Development of a Matrix-Matched Barite Reference Material (NWU-Brt) for Calibration of In Situ S Isotope Measurements by Laser Ablation Multi-Collector Inductively Coupled Plasma-Mass Spectrometry

IF 2.7 2区地球科学 Q2 GEOCHEMISTRY & GEOPHYSICS

Geostandards and Geoanalytical Research Pub Date : 2024-02-15 DOI:10.1111/ggr.12544

Nan Lv, Zhian Bao, Xiaojuan Nie, Kaiyun Chen, Yan Zhang, Honglin Yuan

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Abstract

A new matrix-matched reference material (NWU-Brt) with sulfur isotope ratios resembling those of natural barites has been developed for in situ S isotope measurements by laser ablation multi-collector inductively coupled plasma-mass spectrometry (LA-MC-ICP-MS). A 100 g quantity of natural barite crystal was milled to ultra-fine particles and sintered to a solid block using a fast hot-pressing sintering technique (FHPS). We report δ³⁴S ratios determined by isotope ratio mass spectrometry (IRMS), solution nebuliser multi-collector inductively coupled plasma-mass spectrometry (SN-MC-ICP-MS) and LA-MC-ICP-MS, involving up to six participating laboratories. The homogeneity of δ³⁴S ratios of the synthesised barite was tested by LA-MC-ICP-MS with an analytical spot size of 53 μm. The LA-MC-ICP-MS results show that NWU-Brt demonstrates a satisfactory homogeneous composition and is an appropriate material for calibrating δ³⁴S ratios in barite. IRMS and SN-MC-ICP-MS produced mean δ³⁴S values of +14.17 ± 0.42‰ (2s) and +14.27 ± 0.23‰ (2s), respectively. The results of LA-MC-ICP-MS analyses are consistent with the IRMS and SN-MC-ICP-MS ratios within uncertainty. Overall, our results confirm the suitability of NWU-Brt for the calibration of δ³⁴S ratios in barite using LA-MC-ICP-MS.

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开发基质匹配重晶石标准物质（NWU-Brt），用于校准激光烧蚀多收集器电感耦合等离子体质谱法的原位 S 同位素测量结果

为利用激光烧蚀多收集器电感耦合等离子体质谱法（LA-MC-ICP-MS）进行原位 S 同位素测量，开发了一种新的基质匹配参考材料（NWU-Brt），其硫同位素比与天然重晶石相似。将 100 克天然重晶石晶体碾磨成超细颗粒，并采用快速热压烧结技术（FHPS）烧结成固体块。我们报告了通过同位素比质谱法（IRMS）、溶液雾化器多收集器电感耦合等离子体质谱法（SN-MC-ICP-MS）和 LA-MC-ICP-MS 测定的 δ34S 比值，参与的实验室多达六个。用 LA-MC-ICP-MS 测试了合成重晶石的 δ34S 比率的均匀性，分析光斑尺寸为 53 μm。LA-MC-ICP-MS 结果表明，NWU-Brt 的均匀成分令人满意，是校准重晶石中 δ34S 比率的合适材料。IRMS 和 SN-MC-ICP-MS 产生的平均 δ34S 值分别为 +14.17 ± 0.42‰（2s）和 +14.27 ± 0.23‰（2s）。LA-MC-ICP-MS 分析的结果与 IRMS 和 SN-MC-ICP-MS 的比率一致，误差在不确定范围内。总之，我们的结果证实了 NWU-Brt 适用于利用 LA-MC-ICP-MS 标定重晶石中的δ34S 比值。

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来源期刊

Geostandards and Geoanalytical Research 地学-地球科学综合

CiteScore

7.10

自引率

18.40%

发文量

审稿时长

>12 weeks

期刊介绍： Geostandards & Geoanalytical Research is an international journal dedicated to advancing the science of reference materials, analytical techniques and data quality relevant to the chemical analysis of geological and environmental samples. Papers are accepted for publication following peer review.