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Non-Destructive Micro X-Ray Fluorescence Quantitative Analysis Of Geological Materials 地质材料无损微x射线荧光定量分析
IF 3.4 2区 化学 Q2 Chemistry Pub Date : 2022-09-28 DOI: 10.46770/as.2022.112
Jinhua Li
: Micro X-ray fluorescence (µXRF) is an atomic spectroscopy for analyzing micro areas of a sample using Xray beams and mapping elemental distribution on the sample by spectrum acquisition at individual pixel positions. We have examined the potential of rapid and non-destructive µXRF analysis to quantitatively determine the chemical composition of geological samples by correcting standardless fundamental parameters (SFP) quantification data. Based on analysis and comparison of a set of certified international standard silicate glass, linear relationships between μXRF SFP quantification data and certified values of Na 2 O, MgO, Al 2 O 3 , SiO 2 , K 2 O, CaO, TiO 2 , MnO, and FeO were developed, and the corresponding calibration equations were calculated. Further tests on flat or uneven homogeneous glass demonstrated that calibrated results of all major elements were similar with certified values, with improved accuracy of ~10%. Analysis of typical geological materials, including pure minerals, heterogeneous basaltic rock, and micro areas, indicated calibrated results were closer to certified/reference values for most elements. This study reveals that µXRF is a promising technique for rapid, non-destructive, and quantitative investigation of chemical composition of specimens at the microscale level. µXRF measurements and calibration equations developed in this study could be used to rapidly characterize geological materials and non-destructively analyze precious extraterrestrial materials.
微x射线荧光(µXRF)是一种原子光谱学,用于使用x射线光束分析样品的微区域,并通过在单个像素位置的光谱采集来绘制样品上的元素分布。我们已经研究了快速和非破坏性的微XRF分析的潜力,通过校正无标准基本参数(SFP)定量数据来定量确定地质样品的化学成分。在对一套国际认证标准硅酸盐玻璃进行分析比较的基础上,建立了μXRF SFP定量数据与na2o、MgO、al2o3、sio2、k2o、CaO、tio2、MnO和FeO认证值之间的线性关系,并计算了相应的校准方程。对平面或不均匀玻璃的进一步测试表明,所有主要元素的校准结果与认证值相似,精度提高了~10%。对典型地质材料(包括纯矿物、非均质玄武岩和微区)的分析表明,校准结果更接近大多数元素的认证/参考值。这项研究表明,微XRF是一种很有前途的技术,可以在微尺度上快速、无损、定量地研究样品的化学成分。本研究开发的µXRF测量和校准方程可用于快速表征地质材料和无损分析珍贵的地外物质。
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引用次数: 2
Radiocarbon Sample Preparation Based On The Flam-Sealed Zn/Fe Reduction Method In Accelerator Mass Spectrometry Analysis 加速器质谱分析中基于火焰密封Zn/Fe还原法的放射性碳样品制备
IF 3.4 2区 化学 Q2 Chemistry Pub Date : 2022-09-28 DOI: 10.46770/as.2022.121
Shenghua Liu
: An alternative radiocarbon sample preparation with the flame-sealed Zn/Fe reduction method by removing the reagent of TiH 2 was developed, and the specifications and practices are described in detail. The graphitization parameters were optimized with 5 mg Fe powder (-325 mesh; H 2 -reduced spherical particles) as the catalyst, 15 mg Zn dust as the sole reductant and a reduction temperature of 500 °C for 3 h, followed by 550 °C for 4 h. The μm-scale morphology indicated that the spherical Fe particles were coated with a mix of graphite sheets and fuzz carbon. Simultaneously, SEM–EDS, XRD and XPS verified that the graphite-Fe target consisted of mostly graphitizable semidisordered carbon and Zn-Fe crystals, with minimal amounts of ZnO and Fe 3 ZnC crystals, which jointly ensured good performance (high and stable ion current output and good thermal conductivity) during the AMS measurements. The average fraction modern values of the SRM OX-II (consensus value, Fm=1.3407 ± 0.0019) and SRM IAEA-C7 (consensus value, Fm=0.4953 ± 0.0012) samples prepared from 2017 to present were 1.3403 ± 0.0058 (n=73) and 0.4964 ± 0.0031 (n=18), respectively. Thus, the long-term precision of the Zn/Fe sealed tube method was better than 6‰ and good accuracy was achieved over several years. The average background 14 C age of inorganic material was 43392 ± 1489 yr BP (n=44), and the ages of two 14 C-free organic materials were 45285 ± 2016 yr BP (n=15) and 46388 ± 2306 yr BP (n=36), indicating that low and stable carbon contamination levels were maintained throughout the entire chemical preparation process and AMS measurement over the last couple of years. The consistency between measured values and preferential values makes us confident in the preparation of various types of natural samples at normal mass size with our established vacuum line using the flame-sealed Zn/Fe reduction method.
