Oxygen activation analysis

This feasibility study shows that determination of pellet wt by fast neutron oxygen activation analysis can be used for quality assurance inspection of M34 primers. Either direct oxygen analysis, where a comparison standard (such as lucite) is used, or a ratio method, utilizing the Cu in the cup-anvil combination as an internal standard, can be applied. In general, the uniformity of production primers is quite satisfactory, as is usually the case where production procedures are standardized. It seems likely that the light pellet is one which has been improperly manufd and will probably be well below specifications in pellet wt. Production experience with such primers indicates that only one in 3x10s primers is expected to show low pellet wt therefore, one would not expect to find a reject in a small sampling. Nevertheless, detection and rejection of this one bad unit is critical for the prevention of weapon malfunctions and possible injuries to personnel... 

Fiolitakis and Hofmann—wavefront analysis supports Eley-Rideal/redox mechanisms. In 1982 and 1983, Fiolitakis and Hofmann231,232 carried out wavefront analysis to analyze the dependence of the microkinetics of the water-gas shift reaction on the oxidation state of CuO/ZnO. They observed three important mechanisms after treatment of the catalyst surface with different H20/H2 ratios. These included two Eley-Rideal mechanisms which converted the reactants via adsorbed intermediates, and a redox mechanism that regulated the oxygen activity, as shown in Scheme 56. The authors indicated that different mechanisms could be dominating at different sections along the length of the fixed bed reactor. 

Anhydrous hydrogen fluoride, application of for the structural analysis of polysaccharides, 47, 167-202 Anomeric and exo-anomeric effects in carbohydrate chemistry, 47, 45-123 Anomeric-oxygen activation for glycoside synthesis, trichloroacetimidate method, 50,21-123... 

Allen, R. C. (1986). Phagocytic leukocyte oxygenation activities and chemiluminescence A kinetic approach to analysis. Methods Enzymol. 133 B, 449-93. 

NAA NAAQS NBO NCP Neutron activation analysis National ambient air quality standards Non-bridging oxygen Non-carbonate portion... 

Despite the potential to track the spatial movement of marine shell beads, archaeometric attempts at sourcing have been minimal. We are aware of only three other groups that have taken this approach including a neutron activation analysis (NAA) of Busycon sp. shells and artifacts in the American Southeast (/), the use of strontium isotopes as a measure of geologic age of fossil shells in Southwest Europe (2), and the use of oxygen isotope ratios to source Sporufylus sp. beads in Central Europe (5). 

Fig. 5. Use of a 4096-channel analyzer in the multiscaler mode for the determination of oxygen via 14 MeV neutron activation analysis...

One of the earlier and still one of the most interesting applications of coincidence counting in activation analysis is the isotopic determination of 6Li by Coleman 84>. In this method aqueous solutions of LiOH are irradiated with thermal neutrons to produce tritons by means of the 6Li(w,f)4He reaction. The tritons then react with the oxygen in the aqueous solution by the 160(f, )18F reaction. The 18F is a positron... 

Wing, J. Simultaneous Determination of Oxygen and Silicon in Meteorites and Rocks by Non-destructive Activation Analysis. Anal. Chem. 36, 559 (1964). 

Vogt, J. R., and W. D. Ehmann An Automated Procedure for the Determination of Oxygen Using Fast Neutron Activation Analysis Oxygen in Stony Meteorites. Radiochim. Acta 4, 24 (1965). 

Steel, E. L., and W. W. Meinke Determination of Oxygen by Activation Analysis with Fast Neutrons Using a Low-Cost Portable Neutron Generator. Anal. Chem. 34, 185 (1962). 

Barrandon, J. N., and P. Albert Determination of Oxygen Present at the Surface of Metals by Irradiation with 2 MeV Tritons. The 1968 International Conference Modem Trends in Activation Analysis, Gaithersburg, Maryland, October 7—11, 1968, Paper 93. 

Debrun, J. L., J. N. Barrandon, and P. Albert Contribution to Activation Analysis by Charged Particles Determination of Carbon and Oxygen in Pure Metals, Possibilities of Sulphur Determination. The 1968 International Con-... 

The purpose of this study is to apply the unique technique of Charged Particle Activation Analysis (CPAA) to distinguish the characteristics of the oxidation process from a different point of view and define parameters which can be determined by this technique. The parameters to be determined are (1) the kinetics of the adsorption of oxygen containing species, (2) the elemental composition of the oxide layer and how deeply it extends into the particle, and (3) the number of reactive sites on or near the surface. 

Kinetic Experiments. The technique of Charged Particle Activation Analysis (CPAA) for analysis of oxygen in coal has been described previously (J3). In the experiments to study the adsorption of oxygen onto the coal, a slight modification of this procedure has been used. Small lumps of coal were transferred in... 

The cation analyses were performed by conventional wet-chemical techniques. The oxygen content was determined by a reduction method and by neutron activation analysis. 

The general validity of the approach is corroborated by the representative data given in Table VII, that show a very good agreement between elemental sulfur, oxygen, and nitrogen values calculated from the MS composition and conventional measurements obtained respectively by x-ray fluorescence (XRF), neutron activation analysis (NAA), and chemical determinations. 

Oxygen a Kaman Model A711 neutron generator provides 14.3 X 106 eV as activation energy for neutron activation analysis. 

Oxygen is so tightly bound, especially in the substoichiometric compositions, that its analysis can be difficult. Activation analysis (y, n) or the dissolution of the carbide in C-saturated Pt at 2200°C, thereby releasing the oxygen as CO, are used. Dissolved oxygen... 

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