Spectroscopy最新文献_第2页

Data Transforms in Chemometric Calibrations: Variation in MLR, Part 3: Reducing Sensitivity to Repack Σbi = 0 化学计量校准中的数据转换:MLR的变化，第3部分:降低对重新包装的敏感性Σbi = 0

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Spectroscopy Pub Date : 2023-10-01 DOI: 10.56530/spectroscopy.jm1087r1

Howard Mark, Jerome Workman

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EDX and LIBS Studies on Gallstones Using Partial Least Squares Discriminant Analysis (PLS-DA) 基于偏最小二乘判别分析(PLS-DA)的胆结石EDX和LIBS研究

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Spectroscopy Pub Date : 2023-10-01 DOI: 10.56530/spectroscopy.bc4576b9

Varun Bali, Yugal Khajuria, Neha Sharma, Sandeep Kumar, Yonghoon Lee, Pradeep K. Rai, Vivek K. Singh

{"title":"EDX and LIBS Studies on Gallstones Using Partial Least Squares Discriminant Analysis (PLS-DA)","authors":"Varun Bali, Yugal Khajuria, Neha Sharma, Sandeep Kumar, Yonghoon Lee, Pradeep K. Rai, Vivek K. Singh","doi":"10.56530/spectroscopy.bc4576b9","DOIUrl":"https://doi.org/10.56530/spectroscopy.bc4576b9","url":null,"abstract":"Gallstone formation inside the gallbladder is a serious disease and causes health problems. To create preventative measures, it is crucial to examine the composition of gallstones and identify the minerals that are responsible for their pathogenesis. In the present work, we have employed laser-induced breakdown spectroscopy (LIBS)-based elemental studies in combination with partial least squares discriminative analyses (PLS-DA). Energy dispersive X-ray spectroscopy (EDX) was also applied to quantify the elements in the different parts (core and surface) of the gallstones. Fourier transform infrared (FT-IR) spectroscopy was used to classify the gallstone samples. Spectral studies using the LIBS and EDX techniques revealed the presence of trace and toxic elements in the center part of gallstones in higher amounts than that from surface parts. The EDX study also revealed that the elemental distribution is quite heterogenous, and their distribution is random. The EDX method revealed that the center (core) part of the stone samples contained the presence of numerous heavy and toxic elements such as arsenic (As), cadmium (Cd), mercury (Hg), lead (Pb), and nickel (Ni).","PeriodicalId":21957,"journal":{"name":"Spectroscopy","volume":"17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134935137","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

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ICP-OES as a Viable Alternative to ICP-MS for Trace Analysis: Meeting the Detection Limits Challenge ICP-OES可替代ICP-MS用于痕量分析:满足检测限的挑战

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Spectroscopy Pub Date : 2023-10-01 DOI: 10.56530/spectroscopy.do3475y9

Sergei Leikin, Autumn Phillips

{"title":"ICP-OES as a Viable Alternative to ICP-MS for Trace Analysis: Meeting the Detection Limits Challenge","authors":"Sergei Leikin, Autumn Phillips","doi":"10.56530/spectroscopy.do3475y9","DOIUrl":"https://doi.org/10.56530/spectroscopy.do3475y9","url":null,"abstract":"This month’s column focuses on the applicability of inductively coupled plasma–optical emission spectroscopy (ICP-OES) fitted with a high efficiency nebulizer as a real-world alternative to ICP–mass spectrometry (ICP-MS) for certain applications. It is well-recognized that ICP-MS is the most widely used and recommended technique for ultra trace element analysis because it offers extremely high sensitivity. However, if the necessary sensitivity is achieved, an ICP-OES instrument can be a viable option because it is simpler to operate and less costly to maintain than an ICP-MS instrument. In this study, the sensitivity of ICP-OES was significantly enhanced by using a highly efficient yet robust sample introduction system. The increased efficiency was accomplished by employing an external impact surface positioned close to the nebulizer gas orifice at an optimized angle. The robustness by a non-concentric design was achieved by separating the gas and sample channels throughout the entire body of the nebulizer. The results of applying this approach to the ICP-OES analysis of a select group of sample matrices and meeting the required challenging detection limits are demonstrated.","PeriodicalId":21957,"journal":{"name":"Spectroscopy","volume":"146 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134935141","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

