ANALYTICAL CHEMISTRY
·
2021
·
IF 6.986
Xiuhong Liao,Zhaochu Hu,Wen Zhang,Yantong Feng,Tao Luo,Zaicong Wang,Ming Li,Keqing Zong,Yongsheng Liu,Shenghong Hu
Using boron as a test analyte, laser ablation (LA) solution sampling multicollector inductively coupled plasma mass spectrometry (MC-ICP-MS) is proposed and validated as a fast method for isotopic analysis in natural liquids and digested samples without any prior purification process. We demonstrated that the solution reference standard can be used as a bracketing standard for in situ δ11B analysis in solids. Based on a sensitivity enhancement of 8- to 9-fold, all testing solutions were diluted in a 5% (v/v) NH3·H2O instead of classical 2% (v/v) HNO3. With a discrete and minimal sample solvent loading by the LA sampling strategy, it produces nearly “dry” plasma conditions that tolerate the sample matrix remarkably. The memory effect, one of the most difficult challenges in boron analysis, was dramatically eliminated with only 15 s wash time; thus, each analysis took less than 100 s. No significant matrix effects were observed for varying 50–100% boron concentrations in the samples and varying 20–60% NH3·H2O matrix used for the dilution, as well as for samples doped with a 1/100 synthetic seawater matrix. The external precision of δ11B measurements in NIST 951a was ± 0.30‰ (2SD). Good agreement with the values described in literature studies was achieved for δ11B measurements in eight geological reference materials, with precisions between 0.4 and 0.7‰ (2SD), confirming the accuracy of the proposed method. The proposed method offers advantages of simple sample preparation, fast analysis, and little use of chemical reagents.
研究领域:
地球化学
·
分析化学
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DOI
高影响因子
JOURNAL OF ANALYTICAL ATOMIC SPECTROMETRY
·
2024
·
IF 3.1
Qinyuan Qu,Wengang Liu,Wang Zheng,Benjamin Chetelat,Qingchuan Liu,Jiubin Chen
The geological and environmental applications of tin (Sn) isotopes have been hindered by the shortcomings of chemical purification, as severe loss of Sn would occur during sample preparation (evaporation and re-dissolution) and column separation, triggering isotope measurement bias. In this study, we develop a novel and robust separation method to purify Sn from natural samples for accurate isotope measurements. The protocol is established by combining two chromatographic columns loaded with AG 1-X8 and AG 50W-X12 resins, and optimizing the sample evaporation and re-dissolution procedures. The method is proven to efficiently eliminate the main interferents such as Ag, Zn, Mo, Cd and Sb and results in low procedural blank (0.54 ± 0.21 ng, n = 3), quantitative recovery (95–102%, n = 32) and good external precision (δ120Sn of 0.02–0.04‰, in 55 measurements) for isotope measurement. The protocol is further applied to seven geological and environmental reference materials (BCR-2, BHVO-2, AGV-2, JG-2, AC-E, PACs-2 and GSS 7) and new values are reported for both odd (δ119Sn and δ117Sn) and even (δ120Sn and δ122Sn) Sn isotope ratios. This study demonstrates clearly the potential application of our method for studying the geochemical behaviors of Sn and its isotopes in various aspects.
