NASA Scientific and Technical Aerospace Reports

for normal physiological function of animals and humans. The Food and Nutrition Board of the National Academy of Science
(NAS) sets an adequate intake for manganese at 2.3 mg/day for men and 1.8 mg/day for women, and an upper limit for daily
intake at 11 mg for adults (IOM, 2002). Manganese has a low aesthetic threshold in water. Based on staining and taste, EPA
has set a secondary level for manganese at 0. 05 mg/L which is below the level that may present a health concern. Available
data suggest that regulation of manganese in public water does not present a meaningful basis for health risk reduction. EPA
will present a determination and further analysis in the Federal Register Notice covering the Contaminant Candidate List
proposals.
NTIS
Contaminants; Dosage; Exposure; Health; Manganese; Risk
20040050381 Lawrence Livermore National Lab., Livermore, CA
Inductively Coupled Plasma Mass Spectrometery Uranium Error Propagation
Hickman, D. P.; Maclean, S. C.; Shepley, D.; Shah, R. K.; Jul. 2001; 12 pp.; In English
Report No.(s): DE2004-15006257; UCRL-ID-145113; No Copyright; Avail: Department of Energy Information Bridge
The Hazards Control Department at Lawrence Livermore National Laboratory (LLNL) uses Inductively Coupled Plasma
Mass Spectrometer (ICP/MS) technology to analyze uranium in urine. The ICP/MS used by the Hazards Control Department
is a Perkin-Elmer Elan 6000 ICP/MS. The Department of Energy Laboratory Accreditation Program requires that the total
error be assessed for bioassay measurements. A previous evaluation of the errors associated with the ICP/MS measurement
of uranium demonstrated a (+-) 9.6% error in the range of 0.01 to 0.02(micron)g/l. However, the propagation of total error
for concentrations above and below this level have heretofore been undetermined. This document is an evaluation of the errors
associated with the current LLNL ICP/MS method for a more expanded range of uranium concentrations.
NTIS
Plasmas (Physics); Mass Spectrometers; Inductively Coupled Plasma Mass Spectrometry
20040050575 Kyoto Univ., Japan
Memoirs of the Faculty of Science, Kyoto University: Series of Physics, Astrophysics Geophysics and Chemistry,
Volume 45
March 2004; ISSN 0368-9689; 103 pp.; In English; Copyright; Avail: Other Sources
Time evolution of the 113s(sub 1/2) state of Rb-85 in a pulsed electric field was investigated at the region of the first
avoided-crossing with its adjacent manifold. The state was initially prepared by laser excitations at a well isolated Stark
position from the manifold, and driven into an electric field (FT) over the first avoided crossing point with various slew-rates.
The s(sub 1/2) state was then field-ionized with a following high slew-rate pulsed electric field; Specifically in this field
ionization process with high slew-rate regime, a constant transverse electric field was applied to enhance the tunneling field
ionization process resulting from the angular momentum rotation due to the effect of a rotating electric field. Three paths
through the Stark map were identified with sharp peaks in the ionization field-strength observed. One path corresponds to the
autoionization-like process, while the other two paths are due to the tunneling processes with an adiabatic and a non-adiabatic
transitions, respectively. Transition rates to these ionization paths, measured as a function of the slew rate, were found to be
strongly dependent on how deep the state is driven into the manifold-merged region at F(sub r) before the fast ionization-pulse
was subsequently applied. Quantum theoretical predictions, taking into account explicitly the occurrence of the multilevel
avoided crossings, reproduce well the experimental transition rates to the paths leading to the tunneling field-ionization. The
transitions leading to the autoionization-like process, however, show different behavior from those to the tunneling process,
indicating an interference effect in the process.
Author
Astrophysics; Universities; Geophysics; Chemistry; Science
20040050662 Florida Univ., Gainesville, FL
Conjugated Polyelectrolytes: Synthesis and Applications
Pinto, Mauricio R.; Schanze, Kirk S.; Apr. 28, 2002; 18 pp.; In English
Contract(s)/Grant(s): DAAD19-00-1-0002
Report No.(s): AD-A420917; UF-NIF-10; ARO-40422.55-MS; No Copyright; Avail: CASI; A03, Hardcopy
Conjugated polyelectrolytes are conjugated polymers that feature ionic side groups which render the materials soluble in
water and other polar solvents. In this review we summarize recent work which has been carried out to synthesize a variety
of new conjugated polyelectrolyte structures, including those with poly(paraphenylene), poly(phenylene vinylene) and
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