Journal of Analytical Atomic Spectrometry最新文献

{"title":"Measurement of uranium and fission products in a spent fuel sample using fiber-optic laser-induced breakdown spectroscopy","authors":"Munkhbat Batsaikhan, Hironori Ohba, Takahiro Karino, Katsuaki Akaoka, Ikuo Wakaida, Yoshihiro Iwata and Kan Sakamoto","doi":"10.1039/D5JA00451A","DOIUrl":"https://doi.org/10.1039/D5JA00451A","url":null,"abstract":"<p >This study presents the development and application of a fiber-optic laser-induced breakdown spectroscopy (FO-LIBS) system designed for remote, <em>in situ</em> analysis of nuclear fuel debris at the Fukushima Daiichi Nuclear Power Station (FDNPS). To evaluate its performance in uranium detection and spatial mapping, a two-stage experimental approach was used. In the first stage, the FO-LIBS detection limit for uranium was determined in a laboratory environment using UO<small>₂</small> samples with different concentrations. Based on prominent uranium emission lines and calibration restricted to a low-concentration linear region (&lt;10 wt%), a detection limit of approximately 3.5–3.7 wt% was achieved, with regression coefficient <em>R</em><small>²</small> = 0.95. The system's ability for two-dimensional elemental mapping was then demonstrated on a simulated debris sample (UO<small>₂</small>–Zr–SUS), and the LIBS spatial maps were validated against scanning electron microscopy-energy dispersive X-ray spectroscopy measurements. In the second stage, the FO-LIBS system was deployed for the first time in a hot cell under high radiation (230 mSv h<small>⁻¹</small>) to analyse an actual boiling water reactor's spent fuel sample, as an exemplar of FDNPS fuel debris. The system successfully identified the main fuel components (U and Zr) along with several long-lived fission products and related markers (analytical proxies) such as Sr, Cs, Mo, Ba, and Rb. The LIBS emission intensity of Ba, Rb, and Cs near the periphery region was slightly higher than at the center of the fuel. This indicates a higher concentration of these elements in that area.</p>","PeriodicalId":81,"journal":{"name":"Journal of Analytical Atomic Spectrometry","volume":" 4","pages":" 1324-1335"},"PeriodicalIF":3.1,"publicationDate":"2026-02-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147686499","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Investigating the influence of spatial confinement on self-absorption effects in laser-induced breakdown spectroscopy","authors":"WeiJie Zhan, Ping Liao, Yun Tang, Zhiyuan Dou and Jie Zhan","doi":"10.1039/D5JA00453E","DOIUrl":"https://doi.org/10.1039/D5JA00453E","url":null,"abstract":"<p >This study investigates a spatial confinement approach utilizing cylindrical cavities to mitigate plasma self-absorption effects in laser-induced breakdown spectroscopy (LIBS)—a critical limitation for quantitative analysis. Experiments systematically evaluate atomic lines (Al <small>I</small> 396.15 nm, Cu <small>I</small> 521.83 nm, and Mg <small>I</small> 517.27 nm) and an ionic line (Mg <small>II</small> 293.65 nm) of the 6061 Al alloy, T2 Cu, and AZ31B Mg alloy. Results demonstrate that confinement reduces self-absorption through three mechanisms: restricting plasma expansion, elevating the electron temperature, and reducing the ground-state particle density. Optimal reduction occurs at a cavity height of <em>h</em> = 12 mm and a radius of <em>r</em> = 8 mm. Specifically, ionic lines (<em>e.g.</em>, Mg <small>II</small> 293.65 nm, ionization energy = 8.65 eV) exhibit significantly stronger reduction than atomic lines under identical conditions, which is attributed to their higher ionization energies and narrower spectral widths. This differential response originates from the reduced ground-state particle density and complex transition pathways in ionic species. The technique effectively minimizes spectral line attenuation and broadening, thereby providing physical insights into the confinement-mediated mitigation of self-absorption and offering a potential strategy for improving quantitative LIBS analysis.