The new data obtained from HNO₃ extraction may be used to assess analytical quality in studies focusing on the chemical composition of the biological component of plants and fungi, which is a prerequisite to quantify the bioavailability and bioaccumulation of trace elements such as the REY in plants and fungi.

参考材料 BCR-670（Lemna minor，“浮萍”）是极少数可提供所有稀土和钇 (REY) 认证数据的植物参考材料之一。然而，植物或真菌等生物样品通常包含碎屑无机材料，因为基质颗粒（例如土壤或大气灰尘）可能与有机成分密切相关。因此，所使用的消化方法可能会严重影响元素产量。我们在此提供主要、次要和痕量元素的浓度数据，重点是 REY（有和没有离线预浓缩和基质分离）在高压高温 HNO ₃ -HCl-HF 分解和低压低温之后HNO ₃萃取，分别。

HNO ₃ -HCl-HF 分解后的稀土和钇浓度与认证数据非常一致，但证实了四极杆 ICP-MS 分析之前的预浓缩和基质分离与未经预浓缩和基质分离的数据相比可提高数据质量。分解和萃取方案的结果分别显示出极好的重现性，但 HNO ₃萃取的 REY 浓度低于经认证的批量数据，并且伴随着相当低的 Al、Zr 和 Th 浓度。这表明 HNO ₃萃取不会从与植物材料相关的碎屑（铝）硅酸盐颗粒中溶解微量元素。

我们的结果扩展了 BCR-670 的现有数据集，不仅适用于 REY，还适用于一系列其他元素（例如，Li、Co、Rb、Sr、Ba、Mg、Mn、Na、P），包括没有或迄今为止几乎没有任何信息可用。因此，我们的数据集有助于改善 BCR-670 的整体特征。

从 HNO ₃提取中获得的新数据可用于评估关注植物和真菌生物成分化学成分的研究中的分析质量，这是量化植物中 REY 等微量元素的生物利用度和生物积累的先决条件和真菌。