:开发了一种用火焰密封Zn/Fe还原法去除TiH2试剂制备放射性碳样品的替代方法,并详细描述了其规范和实践。石墨化参数以5mg Fe粉末(-325目;H2还原的球形颗粒)为催化剂,15mg Zn粉为唯一还原剂,还原温度为500℃,持续3h,然后为550℃,持续4h。同时,SEM–EDS、XRD和XPS验证了石墨Fe靶主要由可石墨化的半等序碳和Zn-Fe晶体组成,其中ZnO和Fe3-ZnC晶体含量最低,这共同确保了AMS测量过程中的良好性能(高稳定的离子电流输出和良好的热导率)。2017年至今制备的SRM OX-II(一致值,Fm=1.3407±0.0019)和SRM IAEA-C7(一致值:Fm=0.4953±0.0012)样品的平均现代分数分别为1.3403±0.0058(n=73)和0.4964±0.0031(n=18)。因此,Zn/Fe密封管法的长期精度优于6‰,并在几年内取得了良好的精度。无机材料的平均背景14C年龄为43392±1489年BP(n=44),两种不含14C的有机材料的年龄分别为45285±2016年BP(n=15)和46388±2306年BP(n=36),表明在过去几年的整个化学制备过程和AMS测量中,碳污染水平保持在较低且稳定的水平。测量值和优先值之间的一致性使我们有信心使用火焰密封的Zn/Fe还原方法,用我们建立的真空管线制备正常质量尺寸的各种类型的天然样品。
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引用次数: 0
Correction Of Self-Absorption Effect In Laser-Induced Breakdown Spectroscopy Analysis For Sea Salt Aerosols Using A Duplicating Mirror 用复制镜校正海盐气溶胶激光诱导击穿光谱分析中的自吸收效应
IF 3.4 2区 化学 Q2 Chemistry Pub Date : 2022-09-28 DOI: 10.46770/as.2022.136
Lianbo Guo
: Sea salt aerosols significantly impact marine ecosystems and climate change; however, self-absorption effects unavoidably occur in the detection of sea salt aerosols via laser-induced breakdown spectroscopy (LIBS). This work illustrates the application of a renowned replica plasma method for self-absorption correction in the detection of sea salt aerosols via LIBS. Two sets of spectral data were obtained by adding a duplicating mirror behind the plasma, and the self-absorption correction factor was calculated using a previously described method. Consequently, the experimental results show a marked improvement in the linearity of the calibration curve. The determination coefficients of linear fitting were above 0.99, and the root mean square error of the cross-validation RMSECV was negligible. The duplicating mirror method for self-absorption correction in the detection of sea salt aerosols via LIBS can thus achieve high accuracy and stability within a certain range and therefore can prove useful for sea salt aerosol, aerosol, and gas detection.
