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学者姓名：李小晶
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Rationale: In recent years, ephedrine psychoactive substances have attracted much attention due to their prevalence in water bodies and potential threat to aquatic ecosystems. Psychoactive substances have been considered as a new type of environmental pollutant due to their unpredictable potential risks to the behavior and nervous system of non-target organisms. A rapid, sensitive, selective, and robust method for the quantification of three ephedrine psychoactive substances in sewage is needed. Methods: An ultraperformance liquid chromatography-tandem mass spectrometry (UPLC-MS/MS) method was developed for the simultaneous determination of three ephedrine psychoactive substances in water. The optimal processing conditions were determined by optimizing the chromatography—mass spectrometry and solid-phase extraction (SPE) conditions (e.g., the SPE column, sample pH, washing, and elution), and the treatment conditions were determined; this was achieved via positive ion scanning in multiple reaction monitoring mode. Poly-Sery MCX was selected as the extraction column, with samples loaded at pH 3. And 4-mL solution of 2% formic acid (FA) aqueous solution was used as the eluent; the target compounds were eluted with 5 mL of 5% NH4OH in acetonitrile (ACN) solution. The best results were obtained when the residue was resolubulization in ACN after nitrogen evaporation. Results: The developed UPLC-MS/MS showed a good linear relationship in the range of 0–50.00 μg/L, with determination coefficients (R2) greater than 0.9990. The detection limit and quantitation limit were 0.05–0.10 and 0.20–0.50 μg/L, respectively. Recovery rates of the target compounds in blank sewage at three different concentrations ranged from 92.37% to 106.31%, with relative standard deviations (RSDs) of 0.77%–4.83% (n = 7). Conclusions: This method has been successfully applied to the analysis of surface water and domestic sewage, and the samples were processed stably, indicating that the method is practical for the determination of ephedrine psychoactive drugs in water bodies. © 2024 John Wiley & Sons Ltd.
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| GB/T 7714 | Xu, Y. , Yang, F. , Ye, H. et al. Determination of three ephedrine psychoactive substances in sewage using solid-phase extraction–ultra-performance liquid chromatography–tandem mass spectrometry [J]. | Rapid Communications in Mass Spectrometry , 2024 , 38 (20) . |
| MLA | Xu, Y. et al. "Determination of three ephedrine psychoactive substances in sewage using solid-phase extraction–ultra-performance liquid chromatography–tandem mass spectrometry" . | Rapid Communications in Mass Spectrometry 38 . 20 (2024) . |
| APA | Xu, Y. , Yang, F. , Ye, H. , Tang, Q. , Chen, Y. , Gao, Z. et al. Determination of three ephedrine psychoactive substances in sewage using solid-phase extraction–ultra-performance liquid chromatography–tandem mass spectrometry . | Rapid Communications in Mass Spectrometry , 2024 , 38 (20) . |
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The study synthesized nitrogen-doped cobalt oxide precursors using a one-pot hydrothermal method. Three catalysts, N&CoO-Ar, N&CoO-N, and N&CoO-NH, were obtained by calcination under different atmospheric environments (argon, nitrogen, and nitrogen-hydrogen mixture). Characterization results showed that all the prepared materials consisted primarily of carbon components and cobalt oxide, while the catalysts calcined in a nitrogen-hydrogen atmosphere owned the highest content of pyridine nitrogen. Degradation experiments on sulfapyridine (SPD) showed that the N&CoO-NH/PMS system exhibited the best SPD degradation performance (the apparent rate constants were 3.0, 5.1 and 8.3 times larger those of N&CoO-N/PMS, N&CoO-Ar/PMS, and pure CoO/PMS), and was able to rapidly degrade the pollutant within 5 min. The quenching experiments and electrochemical experiments indicated that the nitrogen component modulation improved the chemisorption between PMS and N&CoO-NH and enhanced the electron transfer efficiency between N&CoO-NH/PMS and the pollutant. In addition, the N&CoO-NH/PMS system exhibited good stability and a wide pH applicability. Furthermore, N&CoO-NH/PMS also exhibited good anti-interference performance in the presence of Cl-, HCO3-, NO3-, PO42-, CO32-, and HA, as well as excellent feasibility of treating actual wastewater.