</p>","PeriodicalId":81,"journal":{"name":"Journal of Analytical Atomic Spectrometry","volume":" 3","pages":" 1091-1098"},"PeriodicalIF":3.1,"publicationDate":"2026-02-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147388523","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Establishing XANES signatures of rhenium oxidation states: a combined theoretical and experimental reference study for analytical applications","authors":"Anna D. Krot, Daniil A. Novichkov, Mikhail A. Volkov, Anastasiia V. Sitanskaya, Artem A. Mitrofanov, Stepan N. Kalmykov and Petr I. Matveev","doi":"10.1039/D5JA00410A","DOIUrl":"https://doi.org/10.1039/D5JA00410A","url":null,"abstract":"<p >X-ray absorption near edge structure (XANES) spectroscopy provides unique insights into the oxidation state and local coordination environment of transition metals, yet systematic reference datasets remain scarce. Here, we report a comprehensive experimental and theoretical study of Re L<small>₃</small> and L<small>₁</small> edge XANES spectra across oxidation states 0 to +7 (excluding +2), including oxides, halides, carbonyls, and polyoxometalates. The results demonstrate that the L<small>₃</small> edge white line position is strongly affected not only by the formal oxidation state but also by ligand donor–acceptor properties, while the L<small>₁</small> edge exhibits reduced ligand sensitivity with informative pre-edge features for Re(<small>VII</small>) species. Analysis of aqueous solutions reveals that polyoxorhenates persist in dilute aqueous solutions, underscoring the utility of XANES for solution speciation studies. Correlation of edge energies with coordination charge yields a more robust descriptor than formal oxidation state, enabling improved interpretation of spectral shifts. Density of states calculations further clarify the role of 5d-ligand orbital hybridization in shaping edge and post-edge features. Based on a substantial reference library of rhenium XANES data, this study establishes a new approach to interpreting L-edge XANES shifts, emphasizing the role of the ligand field, and provides generalizable strategies that can be applied to other polyvalent transition metals.</p>","PeriodicalId":81,"journal":{"name":"Journal of Analytical Atomic Spectrometry","volume":" 4","pages":" 1277-1289"},"PeriodicalIF":3.1,"publicationDate":"2026-02-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147686472","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Quantification of spacecraft heatshield contaminants seen in reentry shock layer emissions using calibration-free LIBS","authors":"Keira J. Leistikow, Noshin Nawar, Justin I. Borrero-Negrón, Marat Kulakhmetov, Paolo Valentini and Ashwin P. Rao","doi":"10.1039/D5JA00374A","DOIUrl":"https://doi.org/10.1039/D5JA00374A","url":null,"abstract":"<p >Shock layer thermochemistry during atmospheric reentry of spacecraft is strongly influenced by the composition of thermal protection system (TPS) materials. In this study, we implement calibration-free laser-induced breakdown spectroscopy (CF-LIBS) to profile cross-sections of phenolic impregnated carbon ablator (PICA) and room temperature vulcanizing (RTV) silicone from the heatshield of a commercial reentry capsule. CF-LIBS measurements determine that these materials contain alkali and alkaline earth contaminants (<em>e.g.</em>, Na, Ca) at levels up to 10 parts-per-million (ppm) and heavier metals like Fe at 10<small>³</small> ppm. Contaminant concentrations are linked to observed strong atomic radiators identified from <em>in situ</em> shock layer emissions taken during reentry, demonstrating the value of CF-LIBS for interpreting complex shock-layer emission data from reentry spacecraft.