:海盐气溶胶对海洋生态系统和气候变化产生重大影响;然而,在利用激光诱导击穿光谱(LIBS)检测海盐气溶胶时,不可避免地会出现自吸收效应。这项工作说明了一种著名的自吸收校正复制等离子体方法在通过LIBS检测海盐气溶胶中的应用。通过在等离子体后面添加复制镜获得两组光谱数据,并使用先前描述的方法计算自吸收校正因子。因此,实验结果表明,校准曲线的线性度显著提高。线性拟合的确定系数在0.99以上,交叉验证RMSECV的均方根误差可忽略不计。因此,在通过LIBS检测海盐气溶胶的过程中,用于自吸收校正的复制镜方法可以在一定范围内实现高精度和稳定性,因此可以用于海盐气溶胶、气溶胶和气体检测。
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引用次数: 0
Non-Destructive Identification And Quantification Of Ilmenite From A Single Particle Of The Chang’E-5 Lunar Soil Sample “嫦娥五号”月球土壤样品中钛铁矿的无损鉴定与定量
IF 3.4 2区 化学 Q2 Chemistry Pub Date : 2022-08-31 DOI: 10.46770/as.2022.029
Jinhua Li
: Ilmenite (FeTiO 3 ) is an early crystallization product of lunar magma and is the most abundant oxide mineral in lunar mare basalts. It is an important lunar resource that is mainly used for He and O 2 production, but also as a source of Fe. Therefore, the identification and quantification of ilmenite from lunar mare basalts is crucial to better understand lunar geological processes and develop lunar resources. Herein, a correlative micro-X-ray fluorescence (µXRF) and three-dimensional X-ray microscopy (3D XRM) approach was applied to non-destructively identify and quantify ilmenite from micro-sized single particles in China’s Chang’E-5 (CE-5) lunar soil samples. Ti-rich particles (P15 and P17) were selected from CE-5 lunar soil samples using scanning µXRF measurements. Scanning electron microscopy (SEM) indicated that both particles contained tiny ilmenite grains, but different major minerals. Ilmenite grains within these two particles were visualized and quantified using 3D XRM analyses. The ilmenite mass fractions estimated using the 3D XRM technique were similar to those obtained via µXRF quantification. Therefore, this study provides a novel nondestructive strategy for rapid ilmenite identification and quantification from single particles in CE-5 soil samples. This protocol can be replicated to characterize ilmenite and other minerals in precious extraterrestrial samples.
钛铁矿(FeTiO3)是月球岩浆的早期结晶产物,是月球玄武岩中含量最丰富的氧化物矿物。它是一种重要的月球资源,主要用于生产He和O2,也是Fe的来源。因此,对月球玄武岩中的钛铁矿进行识别和定量研究,对于更好地了解月球地质过程和开发月球资源至关重要。本文应用相关的微X射线荧光(µXRF)和三维X射线显微镜(3DXRM)方法对中国嫦娥五号月球土壤样品中微小单颗粒的钛铁矿进行了无损鉴定和定量。富钛颗粒(P15和P17)是使用扫描µXRF测量从CE-5月球土壤样本中选择的。扫描电子显微镜(SEM)表明,这两种颗粒都含有微小的钛铁矿颗粒,但主要矿物不同。使用3D XRM分析对这两个颗粒内的钛铁矿颗粒进行可视化和定量。使用3D XRM技术估计的钛铁矿质量分数与通过µXRF定量获得的钛铁矿的质量分数相似。因此,本研究为从CE-5土壤样品中的单个颗粒中快速识别和定量钛铁矿提供了一种新的无损检测策略。该方案可用于表征珍贵地外样品中的钛铁矿和其他矿物。
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引用次数: 2
In Situ SIMS Carbon Isotopic Analysis Of Carbon-Bearing Minerals In Nantan And Aletai Iron Meteorites: Implications On Genesis 南滩和阿勒泰铁陨石含碳矿物原位模拟碳同位素分析及其成因意义
IF 3.4 2区 化学 Q2 Chemistry Pub Date : 2022-08-31 DOI: 10.46770/as.2022.028
Ye Li
: A better understanding of the fractionation properties of carbon isotope between different carbon-bearing minerals will provide insights into the core-forming process of planets. In this study, we carried out an integrated study of petrography and in situ secondary ion mass spectroscopy (SIMS) carbon isotopic analysis for Nantan and Aletai iron meteorites. Haxonite in Aletai IIIE-an iron meteorite has a δ 13 C value of −14.80 ± 2.31‰, which is different from that of haxonite in Colonia Obrera IIIE iron meteorite. This suggests that the parent body of Aletai has a different initial carbon isotopic composition or experienced different planetary processes ( e.g. , degassing of CO 2 /CH 4 ). A graphite-rich nodule in Nantan IAB iron meteorite, characterized by a core-mantle-rim texture, was systematically studied. Some graphite grains in the nodule mantle (GNM; δ 13 C value as low as −14.65‰) and all graphite grains in the nodule rim (GNR; δ 13 C = −12.65 ± 2.90‰) are more depleted in 13 C than those in the nodule core (GNC; δ 13 C = −7.17 ± 2.42‰). This could be due to the preferential incorporation of 13 C into the early-crystallized GNC. The carbon isotopic fractionation (Δ 13 C = 6.9 ± 2.7 ‰) between coexisting GNR (δ 13 C = −12.65 ± 2.90‰) and cohenite (δ 13 C = −19.60 ± 2.59‰) yielded an equilibrium temperature of ~950–1310 °C, supporting the melt-crystallization genesis for nodule. We concur with previous studies that the early differentiation of Earth could have led to positive carbon isotopic fractionation between graphite/diamond in the mantle and metallic melt sinking to the core.
