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Author: Bollo-Kamara, Arthur
Publisher: National Library of Canada
ISBN: 9780315092129
Category : Emission spectroscopy
Languages : en
Pages : 356
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Book Description
![Studies on the Development and Characterization of a Microwave Induced Plasma for Optical Emission Spectrometry [microform] PDF](https://books.google.com/books/content/images/frontcover/UqgcywAACAAJ?fife=w80-h100)
Author: Bollo-Kamara, Arthur
Publisher: National Library of Canada
ISBN: 9780315092129
Category : Emission spectroscopy
Languages : en
Pages : 356
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Book Description
Author: Krzysztof J. Jankowski
Publisher: Royal Society of Chemistry
ISBN: 1849730520
Category : Science
Languages : en
Pages : 263
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Book Description
This book is the most comprehensive publication on MWP technology and MWP-OES analytical spectrometry with an emphasis on practical issues.
Author: Charles Bryson Williams (III)
Publisher:
ISBN:
Category :
Languages : en
Pages : 138
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Book Description
Microwave-induced plasma optical emission spectrometry (MIP OES) is a technique within Atomic Spectrometry which is rapidly growing, following the relatively recent introduction of a complete commercial instrument based on the Hammer-cavity MIP. It offers advantages of low cost and simple operation, as well as the ability to run on air, enabling it to be used in remote areas or places with underdeveloped infrastructure. Due to the relative novelty of the technique, intensive method development for specific sample types is necessary to expand the utility of the technique and compensate for some of its limitations, such as its relatively low robustness and sequential detection. In addition, developments in plasma diagnostics and novel calibration strategies are also important to help increase the prominence and utility of the technique. The present research covers several such applications and efforts to improve instrumentation performance, as well as more fundamental studies of the properties of the plasma. In the first project, a method was developed to determine concentrations of Ca, K, and Na in various soft drinks. Addition and recovery experiments were used to evaluate the accuracy of the method. This study shows the ability of the technique to withstand relatively complex matrices, with no sample preparation other than simple dilution, and produce accurate results with traditional calibration methods. The second project involved development of a rapid dry-ashing technique to prepare samples for analysis using MIP. Calcium, Fe, K, Mg, Na and Zn were determined in complex-matrix samples such as tomato leaves, cheese, butter, peanut butter, infant formula and biodiesel samples. General agreement was also found between MIP OES results from samples decomposed either by the dry-ashing method or by a conventional microwave-assisted digestion procedure, and accurate results were found when applying the new, simpler method in certified reference material analyses. In the third project, several molecular species, naturally occurring in the plasma, were evaluated for their use as a plasma diagnostic tool. The N2+ / OH emission intensity ratio was evaluated for identifying the best instrumental operating conditions in MIP OES. Aluminum, Ba, Mn, Sr and Zn (analytes), and high concentrations of C, Na, Ca, HNO3 and HCl (sample matrices) were used as models to investigate the effects of complex matrices on analyte recoveries. The N2+ / OH signal ratio was more sensitive to changes in plasma conditions than the traditionally-used Mg II / Mg I ratio. Some other advantages include real-time monitoring capabilities, and the possibility of independently tracking variations in both plasma and sample introduction. Significant improvements in accuracy were achieved by employing the analyte-to-molecular species signal ratio, or their product, for calibration. In the final project, a novel calibration method, multi-flow calibration (MFC), was proposed. This strategy involves the use of multiple nebulization gas flow rates in the analysis to mitigate error caused by employing suboptimal sample introduction conditions, and to eliminate the need for optimization of conditions. The new calibration method was applied to the determination of Cr, Cu, Fe, and Mn in water and food samples. Addition recovery experiments and certified reference materials were used to validate the method. Multi-flow calibration presents comparable or superior accuracy to the traditional external standard calibration (EC), and offers simpler sample preparation than EC, requiring only a single standard and no modification of the sample introduction equipment.
Author:
Publisher:
ISBN:
Category : Canada
Languages : en
Pages : 1292
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Author: Yong Nam Pak
Publisher:
ISBN:
Category : Helium at low temperatures
Languages : en
Pages : 570
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Book Description
Author: José Alfons Clement Broekaert
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Author: National Institute of Standards and Technology (U.S.)
Publisher:
ISBN:
Category :
Languages : en
Pages : 1162
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Book Description
Author: Fu-He Li
Publisher:
ISBN:
Category : Atomic emission spectroscopy
Languages : en
Pages : 646
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Book Description
Author: Leonard J. Galante
Publisher:
ISBN:
Category :
Languages : en
Pages : 42
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Book Description
A microwave induced plasma (MIP) sustained in helium is evaluated as an element selective detector for capillary supercritical fluid chromatography (SFC). The plasma source, a surface microwave induced plasma (surfatron), is described. Optimal plasma conditions including viewing position, helium flow rate, and applied microwave power are discussed for sulfur emission in the near-infrared spectral region. In addition, the effects of two common mobile phases (CO2 and N2O) on plasma stability, sensitivity, and spectral background from 200 nm to 1100 nm are assessed. Although the plasma was evaluated principally for use with SFC, much of the discussion is relevant to its application as a gas chromatographic detector. Keywords: Supercritical fluid chromatography; Nonmetal detection; Spectroscopic detector; Speciation; Sulfur detection. (jd/rh).
Author: Andreas Boesch
Publisher:
ISBN:
Category :
Languages : en
Pages : 0
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Book Description
Spectroscopy is one of the most powerful techniques to analyze light of astronomical objects. New instrumentation strives to extend high-precision spectroscopy from the optical to the near-infrared spectral range. This development is driven by research on cool low-mass stars and the search for low-mass extrasolar planets with the radial velocity technique. A crucial requirement for precise spectroscopic measurements is the wavelength calibration that maps the pixels of a spectrograph's detector to the corresponding wavelengths. In the optical, hollow cathode lamps and gas absorption cells a ...
