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Performance-Based Ultra-Trace Mercury Determination in Coastal Seawater, BCR-579, EPA Method 245.7
Jeff Forsberg, Teledyne CETAC
Seawater analysis is a crucial part of environmental monitoring. However, it can present many obstacles for the analyst. It is a powerful tool used to gather information regarding the ecosystem. Contamination, interferences, and sample preparation are a few of the major obstacles that can arise when monitoring mercury at this level. Mercury is prevalent through point source contamination that often comes from industry and bio-accumulation. The purpose of this application note is to validate the capabilities of the CETAC QuickTrace™ M-7600 Cold Vapor Atomic Absorbance Analyzer in the ultra-trace ng/L range.
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Analysis of Low Concentration Sulfur in Petroleum-Based Fuels by Benchtop WDXRF According to ASTM D2622-10
Laura Oelofse, Rigaku
Sulfur in petroleum-based fuels contributes to atmospheric pollution and is strictly controlled. Regulations of sulfur content in fuel oil, such as diesel fuel and gasoline, have been tightened. Control of sulfur content is therefore very important in refineries. This application note demonstrates quantitative analysis of low concentration sulfur in diesel fuel, gasoline, and kerosene according to ASTM D2622-10 on Rigaku Supermini200, a benchtop wavelength-dispersive X-ray fluorescence (WDXRF) spectrometer.
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Reverse Engineering of Multilayer Films Using Nanoscale IR Spectroscopy
Tom Eby, Usha Gundusharma, Michael Lo, Khoren Sahagian, Curt Marcott, and Kevin Kjoller, Anasys Instruments
The identification of unknown multilayer samples is an important industrial application of IR microscopy. However, as the layer thicknesses become smaller than 10 µm, then the spatial resolution of IR microscopy is insufficient to unambiguously identify the layers. We introduce a new technique of nanoscale IR spectroscopy where an AFM probe tip is used as an IR absorption detector for competitive deformulation of thin multi-layer films.
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Reaction Monitoring with the QE Pro Spectrometer: Chemical Stoplight Reaction
Yvette Mattley, PhD, Ocean Optics
The chemical stoplight reaction is a reversible oxidation reduction reaction featuring the redox indicator dye indigo carmine. In this application note, we describe the use of the QE Pro spectrometer for measuring the change in absorbance during the chemical stoplight reaction. Enhanced spectrometer features including onboard buffering for data integrity are described.
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On-line NMR Reaction Monitoring — A Powerful Analytical System for the Lab Bench
Magritek
We describe how a new high-resolution benchtop NMR spectrometer can be used directly in the fume hood of a chemistry lab to monitor the progress of chemical reactions on-line. Reactants can be pumped through the spectrometer in continuous mode from the reactor to the magnet and back using standard PTFE tubing. The method is illustrated by the examples of the acetalization of acetaldehyde and the reduction of acetophenone to 1-phenylethanol.
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Maple Syrup Color Analysis Using UV-vis Spectrophotometry
Shimadzu
One of the most common applications for QA/QC environments is color analysis and being able to assign a color value to finished products. This application note illustrates the use of color analysis software and a UV-vis spectrophotometer with a large photometric range for quick and easy spectral acquisition, and interpretation into a meaningful color value.
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