研究领域:
地球化学
·
分析化学
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产品关联
DOI
高影响因子
ANALYTICAL CHEMISTRY
·
2021
·
IF 6.986
Lin-Hui Dong,Wei Wei,Cheng-Long Yu,Zhen-Hui Hou,Zhen Zeng,Tianyu Chen,Fang Huang
Vanadium isotope compositions (δ(51V)) in marine carbonates are a potential proxy to trace global redox states of ancient oceans. Although high-precision δ(51V) analyses are available for many geological materials, carbonate-hosted δ(51V) data have not been reported yet due to extremely high matrix elements and low V contents (generally below 10 μg g–1). In this study, we developed an Fe coprecipitation method combined with an Fe column to preconcentrate V from the major matrix elements and subsequent four-step chromatographic procedures to further purify V in carbonates. The δ(51V) values were measured using a sample–standard bracketing method by MC-ICP-MS. The robustness of this method was assessed by analyzing element-doped and matrix-spiked synthetic carbonate solutions containing an in-house δ(51V) standard, USTC-V. The mean δ(51V) value of the synthetic carbonate solutions (0.06 ± 0.08‰; 2SD, n = 33) is in good agreement with the recommended value of the USTC-V relative to the Oxford AA solution (0.07 ± 0.08‰; 2SD, n = 347). In addition, the consistency in the δ(51V) value of the igneous carbonatite standard, COQ-1, which was processed in parallel with the whole purification (−0.48 ± 0.04‰; 2SD, n = 3) and a four-step chromatographic procedure (−0.43 ± 0.08‰; 2SD, n = 3), further validates the robustness of our method. For the first time, we obtained δ(51V) values of four carbonate reference materials: JDo-1, −0.56 ± 0.09‰ (2SD, n = 27); JLs-1, −0.61 ± 0.14‰ (2SD, n = 33); GBW07217a, −0.79 ± 0.09‰ (2SD, n = 6); GBW07214a, −0.51 ± 0.13‰ (2SD, n = 48). The long-term external precision of carbonate-hosted δ(51V) analyses is better than ±0.14‰ (2SD). Our method can be applied to measure carbonate-hosted δ(51V) to trace the evolution in global marine redox states throughout the Earth’s history.
研究领域:
地球化学
·
海洋科学
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DOI
PubMed
高影响因子
JOURNAL OF ANALYTICAL ATOMIC SPECTROMETRY
·
2024
·Vol. 39
·期 7
·1938-1947
·
IF 3.1
Lingke Li,Fei Wu,Yongsheng Liu,Tao He,Jie Lin,Wen Zhang,Rui Li,Haihong Chen,Keqing Zong,Zhen Zeng,Zhaochu Hu
Stable nickel (Ni) isotopes have shown great potential for investigating planetary accretion processes, mantle–crust magmatism, and paleo-marine evolution. The development of an economical and time-efficient separation method for Ni isotope analysis holds significant value within the realm of Ni isotope research. Previous purification methods for Ni isotope analysis have typically relied on either multi-column procedures or the utilization of significant quantities of organic reagents, such as acetic acid, acetone, and dimethylglyoxime. In this study, a novel two-column chromatographic separation procedure was presented for the determination of Ni isotope compositions in geological materials. A cation resin (AG50W-X8) was utilized in conjunction with diluted HCl and HF to effectively remove a substantial portion of matrix elements. Subsequently, trace amounts (100–200 μL) of Ni-spec resin were used for further purification of Ni. This relatively simple purification scheme for Ni isotope analysis effectively reduces the use of organic reagents and the amount of Ni-spec resin compared to previous methods that relied on multi-column separation and organic reagent extraction. Ni isotopic compositions were analyzed using multi-collector inductively coupled plasma mass spectrometry (MC-ICP-MS). The instrumental mass discrimination of Ni isotopic ratios was corrected for using the double spike (DS) combined with the sample–standard bracketing (SSB) method. The Ni isotope compositions (δ60Ni) of in-house standards (SCP and CUG) were −0.06 ± 0.05‰ (2 SD, n = 104) and 0.36 ± 0.06‰ (2 SD, n = 97), respectively. Furthermore, the measured δ60Ni values of various geological reference materials (BCR-2, BHVO-2, BIR-1, DTS-1, DTS-2b, SDO-1, GSP-2, and W-2a from the USGS; JB-1b from the GSJ; GSR-2, GSR-3, GSR-4, GSR-5, and GSR-10 from the NRCGA) were consistent with previous studies within measurement error. Additionally, the δ60Ni values of AGV-1 from the USGS, as well as those of GSR-10, GSR-12, GSR-15, GSR-17, GSR-18, and GSR-19 from the NRCGA are reported here for the first time. Based on repeated measurements of pure solutions and reference materials, the long-term reproducibility of δ60Ni values was better than ± 0.06‰ (2 SD). Consequently, our study presents a relatively straightforward purification method for Ni for its isotopic analysis using only trace amounts of organic reagents and Ni-spec resin.