更好地了解不同含碳矿物之间碳同位素的分馏特性将有助于了解行星的核心形成过程。在本研究中,我们对南滩和阿勒泰铁陨石进行了岩石学和原位二次离子质谱(SIMS)碳同位素分析综合研究。阿勒泰IIIE-a铁陨石中褐长石的δ 13c值为- 14.80±2.31‰,与Colonia Obrera IIIE铁陨石中褐长石的δ 13c值不同。这表明阿勒泰的母体具有不同的初始碳同位素组成或经历了不同的行星过程(如CO 2 /CH 4的脱气)。对南滩IAB铁陨石中一个具有核-幔-环结构特征的富石墨结核进行了系统研究。结核地幔(GNM)中的石墨颗粒;δ 13c值低至- 14.65‰),结核边缘的石墨颗粒均为石墨(GNR;δ 13c = - 12.65±2.90‰)在13c中比在结核岩心(GNC;δ 13c =−7.17±2.42‰)。这可能是由于13c优先掺入早结晶的GNC。共生GNR (Δ 13 C = - 12.65±2.90‰)与纯铜矿(Δ 13 C = - 19.60±2.59‰)的碳同位素分馏(Δ 13 C = 6.9±2.7‰)得到的平衡温度为~950 ~ 1310℃,支持结核的熔融结晶成因。我们同意先前的研究,即地球早期分化可能导致地幔中石墨/金刚石和金属熔体下沉到地核之间的正碳同位素分馏。
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引用次数: 1
Microanalysis Techniques Guarantee Long-Term Research On Chang’e-5 Lunar Samples 微量分析技术保证了嫦娥五号月球样本的长期研究
IF 3.4 2区 化学 Q2 Chemistry Pub Date : 2022-08-31 DOI: 10.46770/as.2022.025
Wei Yang, Jinhua Li, Xiong-Yao Li, Yong He
Humans have successfully returned samples from the Moon ten times. Sample return missions have two advantages. First, we can carry out high-resolution and high-precision measurements of returned samples using state-of-the-art technologies in the laboratory. Second, the returned samples can support ongoing research for decades or centuries. The same sample can continuously “tell new stories” with the advancement of technology. On July 12, 2021, the allocation of the first batch of Chang'e-5 lunar samples quickly ignited a research bonanza for lunar and planetary sciences in China. State-of-the-art microanalysis techniques have played important roles in both scientific research and the artistic creation of lunar samples. For example, the combination of micro-X-ray fluorescence (μXRF), 3D X-ray microscopy (XRM), and scanning electron microscopy the rapid screening and positioning of Zr-bearing minerals for U-Pb dating. The high spatial resolution U-Pb dating method by secondary ion mass spectrometry it possible to determine the crystallization age of tiny (< tomography; 27 (4) trace element analyses by instrumental neutron activation analysis; 28 (5) high-resolution Cl isotope analyses by NanoSIMS 29 and high-precision C isotope analyses by SIMS; 30 (6) combined separation for high-precision iron, calcium, and magnesium isotope analyses; 31 (7) measurements of thermal-induced alterations by in situ TEM heating; 32 and (8) identification of lunar highland clasts in CE-5 breccias by TIMA-SEM-EPMA.
