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detection and quantification of Pb and Cr in oysters using laser-induced breakdown spectroscopy

Plasma Science and Technology 2023年第4期25卷 195-203页

作者：闫清霞田野李颖林洪贾自文卢渊俞进孙琛白雪石 Vincent DETALLE College of Physics and Optoelectronic Engineering Ocean University of ChinaQingdao 266100People’s Republic of China Food Safety Laboratory Ocean University of ChinaQingdao 266003People’s Republic of China School of Physics and Astronomy Shanghai Jiao Tong UniversityShanghai 200240People’s Republic of China Centre de Recherche et de Restauration des Musées de France(C2RMF) Paris 75001France SATIE CY Cergy-Paris UniversitéENS Paris-SaclayCNRS UMR 8029Neuville sur Oise 95031France

The quantitative determination of heavy metals in aquatic products is of great importance for food security ***-induced breakdown spectroscopy(LIBS)has been used in a variety of foodstuff analysis,but is still limited by its low sensitivity when targeting trace heavy *** this work,we compare three sample enrichment methods,namely drying,carbonization,and ashing,for increasing detection sensitivity by LIBS analysis for Pb and Cr in oyster *** results demonstrate that carbonization can remove a significant amount of the contributions of organic elements C,H,N and O;meanwhile,the signals of the metallic elements such as Cu,Pb,Sr,Ca,Cr and Mg are enhanced by3–6 times after carbonization,and further enhanced by 5–9 times after *** enhancement is not only due to the more concentrated metallic elements in the sample compared to the dried ones,but also the unifying of the matter in carbonized and ashed samples from which higher plasma temperature and electron density are *** condition favors the detection of trace *** to the calibration curves with univariate and multivariate analysis,the ashing method is considered to be the best *** limits of detection of the ashing method are 0.52 mg kg-1 for Pb and0.08 mg kg-1 for Cr,which can detect the presence of heavy metals in the oysters exceeding the maximum limits of Pb and Cr required by the Chinese national *** method provides a promising application for the heavy metal contamination monitoring in the aquatic product industry.

关键词： laser-induced breakdown spectroscopy(LIBS) heavy metal detection signal enhancement sample preparation method quantification oysters

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Fluorogenic detection of mercury ion in aqueous environment using hydrogel-based AIE sensing films

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Aggregate 2023年第3期4卷 94-101页

作者： Shujun Wu Yujiao Yang Yao Cheng Shuodong Wang Zhibiao Zhou Pei Zhang Xinqi Zhu Baodui Wang Hua Zhang Sheng Xie Zebing Zeng Ben Zhong Tang Shenzhen Research Institute of Hunan University Nanshan DistrictShenzhenState Key Laboratory of Chemo/Biosensing and ChemometricsCollege of Chemistry and Chemical EngineeringHunan UniversityChangshaChina Shanghai Institute of Optics and Fine Mechanics Chinese Academy of SciencesShanghaiChina University of Chinese Academy of Sciences BeijingChina State Key Laboratory of Applied Organic Chemistry and Key Laboratory of Nonferrous metal Chemistry and Resources Utilization of Gansu Province Lanzhou UniversityGansuChina State Key Laboratory of Environmental Geochemistry Institute of GeochemistryChinese Academy of SciencesGuiyangChina AIE Institute Guangzhou Development DistrictHuangpuChina School of Science and Engineering Shenzhen Key Laboratory of Functional Aggregate MaterialsThe Chinese University of Hong KongShenzhenChina

A“turn-on”fluorescent sensing strategy was developed for ultrasensitive detection of heavy metal mercury ion(Hg2+)directly in *** utilized an aqueous soluble aggregation-induced emission(AIE)-active probe,named 1,1,2,2-tetrakis(4-(1Htetrazol-5-yl)phenyl)ethene(TPE-4TA),composing of a luminescent tetraphenylene core and multiple anionic tetrazolate *** probe retained dark when molecularly dissolved in ***,mercury ions can ligate with multiple tetrazolate groups to form infinite coordination polymer particles spontaneously,thus inducing a fluorogenic AIE response for in situ ***,by embedding this AIE sensing molecules in a hydrophilic polyvinyl alcohol substrate,the resulting hydrogel film allowed in situ detection of Hg^(2+)on a laser-induced fluorescence analysis setup in aqueous *** strategy worked effectively in common aqueous environments with pH from 4 to 7.5 and showed high sensitivity(limit of detection down to 0.38 ppb/1.9 nM),good selectivity and a wide linearity range for *** work may lead to a reliable and promising platform for on-site environmental water analysis.

关键词： aggregation-induced emission heavy metal detection hydrogel

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