Spectrochimica Acta Part B: Atomic Spectroscopy最新文献

Assessment of acupuncture's effectiveness in treating gulf war illness using laser induced breakdown spectroscopy and inductively coupled plasma mass spectrometry 利用激光诱导击穿光谱法和电感耦合等离子体质谱法评估针灸治疗海湾战争疾病的效果

IF 3.2 2区化学 Q1 SPECTROSCOPY

Spectrochimica Acta Part B: Atomic Spectroscopy

Pub Date : 2024-11-15 DOI: 10.1016/j.sab.2024.107076

Kemal E. Eseller , Ali Safi , Helmar G. Adler , Lisa Conboy , Richard M. Gaschnig , Noureddine Melikechi

In an effort to contribute to define whether Gulf War Illness (GWI) has physiological aspects, we evaluated the effectiveness of acupuncture treatment by measuring blood plasma metal levels and comparing them to the McGill pain scores of 22 patients. We analyzed the blood plasma samples of 22 GWI patients who underwent 2 acupuncture treatments per week. We analyzed the blood metal levels of these patients at baseline and after 2 and 4 months of treatment with acupuncture using laser-induced breakdown spectroscopy (LIBS). Principal component analysis (PCA) loadings of the LIBS data revealed that emission lines of sodium, potassium, magnesium, and calcium were key features differentiating the two types of blood plasma samples. We also conducted inductively coupled plasma mass spectrometry (ICP-MS) measurements on the same samples and compared the findings to the McGill pain scores of the patients. Levels of sodium, potassium, magnesium, phosphorus, iron, copper, and zinc for all 22 patients were measured using ICP-MS. We observed after 2 and 4 months of acupuncture treatment, the Pearson correlation coefficient of the McGill pain score and the concentrations of phosphorus (P), and zinc (Zn), exhibit a moderate positive correlation with changes in the McGill pain score, with Pearson correlation coefficients of 47 % (p = 0.026) for the 0–2-month period, 45 % (p = 0.038) for the 0–4-month period, and 42 % (p = 0.05) for the 0–2-month period, respectively. Sodium (Na) exhibits a nearly moderate correlation, with a Pearson coefficient of 39 % and a p-value of 0.07. Our result suggests a potential link between element concentrations, acupuncture treatment and pain response.

为了帮助确定海湾战争疾病（GWI）是否与生理因素有关，我们通过测量血浆金属水平并将其与 22 名患者的麦吉尔疼痛评分进行比较，评估了针灸治疗的效果。我们分析了 22 名每周接受 2 次针灸治疗的 GWI 患者的血浆样本。我们使用激光诱导击穿光谱法（LIBS）分析了这些患者在基线以及接受针灸治疗 2 个月和 4 个月后的血液金属含量。激光诱导击穿光谱数据的主成分分析（PCA）载荷显示，钠、钾、镁和钙的发射线是区分两种血浆样本的关键特征。我们还对相同的样本进行了电感耦合等离子体质谱（ICP-MS）测量，并将测量结果与患者的麦吉尔疼痛评分进行了比较。我们使用 ICP-MS 测量了所有 22 名患者体内钠、钾、镁、磷、铁、铜和锌的含量。我们观察到，针灸治疗 2 个月和 4 个月后，麦吉尔疼痛评分与磷（P）和锌（Zn）浓度的皮尔逊相关系数与麦吉尔疼痛评分的变化呈中度正相关，0-2 个月的皮尔逊相关系数为 47 %（P = 0.0-2个月的皮尔逊相关系数分别为 47% (p = 0.026)，0-4个月的皮尔逊相关系数分别为 45% (p = 0.038)，0-2个月的皮尔逊相关系数分别为 42% (p = 0.05)。钠（Na）的相关性接近中等，皮尔逊系数为 39%，p 值为 0.07。我们的研究结果表明，元素浓度、针灸治疗和疼痛反应之间存在潜在联系。

