JOURNAL OF LUMINESCENCE
·
2017
·
IF 2.686
Junqian Zhao,Huaina Yu,Shusheng Pan,Shang Zhou,Li Zhong,Hua Wang,Yuan Yuan Luo,SiuFung Yu,Guanghai Li
CsPbI 3 sub-micrometer wires were synthesized by one-pot solution method at near room temperature . The wires are single crystalline with [100] orientation. An strong emission band centered at 470 nm was observed under ultraviolet excitation, and the emission intensity and bandwidth are dependent on the molar ratio of CsI/PbI 2 in the wires. A bright green emission with a lifetime of several tens ns was observed when excited with a soft X-ray, and the spectral response range can be modulated by the molar ratio of CsI/PbI 2 in the wires. The growth mechanism of the wires was discussed, and the influences of the cycling strain and X-ray irrigation time on the X-ray excited optical luminescence of the CsI/PbI 2 wires/PET film were analyzed and discussed.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
International Journal of Environmental Research and Public Health
·
2017
·Vol. 14
·期 10
·1163
·
IF 2.101
Fang Li,Anxiang Lu,Jihua Wang
A modeling method based on discrete wavelet transform (DWT) was introduced to analyze the concentration of chromium, copper, zinc, arsenic and lead in soil with a portable X-ray fluorescence (XRF) spectrometer. A total of 111 soil samples were collected and observed. Denoising and baseline correction were performed on each spectrum before modeling. The optimum conditions for pre-processing were denoising with Coiflet 3 on the 3rd level and baseline correction with Coiflet 3 on the 9th level. Calibration curves were established for the five heavy metals (HMs). The detection limits were compared before and after the application of DWT, the qualitative detection limits and the quantitative detection limits were calculated to be three and ten times as high as the standard deviation with silicon dioxide (blank), respectively. The results showed that the detection limits of the instrument using DWT were lower, and that they were below national soil standards; the determination coefficients (R2) based on DWT-processed spectra were higher, and ranged from 0.990 to 0.996, indicating a high degree of linearity between the contents of the HMs in soil and the XRF spectral characteristic peak intensity with the instrument measurement.Keywords:X-ray fluorescence;heavy metal;soil;wavelet transform
研究领域:
环境科学
·
分析化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Kuwait Journal of Science
·
2023
·
IF 1.4
Sewgil Saaduldeen Anwer
The current study aimed to determine the major and minor elements in different algal species using energy dispersive x-ray fluorescence (EDXRF). Eight microalgae were isolated, and the dry powder of biomass was pressed for EDXRF. The results showed all chemical compositions in each of the isolates. The major elements were detected as Ca, K, Cl, Si, Mg, and Mn, respectively, with high concentrations in percentages for most algal species including Chara hispida, Chara spp , Chlorella vulgaris, Chlorella spp , Chlorella spp , and Spirogyra turfosa. The minor elements with low percentages were detected as Mn, S, Fe, Al, P and Sr. Whereas the major elements for Spirulina platensis and Nostoc punctiforme were detected as Fe, K, S, the minor elements were seen to include Ca, Cl, Si, Mg, and Mn. There are very few studies that determine the elements in microalgae with EDXRF, which is a rapid, easy method to determine what components and in what quantities they are contained to be used (no chemical pre-treatments are required). Algae contain elements like iron, and calcium, which are vital microelements for dietary intake and metabolism in humans. Algae could be useful if further studies are done on the efficiency of microalgae for calcium and iron absorption in human subjects.