研究领域:
地球化学
·
同位素地球化学
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产品关联
DOI
高影响因子
GEOSTANDARDS AND GEOANALYTICAL RESEARCH
·
2013
·Vol. 38
·期 3
·345-354
·
IF 2.77
Jie Li,Xi-Rong Liang,Li-Feng Zhong,Xuan-Ce Wang,Zhong-Yuan Ren,Sheng-Ling Sun,Zhao-Feng Zhang,Ji-Feng Xu
en This link goes to a English section fr This link goes to a French section A novel preconcentration method is presented for the determination of Mo isotope ratios by multi-collector inductively coupled plasma-mass spectrometry (MC-ICP-MS) in geological samples. The method is based on the separation of Mo by extraction chromatography using N-benzoyl-N-phenylhydroxylamine (BPHA) supported on a microporous acrylic ester polymeric resin (Amberlite CG-71). By optimising the procedure, Mo could be simply and effectively separated from virtually all matrix elements with a single pass through a small volume of BPHA resin (0.5 ml). This technique for separation and enrichment of Mo is characterised by high selectivity, column efficiency and recovery (~ 100%), and low total procedural blank (~ 0.18 ng). A 100 Mo- 97 Mo double spike was mixed with samples before digestion and column separation, which enabled natural mass-dependent isotopic fractionation to be determined with a measurement reproducibility of < 0.09‰ (δ 98/95 Mo, 2 s ) by MC-ICP-MS. The mean δ 98/95 Mo SRM 3134 (NIST SRM 3134 Mo reference material; Lot No. 891307) composition of the IAPSO seawater reference material measured in this study was 2.00 ± 0.03‰ (2 s , n = 3), which is consistent with previously published values. The described procedure facilitated efficient and rapid Mo isotopic determination in various types of geological samples. en This link goes to a English section fr This link goes to a French section Une nouvelle méthode de pré-concentration est présentée pour la détermination des rapports isotopiques du Mo par spectrométrie de masse à source plasma et multi-collection (MC -ICP-MS) dans des échantillons géologiques. La méthode est basée sur la séparation du Mo par Chromatographie d'extraction en utilisant du N-benzoyle-N- phénylhydroxylamine (BPHA) supporté par une résine polymère d'ester acrylique microporeuse (Amberlite CG- 71). En optimisant la procédure, le Mo peut être simplement et efficacement séparé de la quasi-totalité des éléments de la matrice avec un seul passage à travers un petit volume de résine BPHA (0,5 ml). Cette technique de séparation et d'enrichissement du Mo est caractérisée par une grande sélectivité, une grande efficacité et une grande récupération de la colonne (~ 100%), et un faible total de la procédure de blanc (~ 0,18 ng). Un double spike Mo 100 -Mo 97 a été mélangé avec les échantillons avant la digestion et la séparation sur colonne, ce qui a permis la détermination du fractionnement isotopique naturel dépendant de la masse avec une reproductibilité de mesure de < 0,09 ‰ ( δ98/95 Mo, 2s) par MC -ICP-MS. La composition moyenne δ 98/95 Mo SRM 3134 (matériau de référence NIST SRM 3134 Mo; Lot n ° 891307) de l'eau de mer de référence IAPSO mesurée dans cette étude est de 2,00 ± 0,03 ‰ (2s, n = 3), ce qui est cohérent avec les valeurs précédemment publiées. La procédure décrite facilite une détermination efficace et rapide des rapports isotopiques du Mo dans divers types d’échantillons géologiques.