Keyword ：
Cobalt-based catalysts Cobalt-based catalysts Degradation of organic pollutants Degradation of organic pollutants DFT DFT N doping N doping Permonosulfate activation Permonosulfate activation
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| GB/T 7714 | Zou, Lingxiao , Yang, Kai , Hu, Yihui et al. Nitrogen-doped cobalt oxide via atmospheric modulation activates PMS for rapid degradation of organic pollutants: Role of nitrogen fraction on sulfapyridine elimination [J]. | JOURNAL OF WATER PROCESS ENGINEERING , 2024 , 67 . |
| MLA | Zou, Lingxiao et al. "Nitrogen-doped cobalt oxide via atmospheric modulation activates PMS for rapid degradation of organic pollutants: Role of nitrogen fraction on sulfapyridine elimination" . | JOURNAL OF WATER PROCESS ENGINEERING 67 (2024) . |
| APA | Zou, Lingxiao , Yang, Kai , Hu, Yihui , Guo, Xingyu , Li, Xiaojing , Lv, Yuancai et al. Nitrogen-doped cobalt oxide via atmospheric modulation activates PMS for rapid degradation of organic pollutants: Role of nitrogen fraction on sulfapyridine elimination . | JOURNAL OF WATER PROCESS ENGINEERING , 2024 , 67 . |
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Abstract ：
RationaleIn recent years, ephedrine psychoactive substances have attracted much attention due to their prevalence in water bodies and potential threat to aquatic ecosystems. Psychoactive substances have been considered as a new type of environmental pollutant due to their unpredictable potential risks to the behavior and nervous system of non-target organisms. A rapid, sensitive, selective, and robust method for the quantification of three ephedrine psychoactive substances in sewage is needed.MethodsAn ultraperformance liquid chromatography-tandem mass spectrometry (UPLC-MS/MS) method was developed for the simultaneous determination of three ephedrine psychoactive substances in water. The optimal processing conditions were determined by optimizing the chromatography-mass spectrometry and solid-phase extraction (SPE) conditions (e.g., the SPE column, sample pH, washing, and elution), and the treatment conditions were determined; this was achieved via positive ion scanning in multiple reaction monitoring mode. Poly-Sery MCX was selected as the extraction column, with samples loaded at pH 3. And 4-mL solution of 2% formic acid (FA) aqueous solution was used as the eluent; the target compounds were eluted with 5 mL of 5% NH4OH in acetonitrile (ACN) solution. The best results were obtained when the residue was resolubulization in ACN after nitrogen evaporation.ResultsThe developed UPLC-MS/MS showed a good linear relationship in the range of 0-50.00 mu g/L, with determination coefficients (R2) greater than 0.9990. The detection limit and quantitation limit were 0.05-0.10 and 0.20-0.50 mu g/L, respectively. Recovery rates of the target compounds in blank sewage at three different concentrations ranged from 92.37% to 106.31%, with relative standard deviations (RSDs) of 0.77%-4.83% (n = 7).ConclusionsThis method has been successfully applied to the analysis of surface water and domestic sewage, and the samples were processed stably, indicating that the method is practical for the determination of ephedrine psychoactive drugs in water bodies.
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| GB/T 7714 | Xu, Yiqin , Yang, Fang , Ye, Hong et al. Determination of three ephedrine psychoactive substances in sewage using solid-phase extraction-ultra-performance liquid chromatography-tandem mass spectrometry [J]. | RAPID COMMUNICATIONS IN MASS SPECTROMETRY , 2024 , 38 (20) . |
| MLA | Xu, Yiqin et al. "Determination of three ephedrine psychoactive substances in sewage using solid-phase extraction-ultra-performance liquid chromatography-tandem mass spectrometry" . | RAPID COMMUNICATIONS IN MASS SPECTROMETRY 38 . 20 (2024) . |
| APA | Xu, Yiqin , Yang, Fang , Ye, Hong , Tang, Qingqiang , Chen, Yanwen , Gao, Zhigang et al. Determination of three ephedrine psychoactive substances in sewage using solid-phase extraction-ultra-performance liquid chromatography-tandem mass spectrometry . | RAPID COMMUNICATIONS IN MASS SPECTROMETRY , 2024 , 38 (20) . |
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A new procedure that utilizing a preconcentration system based on magnetism-enhanced in-tube solid phase microextraction (ME/IT-SPME) and detection by HPLC with diode array detector (DAD) after liq-uid desorption from the microextraction column has been developed for the online measurement of tetraethyllead (TEL) in various aqueous samples. In this connection, according to the chemical features of TEL, porous monolith mingled with Fe3O4 nanoparticles were designed and synthesized in a silica cap-illary, and used as the microextraction column of ME/IT-SPME. To favor the implement of variable mag-netic fields during extraction procedure, the as-prepared microextraction column was twined a magnetic coil. Results revealed that the exertion of magnetic field during the adsorption and eluting procedures assisted the extraction of TEL with an enhancement by 52% in extraction efficiency. Under the most ben-eficial conditions, the developed ME/IT-SPME was online hyphenated with HPLC/DAD to measure trace TEL in various aqueous samples. The limit of detection was 0.082 mu g/L and the RSDs for precision were in the range of 6.3-8.5%. The recoveries with low, medium and high fortified levels varied from 80.6% to 95.0% with good repeatability. To the best of knowledge, this is the first study that using IT-SPME to extract TEL and then online quantification with HPLC/DAD.(c) 2023 Published by Elsevier B.V.
