Cloud Point Extraction of Metal Oxide Nanoparticles in Water Samples Identified by Raman Spectroscopy and Quantified by Atomic Absorption Spectroscopy
Poster Mar 28, 2014
Yanxiao Ma, Dr. Andrew F. Callender
Engineered nanoparticles have been shown to affect the growth of living organisms in freshwater such as lakes and rivers. It is important to acquire a suitable technique to identify nanoparticles and quantify them. Raman scattering offers the advantage of analyzing micro-scale nanoparticle species which is the maximum amount available in aquatic environment. In this project, cloud point extraction (CPE) with Raman spectroscopy and atomic absorption spectroscopy was applied to the analysis of titanium dioxide nanoparticles (TiO2 NPs) and zinc oxide nanoparticles (ZnO NPs) in water and environmental water samples. The non-ionic surfactant Triton X-114 was used to extract the metal oxide nanoparticles from water. The sample was centrifuged to collect the surfactant, followed by Raman spectroscopy of the surfactant phase. NPs were hydrolyzed in concentrated H2SO4, and then diluted to give samples for flame AA. Several CPE factors such as surfactant concentration, pH, incubation temperature, and incubation time were optimized. Method performance was characterized in terms of the smallest concentration of NPs detected, by the selectivity over metal ions, and by the sensitivity of Raman spectroscopy to identify small quantities of NPs in mixtures.
A New Tool for the Automated Sample Preparation of Whole Blood Samples by LC-MS using a Commercial AutosamplerPoster
Automated sample preparation reduces the costs per sample and minimizes sample handling errors. Usually expensive and highly specialized pipetting robots are used. However, most of these systems are not designed with a direct interface for LC-MS applications. In addition common pipetting systems are not optimized for smaller scale sample series. Here we present a new tool for liquid handling of whole blood samples and direct sample injection.
Assessment of Oral LISPRO Treatment in Ameliorating Amyloid and Tau Pathology in Transgenic Alzheimer’s Mice ModelPoster
Ionic co-crystals of lithium salicylate with organic proline (LISPRO) showed better safety and pharmacokinetic profile of lithium in plasma and brain of wild-type and transgenic Alzheimer mice model compared to lithium salts.READ MORE
Characterization of Heavily Contaminated Sites using NMR SpectroscopyPoster
NMR spectroscopy provides a unique analytical approach to present a more complete an unbiased understanding of the composition of NAPLs at many contaminated sites.READ MORE
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