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引用次数: 0

Characterization of the distribution of mineral elements in chromium-stressed rice (Oryza sativa L.) leaves based on laser-induced breakdown spectroscopy and data augmentation 基于激光诱导击穿光谱和数据增强的铬胁迫水稻（Oryza sativa L.）叶片中矿物质元素的分布表征

IF 3.2 2区化学 Q1 SPECTROSCOPY

Spectrochimica Acta Part B: Atomic Spectroscopy

Pub Date : 2024-11-07 DOI: 10.1016/j.sab.2024.107072

Jiyu Peng , Longfei Ye , Yifan Liu , Fei Zhou , Linjie Xu , Fengle Zhu , Jing Huang , Fei Liu

The fast and precise visualization of mineral elements in contaminated plants is crucial for understanding nutrient dynamics, plant health, and environmental monitoring. In this study, a Wasserstein generative adversarial network (WGAN) is proposed to expand the data scale and combines laser-induced breakdown spectroscopy (LIBS) with three machine learning methods for mineral elements analysis in Cr-stressed rice (Oryza sativa L.) leaves. In the quantitative analysis of mineral elements, the proposed method improved the prediction performance for Cu, K, Mg, Mn, and Na, except for Ca and Fe, demonstrating the effectiveness of data augmentation in enhancing the quantitative models. Mapping the distribution of Ca, Fe, Mg, K, Mn, and Na in rice leaves shows higher concentrations towards the apical regions and approximately symmetrical distribution along the leaf vein. Additionally, Fe, K, and Mn concentrations are significantly lower in Cr-polluted leaves compared to uncontaminated leaves. These preliminary findings offer insights into the macro distribution of mineral elements in plants.

快速、精确地可视化受污染植物中的矿物元素对于了解养分动态、植物健康和环境监测至关重要。本研究提出了一种 Wasserstein 生成式对抗网络（WGAN）来扩大数据规模，并将激光诱导击穿光谱（LIBS）与三种机器学习方法相结合，用于分析受铬胁迫的水稻（Oryza sativa L.）叶片中的矿物元素。在矿物元素定量分析中，除 Ca 和 Fe 外，所提出的方法提高了 Cu、K、Mg、Mn 和 Na 的预测性能，证明了数据扩增在增强定量模型方面的有效性。绘制的水稻叶片中 Ca、Fe、Mg、K、Mn 和 Na 的分布图显示，叶片顶端区域的浓度较高，且沿叶脉大致对称分布。此外，与未受污染的叶片相比，受铬污染的叶片中铁、钾和锰的浓度明显较低。这些初步发现有助于深入了解植物中矿物质元素的宏观分布。

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引用次数: 0

Rapid determination of 90Sr in seawater using a novel porous crown-based resin and tandem quadrupole ICP-MS/MS in cool plasma and O2-He mode 利用新型多孔冠基树脂和冷等离子体及 O2-He 模式串联四极杆 ICP-MS/MS 快速测定海水中的 90Sr

IF 3.2 2区化学 Q1 SPECTROSCOPY

Spectrochimica Acta Part B: Atomic Spectroscopy

Pub Date : 2024-11-05 DOI: 10.1016/j.sab.2024.107071

Xingchen Liu , Yin Su , Feng Zhang , Jie Chen , Chenyang Peng , Kesheng Hu , Yiman Lu , Jing Lin , Shan Xing , Keliang Shi , Xiaolin Hou