Keyword ：
Aqueous samples Aqueous samples HPLC HPLC Magnetism-enhanced in -tube solid phase Magnetism-enhanced in -tube solid phase microextraction microextraction Monolith Monolith Tetraethyllead Tetraethyllead
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| GB/T 7714 | Song, Xiaochong , Meng, Xin , Chen, Minshi et al. Online measurement of tetraethyllead in aqueous samples utilizing monolith-base d magnetism-enhance d in-tub e solid phase microextraction coupled with chromatographic analysis [J]. | JOURNAL OF CHROMATOGRAPHY A , 2023 , 1700 . |
| MLA | Song, Xiaochong et al. "Online measurement of tetraethyllead in aqueous samples utilizing monolith-base d magnetism-enhance d in-tub e solid phase microextraction coupled with chromatographic analysis" . | JOURNAL OF CHROMATOGRAPHY A 1700 (2023) . |
| APA | Song, Xiaochong , Meng, Xin , Chen, Minshi , Wang, Lei , Li, Xiaojing , Huang, Xiaojia . Online measurement of tetraethyllead in aqueous samples utilizing monolith-base d magnetism-enhance d in-tub e solid phase microextraction coupled with chromatographic analysis . | JOURNAL OF CHROMATOGRAPHY A , 2023 , 1700 . |
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To capture fluoroquinolones (FQs) from complex samples efficiently, a new hybrid metal-organic framework (MOF)@monolith material (HMM) was fabricated and employed as the extraction medium of multi-monolith fibers solid phase microextraction (MMF-SPME). Porous monolithic fibers based on allyltrimethylammonium chloride-co-ethylene glycol dimethacrylate/divinylbenzene polymer were fabricated firstly. After that, the strategy of layer-by-layer self-assembly was employed to prepare zeolitic imidazolate frameworks within the pores and the surface of the monolith. Various characterization results well evidenced that the introduction of MOF not only enhanced the surface area of adsorbent, but also introduced new active sites. The prepared HMM/ MMF-SPME presented satisfactory capture performance towards studied FQs by multiple interactions. Enrich-ment factors of FQs in human urine and milk samples were in the ranges of 99-128 and 85-121, respectively. Under the most beneficial fabrication and extraction parameters, HMM/MMF-SPME was combined with high-performance liquid chromatography to quantify trace FQs in urine and milk samples. High sensitivity (limits of detection were 0.0072-0.031 mu g/L for urine sample and 0.016-0.057 mu g/kg for milk sample) and good pre-cision (RSDs below 10%) were obtained. In the analysis of FQs in actual samples, the recovery at different spiked contents varied from 77.4% to 120%, with good reproducibility. Accuracy and reliability of established approach were well verified with confirmation experiments. Satisfactory results evidence that the developed HMM/MMF-SPME can be a prominent technique for the capture of trace FQs in complex samples.