研究领域:
生物学
·
环境科学
✓ 已验证
DOI
高影响因子
BIOLOGICAL TRACE ELEMENT RESEARCH
·
2024
·
IF 3.4
Wu Shihao,Zhao Peng,Wang Aihua,Dong Linpei,Wu Xiaojun,Wang Jifen,Zhang Yunfeng
Monochromatic excitation X-ray fluorescence (ME-XRF) spectrometry emerges as a novel technique in trace element analysis, distinguished by its simplicity, rapidity, and efficiency. Its application in forensic toxicology has grown significantly for identifying toxic trace metals in biological samples. This study further expands its utility by developing a method for the rapid determination of arsenic (As), mercury (Hg), thallium (Tl), and lead (Pb) in hair samples. Calibration curves were established using analytical reference samples, and optimal detection conditions were determined and validated. The LODs for As, Hg, Tl, and Pb were 0.03, 0.03, 0.03, and 0.05 μg g −1 , respectively. Method precision was evaluated through seven parallel analyses of samples within the concentration range of 0.27 to 20.051 μg g⁻ 1 , with relative standard deviations (RSDs) consistently below 10%. The feasibility of the ME-XRF technique for forensic toxicology analysis was validated through the analysis of authentic poisoned hair samples collected from the animal experiment.
研究领域:
分析化学
·
法医学
·
环境科学
✓ 已验证
DOI
PubMed
高影响因子
LUMINESCENCE
·
2024
·Vol. 39
·期 11
·e70013
·
IF 3.2
Qi Tan,Bingliang Gao,Pengde Gao,Chao Fan,Haijun Li
The future production of electrolytic aluminum will be characterized by low temperature, low carbon emissions, and environmental friendliness, which will result in a more complex electrolyte system. Real-time analysis of electrolytes can significantly enhance the efficiency of the electrolytic process. However, accurately analyzing the composition of complex aluminum electrolytes online has been a technical challenge. This research primarily focuses on determining the ingredient contents of complex aluminum electrolytes based on elemental concentrations measured using X-ray fluorescence (XRF) according to an applicable standard. Calibration curves were established based on 53 standard samples of complex aluminum electrolytes to establish relationships between XRF fluorescence intensity and real concentrations. Analysis conducted on industrial complex electrolytes confirms that these newly constructed curves effectively reduce relative errors to less than 3%. Additionally, a feasible solution is proposed for determining the cryolite ratio (CR) in aluminum electrolytes using XRF. Results demonstrate an average deviation as low as approximately 0.02, fully meeting industrial production requirements. This technique offers numerous benefits including rapid analysis, ease of use, and cost savings.
研究领域:
冶金学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF FOOD COMPOSITION AND ANALYSIS
·
2025
·
IF 4.6
Jian Xiao,A.-Lin Xia,Tao Geng
In order to accurately quantify the content of light elements in food samples, a method based on portable energy dispersive X-ray fluorescence (p-XRF) technology combined with second-order calibration algorithm was proposed to simultaneously quantify phosphorus (P), sulfur (S), potassium (K) and calcium (Ca) in different food samples. Firstly, the XRF response signal matrix of each food sample was obtained by changing the test current and voltage. Secondly, the alternating penalty trilinear decomposition (APTLD) algorithm was used to analyze the three-way data array stacked by multiple samples. The results showed that second-order calibration algorithm could accurately extract the spectral signal of the target element even if there were serious background interference and signal overlap. The predicted recovery rates of the target elements in the food samples are 82 %–119 %. The LOD and LOQ of P, S, K, and Ca are 3, 3, 20, 8 ppm and 9, 11, 68, 26 ppm, which proves that this method can accurately quantify light elements in food samples. This study demonstrated that p-XRF combined with second-order calibration is an effective method for the determination of light elements in food and has broad practical application prospects.