There has been an increasing need for the rapid and automated analysis of ⁹⁰Sr in seawater for the purpose of radiological assessment and emergency response after the FDNPP accident. In this work, a rapid method for the determination of ⁹⁰Sr in seawater was established using ICP-MS/MS with cool plasma and collision-reaction gases combined with a new porous crown-based resin separation. A nanofiltration membrane was applied to rapidly pre-treat seawater samples within 3 min and remove most of the matrix components from 500 mL to 250 mL for the first time. A comprehensive investigation was performed to study the extraction behaviors of Sr, Zr, Ge, Y and matrix elements on the new resin, showing an excellent separation efficiency (> 10³) using a U-shaped resin column. Based on their different first ionization potentials, the ⁹⁰Zr⁺ and ⁸⁹Y⁺ interferences were completely eliminated under cool plasma conditions. The interferences of ⁷⁴Ge¹⁶O⁺ and ⁸⁸Sr were effectively suppressed by using 2 mL/min He-0.3 mL/min O₂ as the collision and reaction gases in the dynamic collision/reaction cell. Combined with chemical separation, the overall decontamination factors of Zr, GeO and Y were 1.9 × 10¹⁰, 6.9 × 10⁷ and 6.9 × 10⁷ respectively, and ⁸⁸Sr¹H₂⁺ tailing was reduced by more than 200 times compared to a conventional ICP-MS. A detection limit of 4.6 pg/L (24.0 Bq/L) for ⁹⁰Sr was achieved with a sample analysis turn-around time of 6 h for a set of 12 samples. The method was validated by analyzing spiked seawater samples.

FDNPP 事故发生后，为了进行辐射评估和应急响应，对海水中 90Sr 快速自动分析的需求日益增加。在这项工作中，利用冷等离子体和碰撞反应气体ICP-MS/MS，结合新型多孔冠基树脂分离，建立了一种快速测定海水中90Sr的方法。应用纳滤膜可在 3 分钟内对海水样品进行快速预处理，并首次将 500 mL 样品中的大部分基质成分去除至 250 mL。对 Sr、Zr、Ge、Y 和基体元素在新型树脂上的萃取行为进行了全面研究，结果表明，使用 U 型树脂柱可获得极佳的分离效率（> 103）。基于它们不同的第一电离电位，在冷等离子体条件下，90Zr+ 和 89Y+ 的干扰被完全消除。在动态碰撞/反应池中使用 2 mL/min He-0.3 mL/min O2 作为碰撞和反应气体，可有效抑制 74Ge16O+ 和 88Sr 的干扰。结合化学分离，与传统的 ICP-MS 相比，Zr、GeO 和 Y 的总体净化系数分别为 1.9 × 1010、6.9 × 107 和 6.9 × 107，88Sr1H2+ 尾气减少了 200 多倍。一组 12 个样品的分析周转时间为 6 小时，90Sr 的检测限为 4.6 pg/L（24.0 Bq/L）。通过分析加标海水样品，对该方法进行了验证。

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引用次数: 0

Consideration of spectral interference in total reflection X-ray fluorescence analysis using a limited number of calibration samples: Case study of ocean polymetallic nodules 利用数量有限的校准样品考虑全反射 X 射线荧光分析中的光谱干扰：海洋多金属结核案例研究

IF 3.2 2区化学 Q1 SPECTROSCOPY

Spectrochimica Acta Part B: Atomic Spectroscopy

Pub Date : 2024-11-05 DOI: 10.1016/j.sab.2024.107070

Alena N. Zhilicheva , Galina V. Pashkova , Victor M. Chubarov , Artem S. Maltsev , Dmitry Kirsanov , Vitaly Panchuk

A novel approach for quantitative analysis in total-reflection X-ray fluorescence (TXRF) which can be employed for the samples with complex matrices inducing overlapping spectral signals in the scenario of limited availability of standard samples is proposed. The approach is based on the least squares (LS) decomposition of real spectra into the weighted sum of simulated individual element subspectra and requires only a single sample of matrix-matched reference material. Oceanic polymetallic nodules and crusts, having complex mineral matrix and containing high concentrations of overlapping elements, were chosen to demonstrate the feasibility of the approach in quantification of 11 elements. The comparison of the results obtained with LS decomposition, internal standard and linear calibration with three standard samples was performed. It was demonstrated that the performance of the proposed approach and of the linear calibration was better than that of internal standard for most of the elements; however, the proposed method requires only a single standard sample.