Keyword ：
Adsorbent Adsorbent Fluoroquinolones Fluoroquinolones Metal-organic framework Metal-organic framework Monolith Monolith Solid phase microextraction phase Solid phase microextraction phase
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| GB/T 7714 | Chen, Hexun , Wu, Jiangyi , Xiong, Qingbiao et al. Efficient capture of fluoroquinolones in urine and milk samples with multi-monolith fibers solid phase microextraction based on hybrid metal-organic framework/monolith material [J]. | MICROCHEMICAL JOURNAL , 2023 , 189 . |
| MLA | Chen, Hexun et al. "Efficient capture of fluoroquinolones in urine and milk samples with multi-monolith fibers solid phase microextraction based on hybrid metal-organic framework/monolith material" . | MICROCHEMICAL JOURNAL 189 (2023) . |
| APA | Chen, Hexun , Wu, Jiangyi , Xiong, Qingbiao , Li, Xiaojing , Huang, Xiaojia . Efficient capture of fluoroquinolones in urine and milk samples with multi-monolith fibers solid phase microextraction based on hybrid metal-organic framework/monolith material . | MICROCHEMICAL JOURNAL , 2023 , 189 . |
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In-tube solid phase microextraction (IT-SPME) utilizing molecularly imprinted polymers (MIPs) as extraction phase has received wide attention due to various merits. However, low extraction efficiency and unsatisfactory recognition performance have limited its extensive application. To circumvent the limitations, a new strategy that implementation of magnetic fields during extraction stage was introduced to improve the extraction efficiency and recognition performance of MIPs-based IT-SPME. Firstly, using 2,4-dinitroaniline (2,4-DNA) as model template, a MIP mingled with magnetic nanoparticles (Fe3O4) was in-situ prepared in a capillary and employed as the microextraction column of IT-SPME. In the second step, a magnetic coil was wrapped the as-prepared MIPbased microextraction column so as to produce variable magnetic fields in extraction step. Results revealed that the application of magnetic field during the adsorption step improved the specific extraction performance towards template. The extraction efficiency and imprinting factor towards 2,4-DNA increased from 58% and 2.5 to 81% and 3.1, respectively. Practicality of the introduced magnetism-assisted IT-SPME technique based on MIP was demonstrated by on-line hyphenating with HPLC/DAD to quantify trace 2,4-DNA in a variety of environmental waters. High sensitivity (limit of detection was 0.060 mu g/L), good precision (RSDs were below 10%) and satisfactory recoveries (82.1-111%) were obtained. Furthermore, the possible selective extraction mechanism under magnetic fields was deduced.
Keyword ：
4-dinitroaniline 4-dinitroaniline In-tube solid phase microextraction In-tube solid phase microextraction Magnetic fiel d Magnetic fiel d Molecularly imprinted polymer Molecularly imprinted polymer Water Water
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| GB/T 7714 | Song, Xiaochong , Li, Xiaojing , Wang, Jingjuan et al. Adoption of new strategy for molecularly imprinted polymer based in-tube solid phase microextraction to improve specific recognition performance and extraction efficiency [J]. | MICROCHEMICAL JOURNAL , 2023 , 194 . |
| MLA | Song, Xiaochong et al. "Adoption of new strategy for molecularly imprinted polymer based in-tube solid phase microextraction to improve specific recognition performance and extraction efficiency" . | MICROCHEMICAL JOURNAL 194 (2023) . |
| APA | Song, Xiaochong , Li, Xiaojing , Wang, Jingjuan , Huang, Xiaojia . Adoption of new strategy for molecularly imprinted polymer based in-tube solid phase microextraction to improve specific recognition performance and extraction efficiency . | MICROCHEMICAL JOURNAL , 2023 , 194 . |
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Rationale In recent years, white tea has become increasingly popular. Some merchants confuse the age of white tea and sell poor-quality products for profit. Therefore, it is necessary to provide technical support for product authentication and valorization in white tea of different marked ages. Methods Volatile organic compounds (VOCs) were detected by proton transfer reaction time-of-flight mass spectrometry (PTR-TOF-MS) and identified as volatile fingerprints. PTR-TOF-MS combined with multivariate analysis was found to identify white tea of four different marked ages (1, 3, 5, and 8 years) for authentication. Principal component analysis (PCA) and orthogonal partial least-squares discriminant analysis (OPLS-DA) were used as classification models to identify key volatile metabolites. Results The OPLS-DA model achieved the best results (96.67%, 96.67%, 96.67%, and 96.67% in the training set and 96.00%, 96.00%, 100%, and 100% in the prediction set for 1-year, 3-year, 5-year, and 8-year tea samples, respectively), showing that PTR-TOF-MS with the OPLS-DA model could successfully be used in the identification of white tea with different marked ages. Out of the 60 identified VOCs, 26 volatile materials were closely correlated with tea age and were used as markers to discriminate white tea of different ages. Conclusions PTR-TOF-MS coupled with multivariate analysis could be applied for quality evaluation of tea products of different ages and provided a feasible technical support for product authentication and valorization in white tea of different marked ages.
