Spectrochimica Acta Part B: Atomic Spectroscopy最新文献

{"title":"Investigation of chromatographic procedures for the analysis of cationic impurities in uranium and plutonium matrices by ICP-OES and ICP-MS","authors":"Marion Hernandez,&nbsp;Alexandre Quemet,&nbsp;Laure Montreuil,&nbsp;Christophe Maillard,&nbsp;Sarah Baghdadi","doi":"10.1016/j.sab.2025.107136","DOIUrl":"10.1016/j.sab.2025.107136","url":null,"abstract":"<div><div>Four different separation protocols were tested to analyze several cations in a U-Pu matrix by inductively coupled plasma – optical emission spectrometry (ICP-OES) or mass spectrometry (ICP-MS): UTEVA resin with HNO₃ eluent, UTEVA resin with HNO₃/H₂C₂O₄ eluent, UTEVA resin with HNO₃/H₂O₂ eluent and TEVA resin with HNO₃ eluent. It was shown that none of the twenty nine tested cations (Al, Ag, B, Ca, Cd, Ce, Cr, Cu, Fe, Ga, La, Mg, Mn, Mo, Na, Nd, Ni, Pb, Pd, Rh, Sb, Se, Si, Sn, Sr, Ti, V, Y and Zn) was retained onto the resin, with recovery yields between 80 and 120 %. Meanwhile, the U-Pu matrix was retained onto the resin and was eliminated from the fraction containing the cations. After initial testing, two of the protocols were chosen: UTEVA resin with HNO₃/H₂C₂O₄ eluent and UTEVA resin with HNO₃/H₂O₂ eluent thanks to their efficacy and practicality. Then, the two selected protocols were applied to a uranium oxide certified reference material to validate them. Twenty three out of the thirty one impurities presents in the material (Ag, Ba, Be, Bi, Cd, Co, Cr, Cu, Dy, Eu, Fe, Gd, In, Li, Mo, Ni, Pb, Sm, Sn, Ti, V, W and Zr) were determined with good recoveries. Th was fixed onto the resin. Based on theses results, it seems possible to analyze the forty one impurities in a U-Pu material by optimizing the operating conditions. These two protocols were used to study the presence of impurities in a Pu-based material to ensure the purity of the materials. Detection limits in the order of μg g⁻¹ powder were obtained.</div></div>","PeriodicalId":21890,"journal":{"name":"Spectrochimica Acta Part B: Atomic Spectroscopy","volume":"225 ","pages":"Article 107136"},"PeriodicalIF":3.2,"publicationDate":"2025-01-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143369596","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":"Impact of soldering temperatures on heavy metal and dust emissions: A LIBS-based environmental pollution analysis","authors":"Nuerbiye Aizezi ,&nbsp;Yanpeng Ye ,&nbsp;Ziang Chen ,&nbsp;Yuzhu Liu","doi":"10.1016/j.sab.2025.107124","DOIUrl":"10.1016/j.sab.2025.107124","url":null,"abstract":"<div><div>Soldering is a critical operation in various industrial sectors, however, the pollution generated by this process is emerging as a significant environmental concern. This study utilizes Laser-Induced Breakdown Spectroscopy (LIBS) for real-time analysis of contaminants produced during soldering, with a particular focus on heavy metals such as lead (Pb) and tin (Sn). The research examines the elemental composition of soldering fumes, including variations in heavy metal content, dynamic changes in carbon and particle distribution of PM2.5, PM10, and Total Suspended Particles (TSP) in workers' breathing zones. The results indicated that rising temperatures significantly enhanced the evaporation of lead and tin. Concurrently, the intensity of carbon spectral lines exhibited a pronounced upward trend. The concentrations of PM2.5 and PM10 particulate matter increased significantly with operating temperature increments. PM2.5 required substantially more time than PM10 and total particulate matter (TPM) to reach its peak concentration within the workers' breathing zone. Furthermore, Pearson's correlation analysis between temperature and elemental intensity revealed correlation coefficients exceeding 0.8 for both Pb and Sn, highlighting a strong linear relationship with temperature. This finding was further corroborated by the Principal Component Analysis (PCA)-based correlation analysis between temperature and element intensity, with the coefficient of determination (R²) reaching 0.89. This research highlights the potential health risks associated with soldering fumes, particularly regarding the presence of heavy metals and harmful gases, and underscores the importance of regulating soldering practices to mitigate environmental pollution risks.