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Overcoming the Matrix Effect in the Elemental Analysis of Steel: An Interview with 2023 Meggers Award Winner Johannes Pedarnig 克服钢元素分析中的基体效应:专访2023年Meggers奖得主Johannes Pedarnig

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Spectroscopy Pub Date : 2023-10-01 DOI: 10.56530/spectroscopy.yd8979k2

John Chasse

引用次数: 1

Key Steps in the Workflow to Analyze Raman Spectra 关键步骤在工作流程中分析拉曼光谱

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Spectroscopy Pub Date : 2023-10-01 DOI: 10.56530/spectroscopy.fl6984w5

Shuxia Guo, Jürgen Popp, Thomas Bocklitz

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Review and Prospect: Applications of Exponential Signals with Machine Learning in Nuclear Magnetic Resonance 回顾与展望:指数信号与机器学习在核磁共振中的应用

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Spectroscopy Pub Date : 2023-09-01 DOI: 10.56530/spectroscopy.yx1073b8

Di Guo, Xianjing Chen, Mengli Lu, Wangfeng He, Sihui Luo, Yanqin Lin, Yuqing Huang, Lizhi Xiao, Xiaobo Qu

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Guess Who’s Coming to Inspect R&D? 猜猜谁要来视察研发部门了?

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Spectroscopy Pub Date : 2023-09-01 DOI: 10.56530/spectroscopy.cv2490n6

R.D. McDowall

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Study of Heavy Metals and Methyl-Mercury in Fungi in Markets of Madrid 马德里市场真菌中重金属和甲基汞的研究

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Spectroscopy Pub Date : 2023-09-01 DOI: 10.56530/spectroscopy.zf9975m6

Javier Peinador Asensio

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Detection of Acute Kidney Injury Induced by Gentamicin in a Rat Model by Aluminum-Foil-Assisted ATR-FT-IR Spectroscopy 铝箔辅助ATR-FT-IR光谱检测庆大霉素致大鼠急性肾损伤模型

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Spectroscopy Pub Date : 2023-09-01 DOI: 10.56530/spectroscopy.ii4190k9

Lujuan Yang, Haoran Fan, Peng Shang, Ying Sun, Wenli Tian, Gang Ma

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GC-ICP-MS for Process and Quality Control in Semiconductor Manufacturing GC-ICP-MS用于半导体制造过程和质量控制

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Spectroscopy Pub Date : 2023-09-01 DOI: 10.56530/spectroscopy.cm8586x8

William M. Geiger, Ed McCurdy, Mark Kelinske

{"title":"GC-ICP-MS for Process and Quality Control in Semiconductor Manufacturing","authors":"William M. Geiger, Ed McCurdy, Mark Kelinske","doi":"10.56530/spectroscopy.cm8586x8","DOIUrl":"https://doi.org/10.56530/spectroscopy.cm8586x8","url":null,"abstract":"Gas chromatography (GC) coupled to inductively coupled plasma–mass spectrometry (ICP-MS) is a powerful and flexible analytical solution that is well-established for measuring organometallic compounds such as organotin, organomercury, and organolead in environmental samples, foodstuffs, and consumer products. GC–ICP-MS is also used for industrial applications, such as monitoring catalyst poisons and environmental contaminant elements in petrochemical processing and plastics manufacturing. The semiconductor industry uses a range of high-purity specialty gases and volatile liquids as precursors in wafer substrate production, and for processes such as plasma etching and deposition of thin films by chemical vapor deposition (CVD). Semiconductor manufacturers are constantly developing new integrated circuit (IC) chips with smaller sizes, higher speeds, lower power consumptions, and greater transistor densities. This trend means that contaminants must be controlled at even lower levels in process chemicals and precursors. In this article, we show how GC–ICP-MS, particularly using triple quadrupole or tandem ICP-MS (ICP-MS/MS), enables determination of the lowest levels of contaminants in the specialty gases and volatile liquids used to make the most advanced electronic devices.","PeriodicalId":21957,"journal":{"name":"Spectroscopy","volume":"60 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135394248","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0