</p>","PeriodicalId":81,"journal":{"name":"Journal of Analytical Atomic Spectrometry","volume":" 3","pages":" 1048-1059"},"PeriodicalIF":3.1,"publicationDate":"2026-02-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://pubs.rsc.org/en/content/articlepdf/2026/ja/d5ja00374a?page=search","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147388519","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Thiol-functionalized magnetic biochar as an efficient sorbent for magnetic dispersive micro-SPE coupled with ICP-MS determination of Pb(ii), Cd(ii), and Hg(ii) in environmental waters","authors":"Thi Hoa Vu and Van Cuong Nguyen","doi":"10.1039/D5JA00439J","DOIUrl":"https://doi.org/10.1039/D5JA00439J","url":null,"abstract":"<p >A thiol-functionalized magnetic biochar (MB–SH) was synthesized and utilized as an efficient sorbent for magnetic dispersive micro-solid-phase extraction (MD-µSPE) coupled with inductively coupled plasma mass spectrometry (ICP-MS) for the simultaneous determination of trace Pb(<small>II</small>), Cd(<small>II</small>), and Hg(<small>II</small>) in environmental water samples. The MB–SH material was prepared by functionalizing magnetic biochar with thiol groups, resulting in high-density chelating sites for heavy metal ions. The optimized MD-µSPE process allowed for quick preconcentration of target analytes in 3–5 minutes, with preconcentration factors ranging from 100 to 250. Under ideal circumstances (pH 5.5, 20 mg of sorbent, 250 mL sample volume, and 2 mL of eluent), the method obtained limits of detection at the ng L<small>⁻¹</small> level (0.5–1.2 ng L<small>⁻¹</small>), exceptional recoveries of 90–102%, and relative standard deviations of &lt;5%. The approach was successfully applied to both natural and industrial water samples, displaying good accuracy when compared to certified reference material (SRM 1643e). The MB–SH sorbent demonstrated good reusability for at least five cycles with low performance loss, providing a green, cost-effective, and sustainable alternative to trace heavy metal monitoring in aquatic environments.</p>","PeriodicalId":81,"journal":{"name":"Journal of Analytical Atomic Spectrometry","volume":" 4","pages":" 1354-1363"},"PeriodicalIF":3.1,"publicationDate":"2026-02-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147686502","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Optimization of laser-induced breakdown spectroscopy for Be element detection with self-absorption effect correction","authors":"Xiang Yu, Xuebin Su, Boping Li, Dan Zhao, Rui Yang, Zongyu Hou and Zhe Wang","doi":"10.1039/D5JA00463B","DOIUrl":"https://doi.org/10.1039/D5JA00463B","url":null,"abstract":"<p >The laser-induced breakdown spectroscopy detection of the Be element can provide on-site rapid detection technology in the field of geological exploration. The self-absorption effect of Be results in weaker detection accuracy in the medium to high content range. This study calculated the self-absorption parameters for the self-absorption effect of the Be element, and optimized the detection delay and laser energy with the goal of reducing the self-absorption effect. The influence of laser energy on the self-absorption effect with two different light collection angles was discussed through plasma imaging and spatially resolved spectroscopy. The variation in self-absorption with increasing energy is interpreted as the result of competition between two factors: the increase in plasma temperature and the increase in optical path length due to plasma volume expansion. The opposite trends observed in axial and radial spectroscopy are attributable to the different expansions of the plasma height and width. With optimized parameters, the calibration model was corrected for self-absorption effects, resulting in a linear detection range of 6 to 10 000 ppm, which broadens the range of on-site detection of Be containing minerals by LIBS.</p>","PeriodicalId":81,"journal":{"name":"Journal of Analytical Atomic Spectrometry","volume":" 4","pages":" 1364-1374"},"PeriodicalIF":3.1,"publicationDate":"2026-02-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://pubs.rsc.org/en/content/articlepdf/2026/ja/d5ja00463b?page=search","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147686503","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Rapid in situ laser digestion for high-precision barium isotope analysis of barite using double spike MC-ICP-MS","authors":"Shenghua Zhang, Zhaochu Hu, Lanping Feng, Wen Zhang, Tao Luo, Ming Li, Zaicong Wang, Keqing Zong and Shenghong Hu","doi":"10.1039/D5JA00446B","DOIUrl":"https://doi.org/10.1039/D5JA00446B","url":null,"abstract":"<p >Accurate isotope analysis of chemically resistant minerals such as barite remains a significant challenge due to their poor solubility and