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July 2012 |
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Benefits of HPLC-ICP-MS Coupling for Mercury Speciation in Food Sébastien Sannac, Yu-Hong Chen, Raimund Wahlen, and Ed McCurdy, Agilent Technologies Demonstrates a fast and effective gradient-HPLC-ICP-MS method for the analysis of mercury species in food samples, giving complete separation of the four species of interest in less than 3 min. |
| EDXRF Application Note: Iron Oxide in Silica Sand Scott Fess, Rigaku Americas Corporation One of the major uses of silica sand is to make glass, in particular glass bottles. Iron content is one of the major factors that affect the color of the glass. The analysis of iron oxide in silica sand is demonstrated with the low cost Rigaku NEX QC EDXRF analyzer. |
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| Analysis of Lipstick for Toxic Elements Using ICP-MS Patricia Atkins, SPEX CertiPrep Studies prior to 2012, have found levels of lead up to 3 ppm in lipstick. The purpose of this study was to re-examine the potential for lead contamination in lipstick and determine if any other potentially toxic metals were present in these lipsticks. Parts per million concentrations were found of several potentially toxic elements. |
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In situ Screening of Quality Traits in Tomato Cultivars Using Handheld FT-IR Spectroscopy Glynda Fe G. Sayajon, Sarah Herringshaw, Alejandra M. Santos, Luis E. Rodriguez-Saona, and David M. Francis, Agilent Technologies Chemometrics was used to develop models that use infrared spectral measurements to estimate the concentrations of key analytes that determine quality in tomatoes. Models constructed using the handheld 4200 FlexScan FT-IR gave results comparable to those obtained using a benchtop spectrometer. |
| Determination of Low Concentration Methanol in Alcohol by an Affordable High Sensitivity Raman Instrument Duyen Nguyen and Eric Wu, Enwave Optronics, Inc. Low concentration natural methanol exists in most alcoholic beverages and usually causes no immediate health threat. Nevertheless, it is possible to have natural occurring methanol in beverages with concentration as high as 18 g/L of ethanol. |
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| UV LEDs for Measuring Intrinsic Protein Fluorescence. Ocean Optics The availability of powerful, interchangeable UV LEDs facilitates the measurement of intrinsic protein fluorescence as an indicator of protein folding state. The Ocean Optics LLS-280 model 280 nm UV LED was used with the company’s QE65 Pro scientific grade spectrometer and flexible CUV-ALLUV 4-way cuvette holder to measure intrinsic fluorescence from samples of lysozyme and bovine serum albumin (BSA) in different protein folding states. The results illustrate the power of the modular spectroscopy approach to monitor fluorescence from proteins, biomolecules, and other UV excited fluorophores. |
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| Polymorphic Transition Measured by Raman Spectroscopy B&W Tek, Inc. In this application note we discuss how Raman spectroscopy and gravimetric vapor sorption monitor moisture-induced polymorphic transition. |
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| Combined 1064 nm Raman and NIR Spectroscopy Owen Wu, Chad Lieber, Jack Qian, Lin Chandler, and Eric Bergles, BaySpec, Inc. A new compact instrument combining dispersive 1064 nm Raman and NIR spectroscopy has been developed to deliver maximized analytical flexibility and analytical power. |
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| Determination of the Degree of Cure of a Varnish Tom Tague, Bruker Optics Modern paints and varnishes are complex mixtures and the optimization of the material properties is an important task. One of the most essential variables is the curing which should in most cases take place in a reasonably short time span that can range from a fraction of a second to many days. It is difficult to evaluate the degree of the curing and its completeness by visual inspection. Therefore, an unbiased and reliable quantitative analysis is needed in quality control but also in R&D to optimize the varnish or the curing method respectively. |
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