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PART A. MOLECULAR NEUTRON ACTIVATION ANALYSIS. PART B. ENERGETIC HALOGEN REACTIONS AND THEIR APPLICATIONS
Abstract
A. Molecular neutron activation analysis (MoNAA) procedures were developed to determine trace quantities of DDT and its metabolites and of trimethylselenonium (TMSe) ion in urine matrix. The basic procedure involves separating the different compounds or molecules present in the sample into single chemical species employing separation techniques such as high-performance liquid chromatography (HPLC), ion exchange chromatography and solvent extraction and then analyzing the separated molecules containing radioactivable atoms in their structure by neutron activation. Confirmation analyses employing mass spectrometry were presented. Detection limits in the parts-per-billion range can be obtained employing a nuclear reactor with a neutron flux of at least 1 x 10('12) neutrons cm('-2) s('-1). B. Reactions of ('80)Br activated by radiative neutron capture and ('82)Br activated by the reaction ('82m)Br(IT)('82)Br were investigated in crystalline and liquid methyl bromide and liquid aqueous solutions of methyl bromide. In all systems the major labelled organic product was methyl bromide. The ('80)Br- and ('82)Br-labelled methyl bromide yields extrapolated to 0.4 (+OR-) 0.1% and 1.4 (+OR-) 0.2%, respectively, at zero solute concentration. Within experimental error these extrapolated yields correspond to methyl bromide gas phase failure-to-bond rupture values. The data suggest that the ('82m)Br(IT)('82)Br process results in energetic bromine species in the liquid state and that Auger effect coulombic explosion model may have limited applicability to small molecules in the liquid state. Solute aggregate formation in liquid aqueous solutions of 5-bromouridine was determined by using a model which employs recoil atom tracer techniques. The populations of the associated species generated from this model were compared with those calculated employing the thermodynamic osmotic property method. The recoil atom tracer technique was also found to be applicable to the study of the populations of aggregates in the methyl halide liquid aqueous systems.
Subject Area
Analytical chemistry
Recommended Citation
OPELANIO-BUENCAMINO, LAURA RANES, "PART A. MOLECULAR NEUTRON ACTIVATION ANALYSIS. PART B. ENERGETIC HALOGEN REACTIONS AND THEIR APPLICATIONS" (1985). ETD collection for University of Nebraska-Lincoln. AAI8620817.
https://digitalcommons.unl.edu/dissertations/AAI8620817