本文提出了一种新的全反射 X 射线荧光定量分析方法，该方法可用于在标准样品有限的情况下，对具有复杂基质、诱发重叠光谱信号的样品进行定量分析。该方法基于将真实光谱分解为模拟单个元素子光谱的加权和的最小二乘法（LS），并且只需要一个与基质匹配的参考材料样品。海洋多金属结核和结壳具有复杂的矿物基质，并含有高浓度的重叠元素。比较了 LS 分解法、内标法和使用三种标准样品进行线性校准所获得的结果。结果表明，就大多数元素而言，拟议方法和线性校准的性能优于内标法；不过，拟议方法只需要一个标准样品。

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引用次数: 0

Signal enhancement with double-pulse LIBS on biological samples and better discrimination of tissues through machine learning algorithms 在生物样品上使用双脉冲 LIBS 增强信号，并通过机器学习算法更好地分辨组织

IF 3.2 2区化学 Q1 SPECTROSCOPY

Spectrochimica Acta Part B: Atomic Spectroscopy

Pub Date : 2024-11-02 DOI: 10.1016/j.sab.2024.107063

Elena Ramela Ciobotea , Cristian Sarpe , Bastian Zielinski , Hendrike Braun , Arne Senftleben , Soumi Dutta , Georg Mayer , Camilo Florian , Thomas Baumert

Laser-induced breakdown spectroscopy (LIBS) is a widely used technique in the field of spectroscopy, enabling the determination of the chemical composition of a variety of samples using typically single laser pulses. This paper presents the successful integration of femtosecond LIBS using double pulses that combined with machine learning algorithms enhanced the discrimination between two animal tissue types (liver and muscle) through the detection of atomic and molecular emissions. The double-pulse configuration was optimized on liver tissue, and the results demonstrated that at 1100 ps pulse delay, the signal was the highest overall for all identified lines, with a fivefold increase compared to single-pulse configuration at comparable energies. By employing femtosecond double-pulse LIBS, it is possible to achieve enhanced signal quality with a better signal-to-noise ratio. Both algorithms used here (Artificial Neural Network and Random Forest) consequently demonstrate superior performance in tissue type prediction when double pulses are employed, as compared to single pulses. The combination of femtosecond double-pulse LIBS with machine learning algorithms has the potential to be an effective technique for thin biological samples (for example biopsy sections), with minimal ablation.

激光诱导击穿光谱（LIBS）是光谱学领域广泛使用的一种技术，通常使用单激光脉冲就能测定各种样品的化学成分。本文介绍了飞秒激光击穿光谱与双脉冲的成功集成，它与机器学习算法相结合，通过检测原子和分子发射，增强了对两种动物组织类型（肝脏和肌肉）的分辨能力。在肝脏组织上对双脉冲配置进行了优化，结果表明，在 1100 ps 脉冲延迟时，所有识别线的信号总体最高，在可比能量下比单脉冲配置增加了五倍。通过采用飞秒双脉冲 LIBS，可以获得信噪比更高的信号质量。因此，与单脉冲相比，在采用双脉冲时，这里使用的两种算法（人工神经网络和随机森林）在组织类型预测方面都表现出更优越的性能。飞秒双脉冲 LIBS 与机器学习算法的结合有可能成为一种有效的技术，可用于薄生物样本（例如活检切片），且烧蚀程度极低。

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引用次数: 0

LIBS plasma diagnostics with SuperCam on Mars: Implications for quantification of elemental abundances 利用超级相机对火星上的 LIBS 等离子体进行诊断：对元素丰度量化的影响

IF 3.2 2区化学 Q1 SPECTROSCOPY

Spectrochimica Acta Part B: Atomic Spectroscopy

Pub Date : 2024-11-01 DOI: 10.1016/j.sab.2024.107061

H.T. Manelski , R.C. Wiens , B. Bousquet , P.B. Hansen , S. Schröder , S. Clegg , N.D. Martin , A.E. Nelson , R.K. Martinez , A.M. Ollila , A. Cousin