研究领域:
食品科学
·
分析化学
✓ 已验证
产品关联
DOI
高影响因子
MEASUREMENT
·
2025
·
IF 5.6
Yongsheng Zhang,Jian Yuan,Tao Xu,Yang Wang,Xiaonan Chen,Hua Yao,Wanxue Li,Lei Dong,Weiguang Ma,Lei Zhang,Wangbao Yin,Suotang Jia
Understanding the elemental composition of polymetallic minerals, particularly strategic metals, is essential for optimizing the development and utilization of critical mineral resources. This study introduces a rapid, cost-effective analytical method for the determination of strategic metals in polymetallic minerals using an in-house developed total reflection X-ray fluorescence (TXRF) system. This system is equipped with an Rh X-ray tube, a four-knife slit, a silicon drift detector, and Python-based spectral processing software, achieving detection limits ranging from 104.94-4.22 mg kg −1 for elements with atomic number (Z) from 11 to 38 and 86. Solid samples were prepared as suspensions by mixing 10 mg of powder in 1 mL of ethylene glycol, and Ga as internal standard was added. The quantitative analysis accuracy of the system was validated using cobalt-rich nodule standard reference material. Its application to real-world copper-nickel sulfide ores exhibited a strong linear correlation with inductively coupled plasma atomic emission spectroscopy (R 2 = 0.9929) and yielded results comparable to those obtained with a commercial Mo-TXRF spectrometer (R 2 = 0.9919). These findings were demonstrated the suitability of the in-house developed TXRF system for the analysis of polymetallic minerals, and provide a valuable reference for its application.
研究领域:
矿物学
·
分析化学
✓ 已验证
产品关联
DOI
高影响因子
BIOLOGICAL TRACE ELEMENT RESEARCH
·
2023
·
IF 3.9
Wu Shihao,Zhao Peng,Wang Aihua,Dong Linpei,Wu Xiaojun,Wang Jifen,Zhang Yunfeng
Monochromatic excitation X-ray fluorescence (ME-XRF) spectrometry is a novel technique for trace element analysis, characterized by its simplicity, rapidity, and low cost. The objective of this study was to evaluate the applicability of ME-XRF technique for the measurement of thallium in biological samples. Acute and subacute thallium poisoning experiments were conducted to simulate various scenarios, with blood, urine, and 10 distinct organs collected. Detection was initially performed using ME-XRF technique, followed by validation with inductively coupled plasma mass spectrometry (ICP-MS). Excellent agreement between ME-XRF and ICP-MS values was demonstrated by means of paired sample t-tests and intraclass correlation coefficients. Subsequently, the practical implementation of the proposed technique was demonstrated through an actual case study. In conclusion, this study validates ME-XRF as a suitable alternative to ICP-MS for the measurement of trace heavy metals in biological samples. These efforts promote the development of simpler and faster techniques for heavy metal detection, thereby presenting novel avenues for the prevention and diagnosis of heavy metal poisoning.
研究领域:
分析化学
·
毒理学
·
医学检验
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Minerals
·
2023
·Vol. 13
·期 3
·387
·
IF 2.5
Min Zhang,Fangfang Chen,Guoying Yan,Hongjing Li,Jing Li,Guan Peng,Hongdong Yu
The characteristics of Baiyun Obo niobium-bearing minerals are complex physicochemical properties that make the beneficiation of niobium minerals extremely difficult. In this paper, X-ray diffraction, X-ray fluorescence and mineral liberation analyzer (MLA) systems were used to study the niobium occurrence state and distribution of niobium-bearing minerals in the samples from Baiyun Obo. The results show that the chemical and mineral compositions of the sample are complex, with a Nb2O5grading of 0.24%. There are many kinds of niobium minerals, including ilmenorutile, nioboaeschynite-Nd, baotite, latrappite, euxenite-Y, fergusonite and columbite-Mn, and the highest mass fraction of 0.55% is achieved with Nb in nioboaeschynite-Nd, followed by the mass fraction of ilmenorutile (0.33%). All of the niobium-containing minerals demonstrate a low degree of dissociation. Flotation experiments explored the optimal flotation conditions for HOBA (1-hydroxyoctyl-1,1-bisphosphonic acid) as a flotation collector for Baiyun Obo niobium minerals, which is able to increase the grade of Nb2O5in the concentrate to 1.31%. The optimal use conditions of the reagent are pH 3.5–4.5, and the amount of the collector is 1000 g/t. By further optimizing the beneficiation process and reagent system, ilmenorutile and nioboaeschynite-Nd were significantly enriched in the concentrate, which suggested that HOBA can efficiently increase the grade of Nb2O5in the concentrate.Keywords:MLA;distribution regularity;flotation;niobium;Baiyun Obo