</div></div>","PeriodicalId":21890,"journal":{"name":"Spectrochimica Acta Part B: Atomic Spectroscopy","volume":"225 ","pages":"Article 107124"},"PeriodicalIF":3.2,"publicationDate":"2025-01-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143369594","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":"Online elemental characterization of collimated nanoaerosols by laser-induced breakdown spectroscopy of isolated particles","authors":"Cesar Alvarez-Llamas ,&nbsp;Nathalie Herlin-Boime ,&nbsp;Jean-Baptiste Sirven ,&nbsp;Olivier Sublemontier","doi":"10.1016/j.sab.2025.107122","DOIUrl":"10.1016/j.sab.2025.107122","url":null,"abstract":"<div><div>We present a new setup for the online elemental characterization of nanoaerosols during their gas-phase synthesis using Laser-Induced Breakdown Spectroscopy (LIBS). This system involves the interaction of a kHz rate pulsed laser with a collimated jet of particles under vacuum conditions (10⁻² mbar). The low-pressure interaction reduces spectral line broadening, enhances spectral resolution, and eliminates the background continuum from the laser-gas interaction, improving LIBS detection capabilities. A sampling stage has also been incorporated into the design, enabling the continuous analysis of nanoaerosols during their high-throughput synthesis. This feature enhances the instrument's versatility and opens new possibilities for studying nanoparticle formation and properties in situ and in real-time.</div><div>The proof of concept was produced by an experiment of online elemental analysis of Li₂TiO₃ nanoparticles during their synthesis by laser pyrolysis. The monitoring of the LIBS emission signal of the particles in real time was demonstrated by measuring the signals from the three elements together with data conditional analysis to extract the events information. Moreover, the specific detection of Li signals was achieved in a single-nanoparticle detection mode, enabling it to reach an absolute detection limit of 150 ag. The collimation step of particles in a jet, combined with a high repetition rate laser, opens the way to specific monitoring of low-density aerosols in the sub-micrometer range.</div></div>","PeriodicalId":21890,"journal":{"name":"Spectrochimica Acta Part B: Atomic Spectroscopy","volume":"225 ","pages":"Article 107122"},"PeriodicalIF":3.2,"publicationDate":"2025-01-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143369592","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":"Quantitative analysis of dysprosium in coated NdFeB used magnets by laser-induced breakdown spectroscopy for sorting prior to recycling","authors":"J.-B. Sirven ,&nbsp;C. Quéré ,&nbsp;J. Maisonneuve ,&nbsp;B. Richebé","doi":"10.1016/j.sab.2025.107123","DOIUrl":"10.1016/j.sab.2025.107123","url":null,"abstract":"<div><div>Permanent magnets containing strategic rare earth elements (REE) such as Nd, Pr or Dy are being used more and more around the world, and their recycling is becoming a major stake in a context of virtual monopoly of China on the production of REEs. This paper addresses the sorting of solid used NdFeB magnets upstream of a recycling process. Dysprosium was chosen as representative of heavy REEs, and the LIBS technique was selected to perform online quantitative analysis under a residual coating or oxidation layer when present.</div><div>The studies were carried out using two different LIBS systems. The first one was a commercial laboratory equipment with a short-range working distance of 30 cm. Laser ablation conditions were optimized based on the LIBS signal intensity and stability, on the shot-to-shot signal evolution, and on the quality of the calibration curve. This led to 60 pre-ablation shots and 40 analysis shots. Under these conditions, we showed the feasibility of quantifying the dysprosium content under a depth of 35 to 60 μm with a relative uncertainty of less than 10 % at 95 % confidence.