人类已经成功地从月球带回了10次样本。样本返回任务有两个优势。首先,我们可以在实验室使用最先进的技术对返回的样品进行高分辨率和高精度的测量。其次,返回的样本可以支持数十年或数百年的持续研究。随着技术的进步,同样的样品可以不断地“讲述新的故事”。2021年7月12日,第一批嫦娥五号月球样本的分配,迅速点燃了中国月球和行星科学研究的热潮。最先进的微量分析技术在月球样本的科学研究和艺术创作中都发挥了重要作用。例如,结合微x射线荧光(μXRF)、三维x射线显微镜(XRM)和扫描电镜对含锆矿物进行快速筛选和定位,进行U-Pb测年。高空间分辨率U-Pb定年方法采用二次离子质谱法,可以测定微量(<层析成像;27(4)仪器中子活化分析微量元素;28 (5) NanoSIMS 29高分辨率Cl同位素分析和SIMS高精度C同位素分析;30(6)用于高精度铁、钙和镁同位素分析的组合分离;(7)通过原位透射电镜加热测量热致变化;(8)利用TIMA-SEM-EPMA对CE-5角砾岩中月球高地碎屑的鉴定。
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引用次数: 1
First Location And Characterization Of Lunar Highland Clasts In Chang’E-5 Breccias Using TIMA-SEM-EPMA TIMA-SEM-EPMA首次定位和表征嫦娥五角砾岩中的月球高地碎屑
IF 3.4 2区 化学 Q2 Chemistry Pub Date : 2022-08-31 DOI: 10.46770/as.2022.030
Shui‐Jiong Wang
In this study, we identify for the first time four lunar highland clasts from the breccias (CE5C0800YJYX132GP) returned by the Chang’E 5 (CE-5) mission by combining Tescan Integrated Mineral Analysis (TIMA), Scanning Electron Microscopy (SEM), and Electron Probe Microanalysis (EPMA) techniques. The chemical compositions of plagioclases (An93.9–97.6) and mafic minerals (Fo71.4–87.9 for olivine and Mg65.1–84.6 for pyroxene) in these clasts are remarkably distinct from the more abundant mare basalts in the CE-5 landing site. They are in noritic anorthositic, troctolitic anorthositic, and troctolitic anorthositic compositions, which represent lunar highland crustal materials. Additionally, the three anorthositic clasts in the CE-5 samples are more magnesian than the Apollo ferroan anorthosites (FANs), but are similar to the magnesian anorthosites (MANs) commonly found in lunar highland meteorites. These newly found MANs in the CE-5 breccia are among the few reported in lunar returned samples, and may represent an important component of the lunar highland crust. Placing MANs in the rock lithologies of lunar feldspathic crust require a more complex crust-mantle process than that predicted by the classic Lunar Magma Ocean (LMO) hypothesis. Therefore, future research and characterization of Mg-suite and magnesian anorthositic rocks in CE-5 samples may help elucidate early lunar crustal evolution and crustmantle interaction.
在本研究中,我们结合Tescan综合矿物分析(TIMA)、扫描电子显微镜(SEM)和电子探针微分析(EPMA)技术,首次从嫦娥五号(CE-5)任务返回的角砾岩(CE5C0800YJYX132GP)中鉴定了四个月球高地碎屑。这些碎屑中斜长石(An93.9–97.6)和镁铁质矿物(橄榄石为Fo71.4–87.9,辉石为Mg65.1–84.6)的化学成分与CE-5着陆点中更丰富的母质玄武岩明显不同。它们具有代表月球高地地壳物质的北欧斜长岩、三方斜长岩和三方斜长岩成分。此外,CE-5样品中的三种斜长岩碎屑比阿波罗铁质斜长岩(FANs)更具镁质,但与月球高地陨石中常见的镁质斜长石(MANs)相似。这些在CE-5角砾岩中新发现的MANs是月球返回样本中为数不多的报告之一,可能代表了月球高地地壳的重要组成部分。在月球长石地壳的岩石岩性中放置MANs需要比经典的月球岩浆洋(LMO)假说预测的更复杂的壳幔过程。因此,未来对CE-5样品中镁套和镁质斜长岩的研究和表征可能有助于阐明早期月球地壳演化和壳幔相互作用。
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引用次数: 5
Determination Of The Multi-Elemental Composition Of Lunar Meteorites Using Instrumental Neutron Activation Analysis 用仪器中子活化分析法测定月球陨石的多元素组成
IF 3.4 2区 化学 Q2 Chemistry Pub Date : 2022-08-31 DOI: 10.46770/as.2022.026
Caijin Xiao
: The Moon is a key target for long-term human exploration beyond the Earth. In addition to precious lunar returned samples, lunar meteorites can provide important supplementary information on the composition and evolutionary history of the Moon. Herein, we report the elemental compositions of two lunar meteorites, Northwest Africa (NWA) 4734 and NWA 11111, analyzed using instrumental neutron activation analysis (INAA). Reference materials, including SRM2703 and GWB07105, were used for quality control. The INAA results for most elements in NWA 4734 and NWA 11111 are consistent with the previously reported data obtained by inductively coupled plasma-mass spectrometry analysis within analytical uncertainties. Since the INAA analysis is non-destructive, it can be widely applied to trace element measurements for extraterrestrial samples.