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| GB/T 7714 | Wu, Weihua , Zhang, Dandan , He, Ye et al. Identification of the age of white tea using proton transfer reaction time-of-flight mass spectrometry (PTR-TOF-MS) coupled with multivariate analysis [J]. | RAPID COMMUNICATIONS IN MASS SPECTROMETRY , 2022 , 36 (3) . |
| MLA | Wu, Weihua et al. "Identification of the age of white tea using proton transfer reaction time-of-flight mass spectrometry (PTR-TOF-MS) coupled with multivariate analysis" . | RAPID COMMUNICATIONS IN MASS SPECTROMETRY 36 . 3 (2022) . |
| APA | Wu, Weihua , Zhang, Dandan , He, Ye , Cao, Jie , Li, Xiaojing . Identification of the age of white tea using proton transfer reaction time-of-flight mass spectrometry (PTR-TOF-MS) coupled with multivariate analysis . | RAPID COMMUNICATIONS IN MASS SPECTROMETRY , 2022 , 36 (3) . |
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Ingesting microplastics (MPs) from plastic tableware is an important source of health risk to human bodies. However, the comprehensive information of MPs released from disposable tableware has not been explored. Herein, a new visual quantification method for polystyrene MPs is proposed with carbon nitride fluorescent polymers staining, which can overcome the disadvantages of high signal background and photobleaching derived from organic dyes staining. Combining with fluorescence microscope and ImageJ software, the quantity, shape, and size distribution of MPs carried by the brand-new disposable polystyrene tableware (DPT) samples before usage and released from the clean DPT samples in different simulated usage scenes were studied. The brand-new DPT samples were found to carry a large number of MPs particles and the clean DPT samples could release MPs during usage. Fiber and fragment are the main morphology of the detected MPs and fiber accounts for 45-52 %. The particles with size <50 mu m are the majority of the detected MPs and the distribution fraction of MPs particles is gradually decreased with the raising of particle size within 50 mu m. The released MPs particles are increased with the raising of contact time and temperature, and greatly boosted for the DPT samples with cracks. The DPT samples are more like to release MPs in weak acidic condition (pH 4.0) than in weak alkaline (pH 8.3) and neutral (pH 7.0) conditions. The obtained results help to assess the food safety of tack-out food and the health risk of MPs exposure to human.
Keyword ：
Carbon nitride Carbon nitride Disposable tableware Disposable tableware Fluorescent imaging Fluorescent imaging Microplastics Microplastics Polystyrene Polystyrene
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| GB/T 7714 | Zheng, Xueyi , Feng, Qiaocheng , Chen, Jingru et al. Quantification analysis of microplastics released from disposable polystyrene tableware with fluorescent polymer staining [J]. | SCIENCE OF THE TOTAL ENVIRONMENT , 2022 , 864 . |
| MLA | Zheng, Xueyi et al. "Quantification analysis of microplastics released from disposable polystyrene tableware with fluorescent polymer staining" . | SCIENCE OF THE TOTAL ENVIRONMENT 864 (2022) . |
| APA | Zheng, Xueyi , Feng, Qiaocheng , Chen, Jingru , Yan, Jiaquan , Li, Xiaojing , Guo, Liangqia . Quantification analysis of microplastics released from disposable polystyrene tableware with fluorescent polymer staining . | SCIENCE OF THE TOTAL ENVIRONMENT , 2022 , 864 . |
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本发明属于橡胶试样技术领域。 本发明提供了一种2‑巯基苯并噻唑测定用标准橡胶样品的制备方法包括以下步骤：将生胶进行塑炼，得到塑炼胶； 将塑炼胶、固体软化剂和油脂混合，得到混合产物； 将所述混合产物、填料和2‑巯基苯并噻唑进行混炼，得到混炼胶； 将混炼胶与硫化剂混合，进行硫化反应，得到测定2-巯基苯并噻唑的标准胶样。 本发明制备方法得到的2‑巯基苯并噻唑测定用标准橡胶样品重现性和重复性高，日间重复性标准偏差和重现性标准偏差小。
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| GB/T 7714 | Xiong Qinbiao , Li Xiaojing . 2-巯基苯并噻唑测定用标准橡胶样品及其制备方法 : LU502280[P]. | 2022-06-15 . |
| MLA | Xiong Qinbiao et al. "2-巯基苯并噻唑测定用标准橡胶样品及其制备方法" : LU502280. | 2022-06-15 . |
| APA | Xiong Qinbiao , Li Xiaojing . 2-巯基苯并噻唑测定用标准橡胶样品及其制备方法 : LU502280. | 2022-06-15 . |
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| GB/T 7714 | Li Xiaojing , Tu Jiayi , Zhang Fang . 一种测定2-巯基苯并噻唑的标准橡胶样品及制备方法 : ZA202206511[P]. | 2022-06-13 . |
| MLA | Li Xiaojing et al. "一种测定2-巯基苯并噻唑的标准橡胶样品及制备方法" : ZA202206511. | 2022-06-13 . |
| APA | Li Xiaojing , Tu Jiayi , Zhang Fang . 一种测定2-巯基苯并噻唑的标准橡胶样品及制备方法 : ZA202206511. | 2022-06-13 . |
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