研究领域:
地球化学
·
分析化学
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产品关联
DOI
高影响因子
JOURNAL OF ANALYTICAL ATOMIC SPECTROMETRY
·
2024
·Vol. 39
·期 5
·1353-1360
·
IF 3.1
Ning Zhang,Xue-Qin Wen,Mao-Yong He,Tongxiang Ren,Li Deng,Yuanyuan Cheng,Xiaolin Zhang,Junhua Guo
Boron, as both a lithophilic and biophilic element with high solubility, provides profound insights into the history of the Earth and environmental changes through its isotopes present in sediments. However, there are still some challenges in the accurate and precise determination of boron isotopes in sediments, particularly in pre-processing. When using boron-specific resins for the purification and enrichment of boron, it is in an alkaline environment. During the pre-treatment process, insoluble hydroxides of Al, Fe, and rare earth elements precipitate, exhibiting strong boron adsorption in high-pH solutions. This has potential impacts on the accuracy of boron isotope measurements. This study assesses a method that uses Na2CO3 and K2CO3 for dissolution at reduced temperatures and a cationic resin combined with a boron-specific resin for the enrichment and purification of boron in sediments. All the Al, Fe, and rare earth elements, which can generate water-insoluble hydroxides, were mainly removed by the cationic resin column, and boron in the sample solutions without Al, Fe, and rare earth elements was extracted by the boron-specific resin. The boron isotope composition (δ11B) was determined using MC-ICP-MS. The results indicate that this method fully decomposes and efficiently purifies the sediments. The long-term instrumental external reproducibility of δ11B values for NIST SRM 951a, ERM-AE120, and ERM-AE121 were 0.01 ± 0.09‰ (n = 13), −20.28 ± 0.16‰ and 19.98 ± 0.14‰, based on the measurements using a series of international reference materials over the last three years. The measured δ11B values for the standards have various matrices. The δ11B values of GSR-1 (−13.14‰ ± 0.27‰), BHVO-2 (−0.66 ± 0.06‰), AGV-2 (−3.22 ± 0.14‰) and Nass-6 (39.83 ± 0.07‰) are in agreement with the published data within uncertainty. The samples from Sihailongwan Maar Lake (SMK), the Loess Plateau (Loess-1 and Loess-2), shale (SH-1 and SH-2), and basalt (BL-1 and BL-2) were treated. The δ11B values for SMK, Loess-1, and Loess-2 are −10.20 ± 0.29‰, −11.06 ± 0.16‰, and −10.79 ± 0.10‰, showing a close relationship with δ11B of the continental crust. The δ11B values for shale (SH-1 and SH-2) are −7.06‰ ± 0.32‰ and +2.28‰ ± 0.05‰, while those for basalt (BL-1 and BL-2) are −8.78‰ ± 0.09‰ and +2.50‰ ± 0.19‰. These results indicate a significant variation in the δ11B values across these samples. These findings imply that this approach is capable of efficiently enriching and purifying boron in sediments. It enables accurate and precise determination of δ11B in sediments, thus offering a reliable tool for conducting boron isotope studies in sedimentary earth science.