</div><div>The second LIBS system was a homemade setup designed to make measurements at 1 m distance, a working range representative of a possible online implementation above a conveyor belt. The ablation efficiency of this system was found much too low, but it was considerably increased by using the laser in the free-running mode. In the standard Q-switched mode, the results also showed the feasibility of quantifying dysprosium with uncertainties of the same order than with the short-range equipment.</div></div>","PeriodicalId":21890,"journal":{"name":"Spectrochimica Acta Part B: Atomic Spectroscopy","volume":"225 ","pages":"Article 107123"},"PeriodicalIF":3.2,"publicationDate":"2025-01-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143369552","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":"Isotopic analysis of liquid lithium via laser-produced vapor for laser-induced breakdown spectroscopy","authors":"Tuyen Ngoc Tran ,&nbsp;Duksun Han ,&nbsp;Sungyong Shim ,&nbsp;Dae Hyun Choi","doi":"10.1016/j.sab.2025.107121","DOIUrl":"10.1016/j.sab.2025.107121","url":null,"abstract":"<div><div>To realize fusion energy in the near future, tritium self-sufficiency is an essential technology in the deuterium-tritium (²H<img>³H) fuel cycle. Thus, high 6‑lithium (⁶Li) isotope enrichment is desirable to improve the performance of the fusion plant. Additionally, a fast and reliable analysis method for measuring the abundance of Li isotopes is also essential. A novel isotope analysis technique for liquid Li samples, called laser-produced vapor for laser-induced breakdown spectroscopy (LPV-LIBS), has been developed and introduced to measure isotopic abundance. The LPV-LIBS technique combines LPV, in which elements in the liquid samples are vaporized by a high-power pulse laser, and LIBS, in which the laser-induced plasmas are analyzed through optical emission spectroscopy. Li spectra of the 2 s-2p transition line were measured and analyzed, and the results were consistent with those of the reference samples of liquid LiCl employing the developed LPV-LIBS. This is a promising simple and rapid method for measuring the Li isotopic abundance in fusion applications and for other industrial needs.</div></div>","PeriodicalId":21890,"journal":{"name":"Spectrochimica Acta Part B: Atomic Spectroscopy","volume":"225 ","pages":"Article 107121"},"PeriodicalIF":3.2,"publicationDate":"2025-01-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143369549","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":"UiO-66-NH2@tannic acid-assisted solid-phase extraction combined with laser-induced breakdown spectroscopy for sensitive detection of Pb (II) in aquatic products","authors":"Kaiqiang Wang ,&nbsp;Xiaoyan Duan ,&nbsp;Ye Tian ,&nbsp;Hong Lin ,&nbsp;Limin Cao ,&nbsp;Jianxin Sui","doi":"10.1016/j.sab.2025.107120","DOIUrl":"10.1016/j.sab.2025.107120","url":null,"abstract":"<div><div>In this work, a novel method for sensitive detecting heavy metal Pb (II) in aquatic products was developed using UiO-66-NH₂@tannic acid (UiO-66-NH₂@TA) solid-phase extraction combined with laser-induced breakdown spectroscopy (LIBS). UiO-66-NH₂@TA adsorbent could effectively extract Pb (II) from the digestive solution of aquatic products. Characterization of the morphology of the adsorbent was performed using transmission electron microscopy and scanning electron microscopy. The optimal experimental conditions for LIBS detection, including sample preparation, substrate type, laser energy, and delay time, were investigated. The results showed that the strongest Pb I 405.7 nm spectral signal can be obtained by dripping UiO-66-NH₂@TA adsorbent onto a silicon wafer for LIBS testing. The limit of detection and limit of quantification for Pb (II) in aqueous solution were 0.18 μg/mL and 0.61 μg/mL, respectively. The calibration curve demonstrated good sensitivity and accuracy for Pb (II) detection with a correlation coefficient of 0.9905. Spiked recovery experiments on large yellow croakers and scallops yielded recovery rates of 75.25 % - 99.08 %, which was consistent with the results from atomic absorption spectrometry. This study underscores the potential of the solid-phase extraction combined with laser-induced breakdown spectroscopy for practical application in food safety monitoring, demonstrating its effectiveness and reliability in detecting Pb (II) in aquatic products.