The Perseverance rover landed in Jezero Crater, Mars, in 2021 to explore an ancient delta for signs of past life and collect samples for a future Mars Sample Return Mission. SuperCam, onboard Perseverance, uses Laser Induced Breakdown Spectroscopy (LIBS) to quantify the elements in the rocks/soils encountered along the rover's traverse. LIBS is desirable for planetary science missions because of its effectiveness at a distance and with different target types (rock, soil, etc). However, decreased laser irradiance with distance and changing coupling efficiency in different targets could cause the physical conditions of the plasma plume to vary, with important implications for SuperCam's elemental calibration. This study examines the characteristics of laser-induced plasmas on Mars by estimating apparent temperature via the multiline Boltzmann plot method and electron density using Stark broadening of the H-α line. We find that apparent plasma temperatures do not decrease with distance or vary systematically with target type (rock vs soil). The variability in plasma temperatures seen on Mars is fully represented in the laboratory dataset used for SuperCam's elemental calibration, which suggests that our elemental calibration is likely robust against observed changes in apparent plasma temperature. These results imply that SuperCam can make reliable LIBS observations to at least 8 m. Estimated electron density is 1.4× higher in soils than rock targets, which is likely related to the dependence of the H-α line on topographic relief, a poorly understood mechanism which contributes to the difficulty of quantifying hydrogen abundance in Mars spectra.

毅力号 "漫游车于 2021 年在火星杰泽罗陨石坑着陆，探索一个古老的三角洲，寻找过去生命的迹象，并为未来的火星采样返回任务采集样本。毅力号 "上的 "超级相机 "利用激光诱导击穿光谱仪（LIBS）对漫游车穿越过程中遇到的岩石/土壤中的元素进行量化。激光诱导击穿光谱仪在行星科学任务中是非常理想的，因为它在远距离和不同目标类型（岩石、土壤等）下都很有效。然而，激光辐照度随距离的增加而降低，不同目标的耦合效率也在变化，这些都可能导致等离子体羽流的物理条件发生变化，从而对 SuperCam 的元素校准产生重要影响。本研究通过多线玻尔兹曼图法估算表观温度，并利用 H-α 线的斯塔克展宽法估算电子密度，研究了火星上激光诱导等离子体的特征。我们发现表观等离子体温度不会随着距离的增加而降低，也不会随着目标类型（岩石与土壤）的不同而发生系统性变化。火星上等离子体温度的变化在用于 SuperCam 元素校准的实验室数据集中得到了充分体现，这表明我们的元素校准可能对观测到的视等离子体温度变化具有稳健性。土壤中的估计电子密度比岩石目标中的高 1.4 倍，这可能与 H-α 线对地形起伏的依赖性有关，这种机制还不太清楚，导致火星光谱中氢丰度难以量化。

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引用次数: 0

Outside Front Cover - Journal name, Cover image, Volume issue details, ISSN, Cover Date, Elsevier Logo and Society Logo if required 封面外侧 - 期刊名称、封面图片、卷期详情、ISSN、封面日期、爱思唯尔徽标和学会徽标（如需要

IF 3.2 2区化学 Q1 SPECTROSCOPY

Spectrochimica Acta Part B: Atomic Spectroscopy

Pub Date : 2024-11-01 DOI: 10.1016/S0584-8547(24)00209-X

引用次数: 0

Diffraction peak identification and correction in EDXRF spectroscopy 电离辐射 X 射线荧光光谱中的衍射峰识别和校正

IF 3.2 2区化学 Q1 SPECTROSCOPY

Spectrochimica Acta Part B: Atomic Spectroscopy

Pub Date : 2024-11-01 DOI: 10.1016/j.sab.2024.107060

Said Sadeg , Jean Cauzid , Cécile Fabre , El-Hadi Djermoune

Energy dispersive X-ray fluorescence (EDXRF) spectroscopy is an analytical technique often used to create maps of the elemental chemical composition. The fluorescence signal can be influenced by X-ray diffraction peaks, a phenomenon that can lead to difficulties or errors in interpreting spectral peaks. However, diffraction can also be useful if we successfully separate it from the fluorescence signal. In this paper, we propose different methods to deal with the diffraction peaks by using the signals obtained from a spectrometer equipped with two detectors. These methods were tested on a thin section of a rock sample to show their effectiveness in processing diffraction peaks. Each method showed its ability to deal with the diffraction peaks in a more or less effective way and each has its own limitations. The latter have to be taken into account when analyzing the EDXRF signal, whether in a geological context or in any other context.