研究领域:
地球化学
·
环境科学
·
分析化学
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DOI
高影响因子
JOURNAL OF ANALYTICAL ATOMIC SPECTROMETRY
·
2022
·Vol. 38
·期 1
·142-155
·
IF 4.351
Jia-Xin She,Weiqiang Li,Shichao An,Yuanfeng Cai
Stable Sn isotopes have the potential to constrain the behavior of Sn in various natural and anthropogenetic processes, however, studies on stable isotopes of Sn for terrestrial rock samples have been limited. Here, we present a high-precision Sn isotope analytical method of geological samples by the double spike technique. Samples were equilibrated with a 117Sn–122Sn double spike during dissolution, then Sn was purified from the rock matrix using TRU spec resin. The purified Sn solutions were analyzed on a Nu 1700 Sapphire MC-ICP-MS, and data reduction was performed using Newton–Raphson iteration. Effects of acid mismatch, concentration mismatch, and matrix elements were systematically tested to evaluate their impact on the accuracy and repeatability of the measurements. We show that the mismatch of acidity exerts negligible influences on the Sn isotope analysis. By contrast, the accuracy of Sn isotopic measurements could be compromised if the Sn concentration of the sample is below 40% of that of the standard. To ensure the accuracy of Sn isotope analysis, the concentration match between the sample and standard should be better than ±20%. When the measured solution has varying mass ratios of [X]/Sn (ng g−1/ng g−1) lower than 0.5 for Mg, Ca, Fe, Ti, U, Ni, Ag, As, Ru, and Mo, the measured Sn isotope composition was not affected. However, Cd in Sn samples could affect the accuracy of Sn isotope analysis by the 117Sn–122Sn double spike through the generation of 116CdH+ in plasma that interferes with 117Sn+. The Cd/Sn ratio needs to be below 0.01 to ensure analytical accuracy by the double spike method. The accuracy of this method was further verified by measuring the pure solution with both double spike and sample standard bracketing methods, as well as processing a synthetic solution through column chemistry. The Sn isotope compositions of geological samples measured using our method are reproducible and consistent with previous data from other laboratories. Additionally, Sn isotope data for geological reference materials BIR-1, RGM-1, and GSR-1 are reported for the first time. Based on repeated analyses of pure and geological reference materials, the long-term intermediate precision is better than ±0.069‰ on δ122/118Sn for a spiked solution of 100 μg g−1.
研究领域:
地球化学
·
分析化学
·
地质学
✓ 已验证
DOI
高影响因子
GEOSTANDARDS AND GEOANALYTICAL RESEARCH
·
2025
·
IF 3.4
Ai-qun Xiao,Pei-pei Zhao,Lu Yin,Bei Xu
A single-column extraction chromatographic purification method for tungsten using the N-benzoyl-N-phenylhydroxylamine (BPHA) resin was investigated in this study. This method greatly simplifies the W purification procedure, and only 10 ml of acid (5 ml 3 mol l -1 HCl-0.1 mol l -1 HF and 5 ml 1 mol l -1 HF) is required to separate W from Ti, Zr, Hf, Ta and other matrix elements. The blank in the separation step was less than 0.1 ng, and the recovery of W was ~ 99%. Six independent digestion measurements of reference materials BHVO-2, BCR-2, RGM-2 and JB-2 yielded μ 182 W values (mean value with intermediate precision, 95% confidence level) of -10.3 ± 4.0 ( n = 6, 2 s )，-1.2 ± 5.3 ( n = 6, 2 s )，-1.4 ± 4.4 ( n = 6, 2 s ) and 0.6 ± 3.8 ( n = 6, 2 s ), respectively, which are in good agreement with the previously reported values.
