6 results match your criteria Atomic Spectroscopy[Journal]

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Portable X-ray fluorescence spectroscopy as a rapid screening technique for analysis of TiO and ZnO in sunscreens.

Spectrochim Acta Part B At Spectrosc 2016 Feb;116:21-27

Office of Regulatory Affairs, Arkansas Regional Laboratory, U.S. Food and Drug Administration, 3900 NCTR Road, Jefferson, AR 72079, United States.

This investigation reports a rapid and simple screening technique for the quantification of titanium and zinc in commercial sunscreens using portable X-ray fluorescence spectroscopy (pXRF). A highly evolved technique, inductively coupled plasma-mass spectroscopy (ICP-MS) was chosen as a comparative technique to pXRF, and a good correlation (r > 0.995) with acceptable variations (≤25%) in results between both techniques was observed. Read More

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http://dx.doi.org/10.1016/j.sab.2015.11.008DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4827927PMC
February 2016

Radial line-scans as representative sampling strategy in dried-droplet laser ablation of liquid samples deposited on pre-cut filter paper disks.

Spectrochim Acta Part B At Spectrosc 2014 Nov;101:123-129

Institute of Chemical Technologies and Analytics, Vienna University of Technology, Vienna, Austria.

Nebulising liquid samples and using the aerosol thus obtained for further analysis is the standard method in many current analytical techniques, also with inductively coupled plasma (ICP)-based devices. With such a set-up, quantification via external calibration is usually straightforward for samples with aqueous or close-to-aqueous matrix composition. However, there is a variety of more complex samples. Read More

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http://dx.doi.org/10.1016/j.sab.2014.07.023DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4210661PMC
November 2014
9 Reads

Combined evaluation of grazing incidence X-ray fluorescence and X-ray reflectivity data for improved profiling of ultra-shallow depth distributions.

Spectrochim Acta Part B At Spectrosc 2014 Sep;99(100):121-128

Atominstitut, Vienna University of Technology, Stadionallee 2, A-1020 Vienna, Austria.

The continuous downscaling of the process size for semiconductor devices pushes the junction depths and consequentially the implantation depths to the top few nanometers of the Si substrate. This motivates the need for sensitive methods capable of analyzing dopant distribution, total dose and possible impurities. X-ray techniques utilizing the external reflection of X-rays are very surface sensitive, hence providing a non-destructive tool for process analysis and control. Read More

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http://dx.doi.org/10.1016/j.sab.2014.06.019DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4152003PMC
September 2014
6 Reads

On-line pre-reduction of pentavalent arsenicals by thioglycolic acid for speciation analysis by selective hydride generation-cryotrapping-atomic absorption spectrometry.

Spectrochim Acta Part B At Spectrosc 2008 Jun;63(6):685-691

Institute of Analytical Chemistry of the ASCR, v.v.i., Vídeòská 1083, 14220 Prague, Czech Republic.

An improvement of current method of selective hydride generation based on pre-reduction for differentiation of tri- and pentavalent arsenicals is described, applied for the oxidation state specific speciation analysis of inorganic, mono-, di- and trimethylated arsenicals with minimum sample pretreatment using atomic absorption spectrometry with the multiatomizer. The preconcentration and separation of arsine, methylarsine, dimethylarsine and trimethylarsine is then carried out by means of cryotrapping. Presented study shows that 2% (m/v) L-cysteine hydrochloride monohydrate (L-cys) currently used for off-line pre-reduction of pentavalent arsenicals can be substituted with 1% (m/v) thioglycolic acid (TGA). Read More

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http://dx.doi.org/10.1016/j.sab.2008.04.006DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2597875PMC

Oxidation State Specific Generation of Arsines from Methylated Arsenicals Based on L- Cysteine Treatment in Buffered Media for Speciation Analysis by Hydride Generation - Automated Cryotrapping - Gas Chromatography-Atomic Absorption Spectrometry with the Multiatomizer.

Spectrochim Acta Part B At Spectrosc 2008 Mar;63(3):396-406

Institute of Analytical Chemistry of the ASCR, v.v.i., Vídeňská 1083, 14220 Prague, Czech Republic.

An automated system for hydride generation - cryotrapping- gas chromatography - atomic absorption spectrometry with the multiatomizer is described. Arsines are preconcentrated and separated in a Chromosorb filled U-tube. An automated cryotrapping unit, employing nitrogen gas formed upon heating in the detection phase for the displacement of the cooling liquid nitrogen, has been developed. Read More

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http://dx.doi.org/10.1016/j.sab.2007.11.037DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2408738PMC
March 2008
18 Reads

Nanosensing at the single cell level.

Authors:
Tuan Vo-Dinh

Spectrochim Acta Part B At Spectrosc 2008 Feb;63(2):95-103

Fitzpatrick Institute for Photonics, Department of Biomedical Engineering and Department of Chemistry, Duke University, Durham, NC 27708, USA.

This article presents an overview of the development, operation, and applications of optical nanobiosensors for use in detection of biotargets in individual living cells. The nanobiosensors are equipped with immobilized bioreceptor probes (e.g. Read More

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http://dx.doi.org/10.1016/j.sab.2007.11.027DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4022309PMC
February 2008
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