能量色散 X 射线荧光 (EDXRF) 光谱法是一种常用于绘制元素化学成分图的分析技术。荧光信号可能会受到 X 射线衍射峰的影响，这种现象可能会导致光谱峰解释困难或错误。不过，如果我们能成功地将衍射与荧光信号分离，衍射也是有用的。在本文中，我们提出了不同的方法，利用配备两个探测器的光谱仪获得的信号来处理衍射峰。我们在岩石样品的薄片上对这些方法进行了测试，以显示它们在处理衍射峰方面的有效性。每种方法都能或多或少地有效处理衍射峰，而且每种方法都有自己的局限性。在分析电离辐射 X 射线荧光信号时，无论是在地质方面还是在任何其他方面，都必须考虑到后者。

引用次数: 0

Multi-dimensional analysis of NiCr alloy nanofilms based on Ps-LIBS technology 基于 Ps-LIBS 技术的镍铬合金纳米薄膜多维分析

IF 3.2 2区化学 Q1 SPECTROSCOPY

Spectrochimica Acta Part B: Atomic Spectroscopy

Pub Date : 2024-10-31 DOI: 10.1016/j.sab.2024.107062

Yingying Liu , Chuanqi Wu , Lili Dong , Junshan Xiu

With the rapid development of thin film materials, NiCr alloy nanofilms have a very wide range of applications in many fields due to their excellent properties. In this paper, NiCr alloy nanofilms with different NiCr content ratios were prepared using electron beam evaporation technology. The calibration curves of the Ni / Cr content ratio and the corresponding spectral line intensity ratio of the thin film samples were plotted. The linear fitting coefficient (RZhou and Tian (2005) [2]) of this calibration curve reached 0.99, which had a good linear fitting degree. The quantitative analysis of NiCr alloy thin film samples was carried out by Picosecond Laser Induced Breakdown Spectroscopy (Ps-LIBS). Calculated using the Boltzmann method and the Stark broadening method, the plasma electron temperature (T) was about 7048 K and the electron density (Ne) was about 6.08 × 10¹⁶ cm⁻³, and then the plasma characteristics of Ps-LIBS technology were preliminarily studied. In order to further realize the analysis of thin film samples, the depth profile of thin film samples was preliminary analyzed using the Ps-LIIBS technology and the thickness of a single laser pulse ablation was about 75 nm, which could be used to evaluate the thickness of the thin films. All the results show that Ps-LIBS technology can be used to realize the quantitative and quantitative analyses of NiCr alloy nanofilms prepared using the electron beam evaporation technology, which provides technical support for exploring the application potential of NiCr alloy nanofilms in practice.

随着薄膜材料的快速发展，镍铬合金纳米薄膜因其优异的性能在许多领域都有非常广泛的应用。本文利用电子束蒸发技术制备了不同镍铬含量比的镍铬合金纳米薄膜。绘制了镍/铬含量比和薄膜样品相应光谱线强度比的校准曲线。该校正曲线的线性拟合系数（RZhou 和 Tian (2005) [2]）达到 0.99，具有良好的线性拟合度。采用皮秒激光诱导击穿光谱法（Ps-LIBS）对镍铬合金薄膜样品进行定量分析。通过波尔兹曼法和斯塔克展宽法计算，等离子体电子温度（T）约为 7048 K，电子密度（Ne）约为 6.08 × 1016 cm-3，初步研究了 Ps-LIBS 技术的等离子体特性。为了进一步实现对薄膜样品的分析，利用 Ps-LIIBS 技术初步分析了薄膜样品的深度剖面，单个激光脉冲烧蚀的厚度约为 75 nm，可用于评估薄膜的厚度。所有结果表明，Ps-LIBS 技术可用于实现对电子束蒸发技术制备的镍铬合金纳米薄膜的定量定性分析，为探索镍铬合金纳米薄膜在实践中的应用潜力提供了技术支持。

