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Showing 1 to 20 of 63 for “"Atomic Absorption Spectroscopy"”.
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Considerations Involving the Use of Atomic Absorption Spectroscopy as a Quantitative Analytical Technique
Made available in DSpace on 2014-12-09T17:34:58Z (GMT). No. of bitstreams: 1 6500829.pdf: 4050111 bytes, checksum: c5b2ffaf5ab4836baa67d07faad71b2e (MD5) Previous issue date: 1964
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THE STUDY AND CHARACTERIZATION OF A NEW PROCEDURE FOR APPLYING CARBIDE COATINGS TO GRAPHITE FURNACES USED IN ATOMIC ABSORPTION SPECTROSCOPY
… carbide coatings to graphite furnaces used in atomic absorption spectroscopy. The proposed method consists of impregnating graphite furnaces, under reduced pressure, with a liquid metal chloride. After soaking in water to hydrolyze the metal chloride to metal oxide, the furnace is fired at high …
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Evaluation of Arsenic and Selenium Quantitation in Marcellus Shales and Flowback Saline Waters using Thiol Cotton Fibre-Graphite Furnace Atomic Absorption Spectroscopy and Diffusive Gradient in Thin Film Techniques
… and selenium was carried out by graphite furnace atomic spectroscopy (GFAAS). Extraction of arsenic and selenium from Marcellus shale exposed to HSW and WRF6 for varying lengths of time is also reported.;In addition, the role of hydrofluoric acid in microwave-assisted digestion and in the …
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Determination of Organic Compounds by Atomic Absorption Spectrophotometry (AAS) with Special Reference to Compounds Encountered in Environmental Problems
… for the determination of organic compounds by atomic absorption spectroscopy is given. The various techniques used are summarised, two examples chosen and discussed in detail in order to demonstrate the feasibility of the method. Saccharin, an important artificial sweetener, and common food …
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REACTIVE GASES IN ELECTROTHERMAL ATOMISATION ATOMIC ABSORPTION SPECTROMETRY
… been used as matrix modifiers in electrothermal atomic absorption spectroscopy (ETAAS). Oxidising gases such as air or nitrous-oxide, introduced during the charring stage, both thermally stabilised analytes such as lead, and improved the efficiency of pyrolysis by converting the normal charring …
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The microwave digestion of solids
… analysis of biological and chemical samples by atomic absorption spectroscopy (AAS) and inductively coupled plasma atomic emission spectroscopy (ICP-AES) involves the time consuming operation of digesting the samples in acid on a hot plate. However, much time saving has been demonstrated by the …
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Determination of Select Metal Ions in Commercially Available Conventional and Organic Baby Foods.
… diluted, and analyzed for metal content by flame atomic absorption spectroscopy with the regular standard calibration curve and standard addition method. There was little overall difference in metal content between the conventional and organic foods tested.</p>
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A Dendrochemical Analysis of Lead, Aluminum, and Calcium in Southern Appalachian American Beech.
… sections of ten-year periods, and analyzed using atomic absorption spectroscopy. Concentrations of metals were negatively correlated with ring width. Elevation and aspect were significantly associated with the concentration of the cations analyzed. Both lead and calcium concentrations increased …
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Comparison of an Advanced Mercury Analyzer with the Cold Vapor Atomic Absorption Technique for the Determination of Mercury in Coal
… for mercury analysis has been the cold vapor atomic absorption spectrometric technique (CVAAS). Recent developments in improving this technique have focused on procedures for concentrating mercury in the analyte or materials to improve detection. The LECO Corporation produces an Advanced …
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The Copper Status of Vegetarian and Non-vegetarian Men
… copper. Plasma copper levels were measured by atomic absorption spectroscopy. Plasma cholesterol, triacyclglycerols, HDL cholesterol, LDL cholesterol VLDL cholesterol were also determined. Twenty-four hour recalls and three-day food records were obtained to determine copper, zinc, energy, …
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A Comparison of Bioaccumulation and Digestive Enzyme Solubilization of Copper in Two Species of Sea Cucumbers with Different Feeding Habits.
… and analyzed for copper concentration using atomic absorption spectroscopy. A trend was present, exhibiting a small dose dependent curve. The results did not show a significant difference between species or treatments. This study indicates that feeding mode may influence the amount of copper …
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Pulse microwave mediated sample clean-up method to analyse trace metals, PCBs and pesticides, and for treatment of organic wastes
… This step must precede trace metal analysis by atomic absorption spectroscopy. Conventional wet ashing procedure using hot plate takes several hours. Digestion of animal and plant tissues by 5.0 ml, 10.0 ml or 20.0 ml of $\rm H\sb2SO\sb4$ (95.0-98%)/HNO$\sb3$ (69-71%) (v/v) (1:1) acid mixture …
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Corrosion and electrochemical behavior of Indium and Indium-Bismuth alloys in hydrochloric acid
… using X-ray, scanning electron microscopy, atomic absorption spectroscopy, and cyclic voltammetry techniques.</p> <p>Calculated activation energy values indicated that the corrosion of In-Bi alloys was activation controlled. The effect of amine mixtures on the corrosion of In and …
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The determination of several metals in organic separates of selected South African shales
… Ni, Cu, Ag, Au, Zn, Pb and Tl are determined by Atomic Absorption Spectroscopy in soluble organic and total organic separates from thirty-six samples of South African carboniferous shales. The whole rock values for most of these elements in the samples are known and can be compared with the …
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Copper and rheumatoid arthritis - an in vitro study of metal-protein interactions
… The ultrafiltrate was analysed using HPLC and atomic absorption spectroscopy. Protein preparation was found to be important and the different methods used for protein purification were compared using gel electrophoresis and atomic absorption. Binding studies of chelating agents as well as …
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Analytical studies of the degradation of cellulose nitrate artefacts
… degradation, by visual inspection and FTTR spectroscopy. A more thorough analysis of the artefacts was carried out, using ion chromatography, xray fluorescence spectroscopy and atomic absorption spectroscopy, to identify compositional differences between samples, which may relate to …
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Empirical investigation of water pollution control through use of Phragmites australis
… in the PA plants were determined using flame atomic absorption spectroscopy (FAAS) and transmission electron microscopy (TEM) respectively. Leachates from contaminated plant biomass were mixed with silver nitrate to assess the manufacture of metal nanoparticles as an added value step in the …
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Adsorption of cobalt, chromium and barium on ripidolite and kaolinite as examined by x-ray photoelectron spectroscopy
X-ray photoelectron spectroscopy (XPS) has been used to study the bonding of adsorbed metal cations to clay minerals. Binding energy differences of the adsorbed metal cations can be related to changes in the electron density or charge on the atom of interest. Adsorption experiments were carried out …
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Geochemical and Taphonomic Signatures of Freshwater Mussel Shells as Evidence of Mercury-Related Extirpations in the North Fork Holston River, Virginia
… of 40 shells for geochemical signatures using atomic absorption spectroscopy indicated a strong longitudinal pattern. Mercury content was as follows: upstream sites had low Hg concentrations (<5 to 31ppb), shells directly below Saltville had high concentrations (23-4,637ppb), shells 18km …
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