The accurate analysis of the elemental composition plays a crucial role in the research of functional materials.The emitting characteristic x-ray fluorescence(XRF)photons can be used for precisely discriminating the s...The accurate analysis of the elemental composition plays a crucial role in the research of functional materials.The emitting characteristic x-ray fluorescence(XRF)photons can be used for precisely discriminating the specified element.The detection accuracy of conventional XRF methodology using semiconductor detector is limited by the energy resolution,thus posing a challenge in accurately scaling the actual energy of each XRF photon.We adopt a novel high-resolution x-ray spectrometer based on the superconducting transition-edge sensor(TES)for the XRF spectroscopy measurement of different elements.Properties including high energy resolution,high detection efficiency and precise linearity of the new spectrometer will bring significant benefits in analyzing elemental composition via XRF.In this paper,we study the Ledge emission line profiles of three adjacent rare earth elements with the evenly mixed sample of their oxide components:terbium,dysprosium and holmium.Two orders of magnitude better energy resolution are obtained compared to a commercial silicon drift detector.With this TES-based spectrometer,the spectral lines overlapped or interfered by background can be clearly distinguished,thus making the chemical component analysis more accurate and quantitative.A database of coefficient values for the line strength of the spectrum can then be constructed thereafter.Equipped with the novel XRF spectrometer and an established coefficient database,a direct analysis of the composition proportion of a certain element in an unknown sample can be achieved with high accuracy.展开更多
Laser induced breakdown spectroscopy (LIBS) can be used to determine solid, liquid, colloi-dal, and biological samples. It is a promising technique for analysis and characterization of the composition of a broad varie...Laser induced breakdown spectroscopy (LIBS) can be used to determine solid, liquid, colloi-dal, and biological samples. It is a promising technique for analysis and characterization of the composition of a broad variety of objects. This review describes in brief the basic prin-ciples and technological aspects of LIBS, and the most recent progress of the various ap-plications of this technique in biomedicine fields will be reviewed in detail, including bio-aerosols detection and identification, tis-sue analysis, mineral analysis in human body, and detection of zinc in human skin. Finally new approaches and the prospects in bio-medicine fields of LIBS technique are de-scribed.展开更多
Ion-absorption rare earth ores are an important mineral resource in China.Nowadays,the unauthorized mining has become a serious problem,resulting in severe water pollution and the wastage of rare earth elements(REEs)....Ion-absorption rare earth ores are an important mineral resource in China.Nowadays,the unauthorized mining has become a serious problem,resulting in severe water pollution and the wastage of rare earth elements(REEs).Being able to estimate the concentration of dissolved REEs in water bodies near mines is essential for tackling this environmental problem.Conventionally,quantitative analyses of the contents of dissolved REEs are performed using laboratory-based techniques,which can be time consuming and costly.Spectral reflectance is a rapid and cost-effective means of characterizing the chemical compositions of light-absorbing materials.In this study,reflectance spectroscopy was performed on dissolved REEs,and the correlation between their reflectance characteristics and REE content was determined.A total of 50 aqueous media samples collected in south Jiangxi Province and 25 laboratory-produced aqueous media samples were tested,and their reflectance spectra and REE contents were measured using reflectance spectroscopy and inductively coupled plasma mass spectrometry,respectively.Next,the reflectance,differential reflectance,and absorption depth were analysed based on the REE content.Six diagnostic absorption features related to REEs are recognised in the visible and near-infrared wavelength regions,along with several smaller peaks.It indicates that the results of the absorption depth analysis are in accordance with the absorption spectra characteristics of the REEs,with the R2 value being higher than 0.97.The intensity of each of the six absorption bands exhibits a linear correlation to the total REE content.Therefore,linear regressio n models can be derived for estimating the total concentration of REEs in aqueous media samples.What’s more,the detection limit for REEs is determined to be about 30μg/L.Thus,it can be concluded that reflectance spectroscopy is a suitable technique for estimating the concentration of dissolved REEs.展开更多