研究领域:
地球化学
·
分析化学
·
同位素地质学
·
质谱分析
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产品关联
DOI
高影响因子
CHEMICAL GEOLOGY
·
2020
·
IF 3.363
Jing-Jing Fan,Jie Li,Qiang Wang,Le Zhang,Jing Zhang,Xiang-Lan Zeng,Lin Ma,Zi-Long Wang
Recent advances in analytical techniques have achieved high-precision (2σ ≤ 0.06‰) determinations of Mo isotopic ratios in silicate rocks but few such data are as yet available, especially for low-Mo (<50 ppb) rocks such as leucogranites . Here we present two low-blank, double-spike, high-yield, ion-exchange chromatographic methods (single- and two-column) for precise determination of Mo isotopic ratios in low-Mo rock samples (10–500 ppb) using multicollector–inductively coupled plasma–mass spectrometry (MC–ICP–MS). The two-column technique involved AG 1-X8 anion-exchange (100–200 mesh) and BPHA chelatin resins, with the latter also used in the single-column procedure. Two USGS reference materials (basalt BIR-1a and diabase W-2a) were analyzed for quality-control purposes. Their δ 98/95 Mo values determined using the two methods are consistent within uncertainties, and with those determined by previously published methods. We provide the first Mo isotopic data for the reference materials of dunite DTS-2b (USGS), GPt-3 (NRCG) and peridotite WPR-1 (CCRMP). δ 98/95 Mo values for DTS-2b and WPR-1 by using two-column procedure are in good agreement with those obtained by single-column separation. Repeated analyses of these standards indicate a long-term external reproducibility of better than ±0.05‰. However, the δ 98/95 Mo values of GPt-3 show poor reproducibility due to either the sample heterogeneity or existing undigested minerals (e.g., spinel). The methods were applied to leucogranites with low Mo contents of 10–74 ppb from the Himalaya orogen and southern Lhasa terrane of Tibet . The isotopic analyses yielded δ 98/95 Mo values of −0.2‰ to 0.34‰ and −0.41‰ to −0.68‰ (against NIST SRM 3134), respectively, within the range of values for igneous crust. Their contrasting Mo isotopic compositions may indicate compositional diversity in their sources or differences in magma evolution .
研究领域:
地质学
·
地球化学
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产品关联
DOI
高影响因子
JOURNAL OF ANALYTICAL ATOMIC SPECTROMETRY
·
2026
·
IF 3.3
Bingyu Peng,Qiaohui Zhong,Gaobin Chu,Jie Li
Conventional indium (In) separation methods based on anion-exchange resins typically involve multiple evaporation and medium-transfer steps or require large volumes of concentrated acids, leading to prolonged processing times and potential contamination risks. Herein, we present an efficient two-stage column separation method for the separation and purification of In from complex geological matrices using two self-made trioctylamine (N235) and tri-n-octylphosphine oxide (TOPO) resins, enabling high-precision In isotopic analysis by multi-collector inductively coupled plasma mass spectrometry (MC-ICP-MS). In the first column, most matrix elements were efficiently removed in HBr medium, and the In fraction together with trace amounts of Mo and Sn were eluted using 0.2 M HCl, and were ready for a second column purification without any evaporation. Subsequently, the residual interference of Mo and Sn was quantitatively removed from the In fraction using the TOPO resin column. This method not only eliminates hazardous reagents such as hydrofluoric acid (HF) but also significantly reduces resin and acid consumption compared to previous methods, achieving high In recoveries (>95%) and low procedural blanks (<0.2 ng). For In isotopic analysis, a combination of standard-sample bracketing with an Sb external method was employed for instrumental mass bias correction. NIST SRM 3124a In standard solution, for the first time, was adopted as a reference with an external reproducibility of 0.07‰ (2SD, n = 233) over a year. The method was validated using nine diverse geological reference materials (RMs). The In isotopic compositions obtained for three internationally recognized RMs were in good agreement with previously reported literature values. For the six other RMs, In isotope data are reported here for the first time, and they exhibit excellent external reproducibility. Moreover, all purified samples showed negligible isobaric interferences and matrix effects during MC-ICP-MS analysis, confirming the method's suitability for challenging geological samples.
