用于LA‐MC‐ICP‐MS铜同位素比测量的潜在新黄铜矿参考材料,Geostandards and Geoanalytical Research

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用于LA‐MC‐ICP‐MS铜同位素比测量的潜在新黄铜矿参考材料
Geostandards and Geoanalytical Research ( IF 2.7 ) Pub Date : 2021-01-11 , DOI: 10.1111/ggr.12372
Zhian Bao ₁ , Nan Lv ₁ , Kaiyun Chen ₁ , Yan Luan ₂ , Xiaohui Sun ₂ , Chunlei Zong ₁ , Honglin Yuan ₁

Affiliation

制备了一种新的天然黄铜矿参考材料TC1725，用于通过飞秒激光烧蚀多收集器电感耦合等离子体质谱法（fsLA-MC-ICP-MS）进行原位Cu同位素测量。详细的组织检查和主要元素确定表明，TC1725黄铜矿晶粒没有生长边缘或分区。基于大量溶液雾化器（SN）‐MC‐ICP‐MS，单粒SN‐MC‐ICP‐MS和fsLA‐MC‐ICP‐MS进行的大量测量，黄铜矿晶粒相对于Cu同位素而言是均匀的。传统的散装同位素分析由SN-MC-ICP-MS得到的平均δ ⁶⁵ -0.06±0.03‰的Cu值（2级小号，Ñ = 132）。TC1725的随机选择的单晶黄铜矿确定由SN-MC-ICP-MS，而不柱色谱法得到的平均δ ⁶⁵ -0.06±0.04‰（2级铜值小号，Ñ = 188）。四个测量阶段的中间测量精度均优于0.04‰（2 s），表明TC1725黄铜矿适合用作铜同位素测量的微分析参考材料。均值δ ⁶⁵通过fsLA-MC-ICP-MS测定的Cu值分析不同的个体黄铜矿支架和条带是-0.06±0.03‰（2级小号，Ñ = 393），具有不确定性内的散装同位素组成是一致的。推荐的平均δ ⁶⁵ 经批量SN-MC-ICP-MS测定，该黄铜矿标准物质的Cu值为-0.06±0.03‰（2 s，n = 132）。

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A Potential New Chalcopyrite Reference Material for LA‐MC‐ICP‐MS Copper Isotope Ratio Measurement

A new natural chalcopyrite reference material TC1725 is prepared for in situ Cu isotope measurement by femtosecond laser ablation multi‐collector inductively coupled plasma‐mass spectrometry (fsLA‐MC‐ICP‐MS). Detailed textural examination and major element determination suggest the TC1725 chalcopyrite grains have no growth rim or zoning. The chalcopyrite grain is homogeneous with respect to Cu isotopes based on a large number of measurements performed by bulk solution nebuliser (SN)‐MC‐ICP‐MS, single‐grain SN‐MC‐ICP‐MS and fsLA‐MC‐ICP‐MS. The traditional bulk isotope analyses by SN‐MC‐ICP‐MS yielded a mean δ⁶⁵Cu value of −0.06 ± 0.03‰ (2s, n = 132). Randomly selected single chalcopyrite grain of TC1725 determined by SN‐MC‐ICP‐MS without column chromatography gave a mean δ⁶⁵Cu value of −0.06 ± 0.04‰ (2s, n = 188). The intermediate measurement precision for four measurement sessions was better than 0.04‰ (2s), suggesting TC1725 chalcopyrite is suitable as a microanalysis reference material for Cu isotope measurement. The mean δ⁶⁵Cu value determined by fsLA‐MC‐ICP‐MS analyses on different individual chalcopyrite mounts and strips was −0.06 ± 0.03‰ (2s, n = 393), consistent with the bulk isotope composition within uncertainty. The recommended mean δ⁶⁵Cu value for this chalcopyrite reference material is −0.06 ± 0.03‰ (2s, n = 132) as determined by bulk SN‐MC‐ICP‐MS.

更新日期：2021-01-11

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