The dispersion coefficient (D) Is the most popular peak descriptor In flow Injection analysis (FIA). Yet this concept of

A method has been developed for the determination of trimethylselenonium (TMSe) Ion and selenite (Se032™) Ion In urine by anion exchange chromatography, selectively eluting TMSe and Se032'. Since the recoveries are quantitative, a method of additive spikes Is employed to determine TMSe and Se032" Ion concentrations In urine specimens. The TMSe and Se032-chromatographic elutions were collected In vials, Irradiated with neutrons, and radloassayed for 77mSe activity. The limit of detection Is 10 ng of Se as TMSe or Se032"/mL of urine. Thirteen urine specimens from normal subjects were analyzed for TMSe, Se032™, and total selenium concentration.

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Reaction of ,0 Br activated by radiative neutron capture and "Br activated by the reaction " m Br (I. T.) 82 Br were investigated in liquid aqueous solutions of bromomethane, 1-bromobutane and 5-bromouridine. For all liquid aqueous systems, 80 Br total organic product yields decreased with decreasing solute concentrations. For the kinetically energetic 80 Br this was expected since the tendency for aggregation of the solute diminished with decreasing solute concentrations where the probable state of the solute approached a monomolecular dispersion. A new procedure was developed for the determination of "Br yields by isomeric transition activation in liquid aqueous solutions in order to minimize (n,7)-contributions to the organic yields. The "Br organic yields did not show a correlation similar to that for (η,γ)-activated ,0 Br. These results do not lend support for the Auger effect Coulombic explosion model and support other primary processes such as ionization and charge neutralization or direct interaction with Auger electrons resulting in (I. T.)-activated bromine reactions.