:月球是人类在地球以外进行长期探索的关键目标。除了珍贵的月球返回样本外,月球陨石还可以提供有关月球组成和演化历史的重要补充信息。在此,我们报道了两颗月球陨石,西北非洲(NWA)4734和NWA 11111的元素组成,并使用仪器中子活化分析(INAA)进行了分析。标准物质,包括SRM2703和GWB07105,用于质量控制。NWA 4734和NWA 11111中大多数元素的INAA结果与之前报道的在分析不确定性范围内通过电感耦合等离子体质谱分析获得的数据一致。由于INAA分析是非破坏性的,它可以广泛应用于地外样品的微量元素测量。
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引用次数: 0
ICP-MS-Based Methodology In Metallomics: Towards Single Particle Analysis, Single Cell Analysis, And Spatial Metallomics 基于ICP-MS的金属组学方法论:单颗粒分析、单细胞分析和空间金属组学
IF 3.4 2区 化学 Q2 Chemistry Pub Date : 2022-06-30 DOI: 10.46770/as.2022.108
Mingli Chen, Meng Wang
: As an emerging interdisciplinary science, metallomics aims to integrate research fields related to metals and metalloids in biological systems from a systematic perspective. Inductively coupled plasma mass spectrometry (ICP-MS) is considered one of the most versatile tools for metallomics research. This review presents a brief overview of ICP-MS and describes recent advances in ICP-MS instrumentation. Then, ICP-MS-based methods and applications are discussed, focusing on single particle analysis, single cell analysis, and spatial metallomics. With the rapid developments in instrumentation and methodology, ICP-MS-based methodologies will evolve further and play a dominant role in metallomics research.
作为一门新兴的交叉学科,金属组学旨在从系统的角度整合生物系统中金属及类金属的相关研究领域。电感耦合等离子体质谱(ICP-MS)被认为是金属组学研究中最通用的工具之一。这篇综述介绍了ICP-MS的简要概述,并描述了ICP-MS仪器的最新进展。然后,讨论了基于icp - ms的方法和应用,重点讨论了单颗粒分析、单细胞分析和空间金属组学。随着仪器和方法的快速发展,基于icp - ms的方法将进一步发展,并在金属学研究中发挥主导作用。
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引用次数: 9
Iron Isotopic Measurement Using Large-Geometry High-Resolution Multi-Collector Inductively Coupled Plasma Mass Spectrometer 用大几何高分辨率多收集器电感耦合等离子体质谱仪测量铁同位素
IF 3.4 2区 化学 Q2 Chemistry Pub Date : 2022-06-30 DOI: 10.46770/as.2022.111
Ming Li
: High-precision and accurate Fe isotopic analyses are essential for various geological processes. In this study, Fe isotopic measurements were optimized on a large-geometry, high-resolution Nu Plasma 1700 MC-ICP-MS instrument, which can distinguish Ar-related interferences completely as opposed to other general-sized MC-ICP-MS instruments. Under the conditions of high mass resolution, complete separation of Ar-related interference can be achieved. We evaluated the type and intensity of all Ar-related interferences. The effects of the acid molarity, concentration mismatch, residual HCl, and matrix elements were also evaluated. The results demonstrate that the molarity of the acid, residual HCl, and Cr significantly affected the precision of the Fe isotopic measurements. Fe was purified by one-step column anion-exchange separation using the anion resin AG-MP-1M. The long-term external precisions of δ 56 Fe and δ 57 Fe were greater than ± 0.03‰ (2SD) and ± 0.06‰ (2SD), respectively. The Fe isotopic compositions of the five geological reference materials measured in this study agreed with previously published data, within uncertainties.
:高精度和准确的铁同位素分析对各种地质过程至关重要。在这项研究中,Fe同位素测量是在一个大型几何结构、高分辨率Nu Plasma 1700 MC-ICP-MS仪器上进行优化的,与其他通用尺寸的MC-ICP-M仪器相比,该仪器可以完全区分与Ar相关的干扰。在高质量分辨率的条件下,可以实现Ar相关干扰的完全分离。我们评估了所有Ar相关干扰的类型和强度。还评估了酸摩尔浓度、浓度失配、残留HCl和基质元素的影响。结果表明,酸、残留HCl和Cr的摩尔浓度显著影响Fe同位素测量的精度。采用阴离子树脂AG-MP-1M,采用一步柱阴离子交换法对铁进行纯化。δ56Fe和δ57Fe的长期外精度分别大于±0.03‰(2SD)和±0.06‰(2SD)。本研究中测量的五种地质参考物质的Fe同位素组成与之前公布的数据一致,但存在不确定性。
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引用次数: 2
期刊
Atomic Spectroscopy
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