研究领域:
矿物加工
·
地球化学
·
材料科学
✓ 已验证
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2018
·
IF 8.097
Zha Li,Qingsong Hu,Zhifang Tan,Ying Yang,Meiying Leng,Xiuli Liu,Cong Ge,Guangda Niu,Jiang Tang
Lead halide perovskite nanocrystals (NCs) have attracted intense attention because of their excellent optoelectronic properties. The ionic nature of halide perovskites makes them highly vulnerable to water. Encapsulation of perovskite NCs with inorganic or organic materials has been reported to enhance their stability; however, they often suffer from large aggregation size, low water solubility, and difficulty for further surface functionalization. Here, we report a facile aqueous process to synthesize water-soluble CsPbBr3/Cs4PbBr6 NCs with the assistance of a fluorocarbon agent (FCA), which features a novel mechanism of the perovskite crystallization at the oil/water interface and direct perovskite NCs/FCA self-assembly in an aqueous environment. The products exhibit a high absolute photoluminescence quantum yield (PLQY) of ∼80% in water with the PL lasting for weeks. Through successive ionic layer adsorption and reaction, BaSO4 was further applied to encapsulate the NCs, which greatly enhanced their stability in phosphate-buffered saline solutions. The high stability in water and saline solution, high PLQY, and tunable emission wavelength, together with the successful demonstration of brain tissue labeling and PL under X-ray excitation, make our perovskite NCs a promising choice for X-ray fluorescent biolabels.
研究领域:
材料科学
·
生物医学工程
·
光学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF ANALYTICAL ATOMIC SPECTROMETRY
·
2023
·Vol. 38
·期 10
·2127-2133
·
IF 3.4
Shihao Wu,Linpei Dong,Jiahua Ji,Peng Zhao,Ge Song,Xiaojun Wu,Jifen Wang,Yunfeng Zhang,Jingjing Wang
Monochromatic excitation X-ray fluorescence (ME-XRF) spectrometry is an emerging technique for elemental analysis with many potential forensic applications. In this study, a method for rapid and efficient quantification of As, Hg, Tl, and Pb in biological tissues using ME-XRF was established and applied to actual cases. The instrument's operating conditions were optimized, and the optimum method for sample preparation was determined. According to the calibration curves of each element, a new model for the detection of biological tissues was developed based on the fundamental parameter (FP) method. The LOD values of As, Hg, Tl, and Pb were 0.04, 0.04, 0.06, and 0.07 μg g−1, respectively. Through systematic evaluation and validation, the feasibility of using ME-XRF in forensic toxicology analysis was confirmed.
研究领域:
分析化学
·
法医学
·
毒理学
✓ 已验证
产品关联
DOI
高影响因子
INORGANIC CHEMISTRY
·
2022
·
IF 5.436
Yixiong Deng,Jiayu Zhou,Gen Li,Honghai Liu,Xionghou Gao,Yuanyuan Yue,Haiyan Li,Fangming Xie,Hongtao Liu
SBA-15 has recently emerged as a potential material for the catalytic conversion of large molecules. Usually, SBA-15 has a low content of aluminum due to the conventional acidic synthesis medium. Although a few approaches have been adopted to prepare Al–SBA-15 with a high alumina content, it is still challenging to prepare well-ordered Al–SBA-15 with a high alumina content. Here, we demonstrate a facile synthesis process in neutral mediums for the grafting of Al into the framework of SBA-15. This approach relies mainly on the dissociation of Si–O–Si bonds and the polymerization of Si–O–Si/Al bonds promoted by sodium persulfate (SPS) in neutral mediums. In this way, well-ordered Al–SBA-15 with a high aluminum content and enhanced acidity was obtained. Results of X-ray fluorescence spectroscopy (XRF) showed an n(SiO2)/n(Al2O3) ratio of 13.7, much lower than that of the conventional sample (21.7) obtained in acidic medium. The characterization results indicated the presence of a well-ordered Al-containing mesophase with high hydrothermal stability. Notably, the Al content and the acidity of Al–SBA-15 can be tuned by changing the SPS amount.
研究领域:
材料科学
·
化学工程
·
催化
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）