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引用次数: 0

Semi-quantitative μLIBS mapping of germanium diffusion between metal and silicate during planetary core–mantle segregation 行星核幔分离过程中锗在金属和硅酸盐之间扩散的半定量μLIBS绘图

IF 3.2 2区化学 Q1 SPECTROSCOPY

Spectrochimica Acta Part B: Atomic Spectroscopy

Pub Date : 2024-10-24 DOI: 10.1016/j.sab.2024.107059

Baptiste Le Bellego , Vincent Motto-Ros , Béatrice Luais , Cécile Fabre , Célia Dalou , Pierre Condamine , Laurent Tissandier

Understanding the distribution of elements between the cores and mantles of planetary bodies is essential for elucidating the geological and geochemical processes operating during their formation. Because the semi-metallic element Ge shows complex siderophile, chalcophile, and lithophile properties, it is particularly significant for investigating core–mantle segregation and ore deposit formation. Recent advancements in in situ microanalysis techniques, such as μLIBS, have enabled high-resolution elemental mapping of Ge and other trace elements.

This study explores the application of μLIBS imaging to investigate the high-temperature/high-pressure distribution of Ge between metallic and silicate matrices analogous to planetary cores and mantles. By cross-calibrating the μLIBS intensities with electron microprobe profile analyses carried out on piston cylinder experimental samples, we produced semi-quantitative Ge maps from which we extracted Ge concentration profiles to assess Ge diffusion from the silicate to the metal. We determined, for the first time, the diffusion coefficient of Ge between metal and silicate to be D(Ge)_metal = 4.03E−13 ± 3.6E−14 m²/s at 1 GPa and 1350 °C. Our results demonstrate the capability and efficiency of μLIBS for providing detailed, high-resolution (15 μm) trace element concentration data at few ppm levels, offering a time- and cost-effective alternative to conventional techniques.

These findings bring insights on planetesimal differentiation and on chemical exchanges between metal and silicate phases in a magma ocean and between two different metal phases occurring at the bottom of the magma ocean during planetesimal formation.

了解行星体内核和外幔之间的元素分布对于阐明行星体形成过程中的地质和地球化学过程至关重要。由于半金属元素 Ge 具有复杂的亲铁、亲镓和亲岩特性，因此对研究星核-星幔分离和矿床形成具有特别重要的意义。μLIBS等原位显微分析技术的最新进展实现了对Ge和其他痕量元素的高分辨率元素绘图。本研究探索了如何应用μLIBS成像技术来研究Ge在金属和硅酸盐基质之间的高温/高压分布，类似于行星的内核和地幔。通过将μLIBS强度与活塞圆柱体实验样品上进行的电子微探针剖面分析进行交叉校准，我们绘制了半定量的Ge图，并从中提取了Ge浓度剖面，以评估Ge从硅酸盐向金属的扩散情况。我们首次测定了在 1 GPa 和 1350 °C 条件下，金属和硅酸盐之间的 Ge 扩散系数为 D(Ge)metal = 4.03E-13 ± 3.6E-14 m2/s。我们的研究结果表明，μLIBS 能够有效地提供详细的、高分辨率（15 μm）的痕量元素浓度数据，其浓度仅为几百万分之几，为传统技术提供了一种省时、经济的替代方法。这些发现为行星分化、岩浆洋中金属相和硅酸盐相之间的化学交换以及行星形成过程中岩浆洋底部发生的两种不同金属相之间的化学交换带来了启示。

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引用次数: 0