In our June Issue:
COLUMNS
Molecular Spectroscopy Workbench
Measurement of the Temperature Dependence of Water Using a Near-Infrared
Raman Spectrograph
Fran Adar
The spectral behavior of water is studied using Raman with an NIR spectrograph and dual wavelength lasers for measurements of both the fingerprint and the OH stretching regions. Raman spectra are recorded between 5 °C and 80 °C, and treated with both band-fitting and the 2D-COS algorithm revealing improved insights into the spectral behavior of water.
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Chemometrics in Spectroscopy
More About CLS, Part 1: Expanding the Concept
Howard Mark and Jerome Workman, Jr.
A newly discovered effect can introduce large errors in many multivariate spectroscopic calibration results. The CLS algorithm can be used to explain this effect. Having found this new effect that can introduce large errors in calibration results, an investigation of the effects of this phenomenon to calibrations using principal component regression (PCR) and partial least squares (PLS) is examined.
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How to Take the Next Step in Correlative Raman Imaging of Polymers and Microplastics
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Feature Article
Use of Handheld X-Ray Fluorescence to Analyze Platinum Group Metals
in Catalytic Converters
Karen Paklin
The platinum-group metals platinum, palladium, and rhodium are essential and valuable elements in catalytic converters, and thus must be recycled. Handheld X-ray fluorescence (XRF) can be extremely beneficial for analysis of these metals in finely ground materials extracted from used catalytic converters.
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Peer-Reviewed Article
The Importance of Fourier-Transform Infrared Spectroscopy in the Identification of Carbonate Phases Differentiated in Magnesium Content
Katarzyna J. Stanienda-Pilecki
In this study, FT-IR spectroscopy was used for identification of carbonate minerals in limestone with variable contents of magnesium. Associated spectral bands were identified and assigned. Results of studies of Triassic limestone samples taken from the area of the Polish part of the Germanic Basin using FT-IR are presented. The results of research show that substitution of Ca2+ by Mg2+ in the carbonate phase lattices leads to a continuous wavenumber increase in the assigned band locations.
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Raman Technology for Today's Spectroscopists
Articles
Criteria for High-Quality Raman Microscopy
Damon Strom, Sonja Breuninger, Harald Fischer, Andrea Richter, Ute Schmidt, and Olaf Hollricher
Five key qualitative factors–speed, sensitivity, resolution, modularity and upgradeability, and combinability–contribute to the quality of confocal Raman imaging microscopes. Using application examples, this article introduces modern Raman imaging and correlative imaging techniques, and presents state–of–the–art practice examples from polymer research, pharmaceutics, low-dimensional materials research, and life sciences.
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Rapid, Portable Pathogen Detection with Multiplexed SERS-based Nanosensors
Hayleigh Kearns, Lauren E. Jamieson, Duncan Graham, Karen Faulds and Cicely Rathmell
A new application of surface-enhanced Raman spectroscopy (SERS) is described for quantifying low concentrations of pathogens with high reproducibility. In this novel assay, bacteria are captured and isolated using functionalized metal nanoparticles for rapid optical identification via SERS. Initial tests with a portable SERS system validated the ability to identify the presence of Escherichia coli and methicillin-resistant Staphylococcus aureus bacteria.
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Characterizing Microplastic Fibers Using Raman Spectroscopy
Bridget O'Donnell and Eunah Lee
In this study, macro- and microscopic Raman spectroscopy were used to identify different commercial microplastic fibers using measured spectra with database searches. Raman microscopy is demonstrated as a powerful technique for microplastic fiber characterization, especially for samples that contain mixtures of components, including multiple polymers, or additives.
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High-Throughput, Sensitivity, and Robustness: Optimizing ICP–MS Performance for Challenging Applications
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Overcoming Common Challenges in Waste and Surface Waters Analysis
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How ICP–MS/MS Improves Data Quality in Everyday Analytical Challenges and for Emerging Contaminants
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Gaining Operational Efficiencies in Drinking Water Analysis
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Impurities: Compliance Requirements and USP Resources
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What's the BIG DEAL about Nanoparticles in Water: spICP-MS for Identification and Occurrence in Water Treatment Plants
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Ensuring Integrity of Drug Formulation from Development to QC
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ICP-OES Technology Advancements Addresses the Axial/Radial Dilemma on Plasma Viewing While Offering Improvements in Overall Performance
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Discover the Latest Advances in ICP-OES and ICP-MS Techniques
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Re–think Quantitative Analysis: Solutions for Challenging Measurements
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Analyzing Mercury in the Peruvian Amazon: Assessing the Impact of Illegal Artisanal Gold Mining
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The Role of Raman Spectroscopy in the QA/QC Laboratory
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