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DOI
高影响因子
ANALYTICA CHIMICA ACTA
·
2026
·
IF 6.1
Xin Li,Qiao-Hui Zhong,Jia-Kai Guo,Mei-Ju Li,Gao-Bin Chu,Jie Li
N235 extraction resin enables efficient Pb separation from geological reference materials. • Matrix are removed with dilute HBr and water, followed by Pb separation using low-concentration HBr. • The purified Pb is ready for MC-ICP-MS analysis without any evaporation step. • The method reliability is validated using various reference materials. • Pb isotope ratios of JA-1a are reported for the first time. Lead isotopic variations provide crucial insights into geochemical reservoirs, environmental sources, and geological ages. To obtain precise Pb isotope data by MC-ICP-MS, we develop a simple and efficient separation procedure using trialkyl amine (N235) resin. Batch experiments show that N235 strongly adsorbs Pb in 0.4 mol L −1 HBr, weakly in HCl, and not at all in HNO 3 media. Specifically, the optimized column procedure achieved high Pb recovery (94.5%) and eluted Pb in 0.5 mol L −1 HNO 3 , allowing direct measurement without evaporation, thereby reducing procedural blanks. The method was validated with ten reference materials (GSR-1, GSR-2, GSR-3, GSR-7, GSP-2, BHVO-2, JA-2, JG-2, JB-2, and JA-1a). Measured 206 Pb/ 204 Pb, 207 Pb/ 204 Pb and 208 Pb/ 204 Pb ratios agreed with published values within uncertainty, with external reproducibility better than 0.05% (RSD). Owing to its simplicity, high recovery, low blank, and low cost, this method offers a practical pretreatment strategy for high-precision Pb isotope analysis in diverse geological samples. A very simple, low-blank, and effective Pb purification method with a self-made trialkyl amine extraction resin is developed to separate Pb from geological reference materials for high precision determination of Pb isotopic compositions by MC-ICP-MS. Download: Download high-res image (254KB) Download: Download full-size image
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DOI
高影响因子
GEOSTANDARDS AND GEOANALYTICAL RESEARCH
·
2024
·
IF 2.7
Xiuhong Liao,Tao Chen,Tao Luo,Yue Cai,Wen Zhang,Zuowei Yin,Zhaochu Hu
Tourmaline serves as a vital recorder of geological processes. However, suitable tourmaline reference materials (RMs) for elemental and stable isotopic composition in situ measurements are still limited. In this study, three tourmaline megacrysts (MD-B66, IM-B232 and BR-DG68) were characterised as potential RMs for B isotope measurements by LA-MC-ICP-MS and mass fraction determinations by LA-ICP-MS. Over 251 measurements with LA-MC-ICP-MS on ten randomly selected fragments from MD-B66 consistently yielded B isotope ratios of -7.74 ± 0.25‰ (2 s ), establishing MD-B66 as a suitably homogeneous primary reference material for high-precision, in situ microbeam B isotope measurements. Notably, the (long-term) intermediate precision of 0.25‰ (2 s ) for in situ B isotope measurements obtained using this reference material is comparable to that reported from solution MC-ICP-MS methods in the literature. Two other tourmaline megacrysts, with intermediate precision ranging from ± 0.48‰ to ± 0.61‰ (2 s ) for δ 11 B measurement, can be employed as secondary RMs for quality control. The mean δ 11 B values determined by solution MC-ICP-MS for MD-B66 (-7.71 ± 0.32‰, n = 12), IM-B232 (-13.17 ± 0.62‰, n = 8) and BR-DG68 (-13.85 ± 0.32‰, n = 12), with expanded uncertainties at the 95% confidence level, are consistent with those determined by LA-MC-ICP-MS. Among these three new RMs, BR-DG68 displays relatively homogeneous major and trace element mass fractions. Characterisation using both in situ and wet chemical techniques demonstrated the suitability of BR-DG68 as the first tourmaline reference material for elemental measurement by LA-ICP-MS, which would permit matrix-matched and therefore more accurate elemental measurement in tourmalines. Unlike electron probe microanalysis with B and Li contents calculated based on stoichiometric assumptions, direct and accurate measurements of the two low atomic number elements, along with other major and trace elements can be achieved by LA-ICP-MS with the aid of the newly developed tourmaline reference material BR-DG68. Overall, current and future studies in geochemistry may benefit from these newly proposed tourmaline RMs, which should lead to significantly improved precision and accuracy for in situ B isotope and elemental measurement.
研究领域:
地质学
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地球化学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）