基金the National Major Scientific Research Instrument Development Project(Grant No.11927805)the National Key Research and Development Program of China(Grant No.2022YFF0608303)+2 种基金the NSFC Young Scientists Fund(Grant No.12005134)the Shanghai-XFEL Beamline Project(SBP)(Grant No.31011505505885920161A2101001)the Shanghai Municipal Science and Technology Major Project(Grant No.2017SHZDZX02)。
文摘The accurate analysis of the elemental composition plays a crucial role in the research of functional materials.The emitting characteristic x-ray fluorescence(XRF)photons can be used for precisely discriminating the specified element.The detection accuracy of conventional XRF methodology using semiconductor detector is limited by the energy resolution,thus posing a challenge in accurately scaling the actual energy of each XRF photon.We adopt a novel high-resolution x-ray spectrometer based on the superconducting transition-edge sensor(TES)for the XRF spectroscopy measurement of different elements.Properties including high energy resolution,high detection efficiency and precise linearity of the new spectrometer will bring significant benefits in analyzing elemental composition via XRF.In this paper,we study the Ledge emission line profiles of three adjacent rare earth elements with the evenly mixed sample of their oxide components:terbium,dysprosium and holmium.Two orders of magnitude better energy resolution are obtained compared to a commercial silicon drift detector.With this TES-based spectrometer,the spectral lines overlapped or interfered by background can be clearly distinguished,thus making the chemical component analysis more accurate and quantitative.A database of coefficient values for the line strength of the spectrum can then be constructed thereafter.Equipped with the novel XRF spectrometer and an established coefficient database,a direct analysis of the composition proportion of a certain element in an unknown sample can be achieved with high accuracy.
文摘Laser induced breakdown spectroscopy (LIBS) can be used to determine solid, liquid, colloi-dal, and biological samples. It is a promising technique for analysis and characterization of the composition of a broad variety of objects. This review describes in brief the basic prin-ciples and technological aspects of LIBS, and the most recent progress of the various ap-plications of this technique in biomedicine fields will be reviewed in detail, including bio-aerosols detection and identification, tis-sue analysis, mineral analysis in human body, and detection of zinc in human skin. Finally new approaches and the prospects in bio-medicine fields of LIBS technique are de-scribed.
基金supported by the China Geological Survey Project(DD20190379)the Strategic Priority Research Program of the Chinese Academy of Sciences(XDA20070304)+3 种基金the Fundamental Research Funds for the Institute of Mineral ResourcesChinese Academy of Geological Sciences(KK1919)the Fundamental Research Funds for the Institute of GeologyChinese Academy of Geological Sciences(J2004)。
文摘Ion-absorption rare earth ores are an important mineral resource in China.Nowadays,the unauthorized mining has become a serious problem,resulting in severe water pollution and the wastage of rare earth elements(REEs).Being able to estimate the concentration of dissolved REEs in water bodies near mines is essential for tackling this environmental problem.Conventionally,quantitative analyses of the contents of dissolved REEs are performed using laboratory-based techniques,which can be time consuming and costly.Spectral reflectance is a rapid and cost-effective means of characterizing the chemical compositions of light-absorbing materials.In this study,reflectance spectroscopy was performed on dissolved REEs,and the correlation between their reflectance characteristics and REE content was determined.A total of 50 aqueous media samples collected in south Jiangxi Province and 25 laboratory-produced aqueous media samples were tested,and their reflectance spectra and REE contents were measured using reflectance spectroscopy and inductively coupled plasma mass spectrometry,respectively.Next,the reflectance,differential reflectance,and absorption depth were analysed based on the REE content.Six diagnostic absorption features related to REEs are recognised in the visible and near-infrared wavelength regions,along with several smaller peaks.It indicates that the results of the absorption depth analysis are in accordance with the absorption spectra characteristics of the REEs,with the R2 value being higher than 0.97.The intensity of each of the six absorption bands exhibits a linear correlation to the total REE content.Therefore,linear regressio n models can be derived for estimating the total concentration of REEs in aqueous media samples.What’s more,the detection limit for REEs is determined to be about 30μg/L.Thus,it can be concluded that reflectance spectroscopy is a suitable technique for estimating the concentration of dissolved REEs.