the labor-intensive nature of conventional sample preparation techniques. Here, we present a novel, rapid <em>in situ</em> laser digestion method for high-precision, high-spatial-resolution barium (Ba) isotope analysis of barite, using a <small>¹³⁵</small>Ba–<small>¹³⁷</small>Ba double spike and multi-collector inductively coupled plasma mass spectrometry (MC-ICP-MS). This rapid <em>in situ</em> laser digestion technique enables the instantaneous thermal decomposition of barite within a water microdroplet, followed by direct isotope analysis of the resulting solution after addition of the <small>¹³⁵</small>Ba–<small>¹³⁷</small>Ba double spike, eliminating the need for extensive sample pretreatment and chemical purification. Analysis of four natural barite samples using this method yielded <em>δ</em><small>^137/134</small>Ba values in excellent agreement with reference values, with long-term external precision better than ±0.05‰ (2SD). The proposed method significantly advances Ba isotope analysis, enabling rapid, high-precision measurements of insoluble minerals with minimal sample handling and high spatial resolution.</p>","PeriodicalId":81,"journal":{"name":"Journal of Analytical Atomic Spectrometry","volume":" 4","pages":" 1298-1304"},"PeriodicalIF":3.1,"publicationDate":"2026-02-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147686474","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A natural calcite reference material for microbeam oxygen and carbon isotope analysis","authors":"Yan Zhang, Zhian Bao, Yongfei Tian, Peng Liu, Peng Zhang, Deyi Peng, Jing Tian and Honglin Yuan","doi":"10.1039/D5JA00488H","DOIUrl":"https://doi.org/10.1039/D5JA00488H","url":null,"abstract":"<p >High-quality carbon and oxygen isotope data critically depend on the quality of reference materials used for instrumental calibration and data monitoring during <em>in situ</em> analysis. We present a new natural calcite reference material MNP for <em>in situ</em> carbon and oxygen isotope analysis by LA-MC-ICP-MS and SIMS, respectively. Extensive characterization by IRMS, LA-MC-ICP-MS and SIMS analyses demonstrated that MNP calcite is homogeneous in carbon and oxygen isotopes. Bulk isotope analyses yielded a mean <em>δ</em><small>¹³</small>C<small>_VPDB</small> of −6.81 ± 0.33‰ (2SD, <em>n</em> = 15) and a mean <em>δ</em><small>¹⁸</small>O<small>_VPDB</small> of −22.38 ± 0.41‰ (2SD, <em>n</em> = 15) across two independent laboratories. A total of 469 LA-MC-ICP-MS carbon isotope analyses of randomly selected calcite grains show homogeneous isotopic compositions with an average <em>δ</em><small>¹³</small>C<small>_VPDB</small> of −6.82 ± 0.40‰ (2SD, <em>n</em> = 469), consistent with the bulk analytical data. Carbon isotopic compositions determined from five LA-MC-ICP-MS sessions agree with those obtained by IRMS analysis, suggesting that MNP calcite is suitable as a matrix-matched calibration reference material. Moreover, a total of 80 SIMS oxygen isotope analyses of randomly selected calcite grains show consistent oxygen isotopic compositions with an average <em>δ</em><small>¹⁸</small>O<small>_VPDB</small> of −22.41 ± 0.32‰ (2SD, <em>n</em> = 80), consistent with bulk analyses. These findings suggest that MNP calcite is a homogeneous, matrix-matched reference material suitable for <em>in situ</em> carbon and oxygen isotope determinations.</p>","PeriodicalId":81,"journal":{"name":"Journal of Analytical Atomic Spectrometry","volume":" 4","pages":" 1290-1297"},"PeriodicalIF":3.1,"publicationDate":"2026-02-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147686473","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Three natural zircon reference materials for in situ Hf isotope analysis covering a wide range of 176Yb/177Hf ratios","authors":"Xiuhong Liao, Lili Lou, Lu Chen, Zhaochu Hu, Wen Zhang, Yue Wang, Tao Luo, Tao Chen and Junfeng Zhang","doi":"10.1039/D5JA00452G","DOIUrl":"https://doi.org/10.1039/D5JA00452G","url":null,"abstract":"<p >The radiogenic Hf isotopic composition (<small>¹⁷⁶</small>Hf/<small>¹⁷⁷</small>Hf) of zircon is a critical tracer in isotope geochemistry. However, the accuracy of <em>in situ</em> Hf isotope analysis is often