</div></div>","PeriodicalId":21890,"journal":{"name":"Spectrochimica Acta Part B: Atomic Spectroscopy","volume":"225 ","pages":"Article 107120"},"PeriodicalIF":3.2,"publicationDate":"2025-01-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143369548","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":"Quantifying the accurate content of 107Pd in a radioactive effluent using the isotope dilution technique and multi-collector ICP-MS","authors":"Majd Shmeit,&nbsp;Marina Faure,&nbsp;Celine Gautier,&nbsp;Hélène Isnard","doi":"10.1016/j.sab.2025.107119","DOIUrl":"10.1016/j.sab.2025.107119","url":null,"abstract":"<div><div>The radionuclide ¹⁰⁷Pd is a long-lived fission product that decays to ¹⁰⁷Ag by β⁻ emission. The accurate quantification of the ¹⁰⁷Pd content in nuclear waste is essential in compliance with international regulations on the long-term storage of radioactive waste. Moreover, fission-produced Pd holds an economic interest through its recycling for industrial purposes. The accurate quantification of ¹⁰⁷Pd is presently problematic due to the absence of a commercial reference material certified for ¹⁰⁷Pd content, and because of the scarcity of ¹⁰⁷Pd-concentrated materials. In this study, we accurately characterize a purified radioactive effluent for its ¹⁰⁷Pd content using multicollector (MC)-ICP-MS and the isotope dilution technique. The developed isotope-dilution method is based on the preparation and calibration of a ¹⁰⁸Pd-enriched commercial spike solution. The repeatability of Pd isotope ratios in the radioactive effluent as obtained by MC-ICP-MS was on the order of 0.05 % (2*standard deviation of <em>n</em> = 15 measurements). The ¹⁰⁷Pd content in the radioactive effluent was accurately quantified with an expanded uncertainty of 0.7 % at <em>k</em> = 2. The results obtained from the radioactive effluent are metrologically traceable to the International System of Units (SI). Lastly, the sources of uncertainty and their relative contribution on the final expanded uncertainty were determined and evaluated.</div></div>","PeriodicalId":21890,"journal":{"name":"Spectrochimica Acta Part B: Atomic Spectroscopy","volume":"225 ","pages":"Article 107119"},"PeriodicalIF":3.2,"publicationDate":"2025-01-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143369547","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":"Investigation of isotope shifts and Stark shifts in the strontium Rydberg state via 5s21S0→5s5p1P10→5p1/25p1/2→4d3/2nljn∗=39.4","authors":"Chao Zhang ,&nbsp;Ryohei Terabayashi ,&nbsp;Shuichi Hasegawa","doi":"10.1016/j.sab.2025.107118","DOIUrl":"10.1016/j.sab.2025.107118","url":null,"abstract":"<div><div>Resonance Ionization Spectrometry (RIS) is a highly sensitive analytical technique that utilizes differences in atomic structure between isotopes to achieve isotope selectivity. In recent years, multi-step resonance transitions have been developed to excite target isotopes from the ground state to high Rydberg states, simultaneously enhancing isotope selectivity and ionization efficiency, thereby improving the overall detection sensitivity of RIS. This study investigates a three-step RIS scheme <span><math><mo>(</mo><mn>5</mn><msup><mi>s</mi><mrow><mn>2</mn><mspace></mspace><mn>1</mn></mrow></msup><msub><mi>S</mi><mn>0</mn></msub><mo>→</mo><mn>5</mn><mi>s</mi><mn>5</mn><msup><mi>p</mi><mn>1</mn></msup><msubsup><mi>P</mi><mn>1</mn><mn>0</mn></msubsup><mo>→</mo><mn>5</mn><msub><mi>p</mi><mrow><mn>1</mn><mo>/</mo><mn>2</mn></mrow></msub><mn>5</mn><msub><mi>p</mi><mrow><mn>1</mn><mo>/</mo><mn>2</mn></mrow></msub><mo>→</mo><mn>4</mn><msub><mi>d</mi><mrow><mn>3</mn><mo>/</mo><mn>2</mn></mrow></msub><msub><mi>nl</mi><mi>j</mi></msub><mspace></mspace><mfenced><mrow><msup><mi>n</mi><mo>∗</mo></msup><mo>=</mo><mn>39.4</mn></mrow></mfenced></math></span>) for Sr isotope analysis, the