compromised by isobaric interference from <small>¹⁷⁶</small>Yb on <small>¹⁷⁶</small>Hf, particularly in zircons with high Yb/Hf ratios (<small>¹⁷⁶</small>Yb/<small>¹⁷⁷</small>Hf &gt; 0.03). The limited availability of reference materials (RMs) with elevated Yb/Hf ratios for instrument optimisation and quality control remains an important challenge. In this study, three potential zircon RMs with a range of Yb/Hf ratios (ML-2, US-2, and MADA) were characterised for <em>in situ</em> Hf isotope analysis. These materials are demonstrated to be homogeneous at the micrometre scale in Hf isotopic composition by laser ablation MC-ICP-MS, with <small>¹⁷⁶</small>Yb/<small>¹⁷⁷</small>Hf values clustered at &lt;0.01, 0.03–0.11, and 0.08–0.16, respectively. The results show that high-Yb zircons can exhibit substantial bias and increased scatter in measured <small>¹⁷⁶</small>Hf/<small>¹⁷⁷</small>Hf during <em>in situ</em> analysis, whereas commonly used low-Yb RMs (<em>e.g.</em>, PLE, Mud Tank, and Tanz) yield accurate and consistent results. Introducing N<small>₂</small> into the central gas flow expands the axial ion beam distribution, thereby stabilising mass bias and enabling accurate <small>¹⁷⁶</small>Hf/<small>¹⁷⁷</small>Hf determination even for high-Yb/Hf zircons. It is therefore strongly recommended that RMs with comparable or higher Yb/Hf ratios than the unknown samples be used for instrument optimisation and quality control during <em>in situ</em> Hf isotope analysis of high-Yb zircons and that sufficient addition of N<small>₂</small> be applied, as it has proven highly effective under such analytical conditions.</p>","PeriodicalId":81,"journal":{"name":"Journal of Analytical Atomic Spectrometry","volume":" 4","pages":" 1305-1315"},"PeriodicalIF":3.1,"publicationDate":"2026-02-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147686475","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A dual-standard matrix-matched calibration strategy for LA-ICP-MS elemental quantitative imaging of calcium oxalate–uric acid dual-matrix urinary stones","authors":"Xinyi Chen, Qingling Zhou, Duoduo Ao, Hui Hu, Hui Xu, Tengfei Zheng, Yongmei Hu, Ying Ye, Xiaoqing Yi, Jianzong Zhou and Yuqiu Ke","doi":"10.1039/D5JA00442J","DOIUrl":"https://doi.org/10.1039/D5JA00442J","url":null,"abstract":"<p >Laser ablation-inductively coupled plasma-mass spectrometry (LA-ICP-MS) is a powerful technique for spatially resolved elemental imaging; however, its application in urinary stones, which often comprise mixed matrices such as calcium oxalate (CaOx) and uric acid (UA), presents significant challenges in matching the sample matrix with an appropriate matrix-matched external standard, especially when processing tens of thousands of LA-ICP-MS data points typically required for elemental imaging. This study presents a novel strategy that utilizes calcium (Ca) as a matrix tracer to distinguish between CaOx and UA components in complex urinary stones. Twelve consecutive quadrupole readouts of each scan were grouped, and a <em>t</em>-test was applied to identify matrix boundaries. This method enables the precise identification of boundaries on the scale of tens of micrometers that are indistinguishable to the naked eye in micrographs. Two matrices were thus identified, and a dual-standard calibration strategy was developed using in-house CaOx-1 and UA-6 reference pellets, enabling accurate and reproducible elemental quantification. This approach significantly reduces analytical errors arising from inappropriate selection of external or internal standards, previously estimated as −84% for Mg and up to 183% for Zn. The resulting elemental distribution images uncovered distinct compositional layering, which significantly improves the analytical performance of LA-ICP-MS in studying complex urinary stone compositions and holds promise for advancing research on their pathogenesis and treatment.</p>","PeriodicalId":81,"journal":{"name":"Journal of Analytical Atomic Spectrometry","volume":" 4","pages":" 1199-1207"},"PeriodicalIF":3.1,"publicationDate":"2026-02-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147686460","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}