isotope shifts of natural Sr isotopes were measured in the first and second transitions (<span><math><mn>5</mn><msup><mi>s</mi><mrow><mn>2</mn><mspace></mspace><mn>1</mn></mrow></msup><msub><mi>S</mi><mn>0</mn></msub><mo>→</mo><mn>5</mn><mi>s</mi><mn>5</mn><msup><mi>p</mi><mn>1</mn></msup><msubsup><mi>P</mi><mn>1</mn><mn>0</mn></msubsup><mo>→</mo><mn>5</mn><msub><mi>p</mi><mrow><mn>1</mn><mo>/</mo><mn>2</mn></mrow></msub><mn>5</mn><msub><mi>p</mi><mrow><mn>1</mn><mo>/</mo><mn>2</mn></mrow></msub></math></span>), and the isotope shift for Sr-90 relative to Sr-88 was estimated. Additionally, Stark shifts of Sr-88 atoms in the Rydberg state under various external electric field conditions were precisely measured using a pulsed electric field. The results revealed that the external static electric fields caused energy level shifts for Sr-88 Rydberg atoms, with opposite directions. Furthermore, as the field strength increased, a transition from quadratic to linear Stark shifts was observed. These findings provide theoretical support for improving spectral resolution and transition selectivity in RIS methods involving Rydberg states. The detailed analysis of Rydberg state behavior under electric fields also offers valuable data for evaluating and compensating for field-induced perturbations in final energy level transitions, and serves as a reference for applying RIS to other elements or systems in similar Rydberg states for complex analyses.</div></div>","PeriodicalId":21890,"journal":{"name":"Spectrochimica Acta Part B: Atomic Spectroscopy","volume":"225 ","pages":"Article 107118"},"PeriodicalIF":3.2,"publicationDate":"2025-01-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143369551","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":"Outside Front Cover - Journal name, Cover image, Volume issue details, ISSN, Cover Date, Elsevier Logo and Society Logo if required","authors":"","doi":"10.1016/S0584-8547(24)00244-1","DOIUrl":"10.1016/S0584-8547(24)00244-1","url":null,"abstract":"","PeriodicalId":21890,"journal":{"name":"Spectrochimica Acta Part B: Atomic Spectroscopy","volume":"223 ","pages":"Article 107099"},"PeriodicalIF":3.2,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143097150","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":"Non-linear intensity response in glow discharge emission spectroscopy: Excitation, radiative transfer and self-absorption","authors":"Zdeněk Weiss","doi":"10.1016/j.sab.2024.107109","DOIUrl":"10.1016/j.sab.2024.107109","url":null,"abstract":"<div><div>A comprehensive treatment is presented of signal response in glow discharge emission spectroscopy as function of the analyte concentration and the sputter rate of the sample matrix. Deviations from linear response are expressed by 1/Γ factors. Atomization, excitation, radiative transfer and self-absorption in the Grimm-type discharge is discussed. Experimental data on non-linear intensity response, line profiles of selected lines and some matrix effects are presented in the spectra of copper and zinc in the analysis of CuZnAl alloys and in the spectra of Fe, Ni, Cr. Plausible explanations of the findings are offered, based on the fundamentals of the discharge. Besides self-absorption, non-linear intensity response can also be caused by selective excitation processes due to heavy particle collisions, and even an apparent enhancement of some lines with a rising analyte concentration, a trend opposite to that caused by self-absorption. Charge transfer from argon ions to the atoms of some analyte elements is involved and other heavy particle reactions affecting the spectra, that may be occurring on the cathode surface or in its close vicinity. Similarities and differences with other analytical plasmas are discussed, including laser-induced breakdown spectroscopy.</div></div>","PeriodicalId":21890,"journal":{"name":"Spectrochimica Acta Part B: Atomic Spectroscopy","volume":"225 ","pages":"Article 107109"},"PeriodicalIF":3.2,"publicationDate":"2024-12-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143369593","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}