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Displaying 751 - 775 of 3672

Chlorine - Bromine Combination Isotope Intensities

June 9, 2015
Author(s)
Thomas J. Bruno
Due to the distinctive mass spectral patterns caused by the presence of chlorine and bromine in a molecule, interpretation of a mass spectrum can be much easier if the results of the relative isotopic concentrations are known. The following table provides

Gas Chromatographic Retention Indices

June 9, 2015
Author(s)
Thomas J. Bruno
The interpretation of results from chromatographic measurements can often be augmented with an appropriate mathematical treatment of the solute retention that is observed. The goal of treatment is to make the resulting metric as independent of the

Instability of HPLC Solvents

June 9, 2015
Author(s)
Thomas J. Bruno
Solvents that are commonly used in high performance liquid chromatography frequently have inherent chemical instabilities that must be considered when designing an analysis, or in the interpretation of results [1-4] . In many cases, such solvents are

Relative Dose Ranges From Ionizing Radiation

June 9, 2015
Author(s)
Thomas J. Bruno
It is important to place in perspective the relative ionizing radiation dose acquired in common laboratory settings. The most commonly encountered source is a 63Ni source used in gas chromatographic electron captures detectors and in ion mobility

Elemental characterization of Single-Wall Carbon Nanotube (SWCNT-1) reference material by neutron and prompt gamma activation analysis

April 7, 2015
Author(s)
Rick L. Paul, Rabia Oflaz, Jan Kucera, J W Bennett, E. A. De Nadai Fernandes, M. Kubesova, M. A. Bacchi, A. J. Stopic, R. E. Sturgeon, P. Grinberg
Instrumental neutron activation analysis with both relative and k0 standardization was used in four experienced laboratories to determine element mass fractions in single-wall carbon nanotube certified reference material (CRM) SWCNT-1. Results obtained

Methodological Challenges in Including Green Tea Dietary Supplements to Analytically Verified Databases.

April 1, 2015
Author(s)
Kate Rimmer, Leila Saldanha, Johanna Dwyer, Karen Andrews, Regan Bailey, Joseph Betz, Vicki Burt, Rebecca Costello, Nancy Emenaker, Jaime Gahche, J. Harnly, Constance Hardy, Pamela R. Pehrsson
Dietary supplement databases are needed to calculate total dietary intakes from foods and supplements. Analytically verified databases are necessary for commonly consumed products as estimates of intakes are used in guiding public policy decisions. The

NGD Cold Neutron Prompt Gamma-ray Activation Analysis Spectrometer at NIST

April 1, 2015
Author(s)
Rick L. Paul, Dagistan NMN Sahin, Jeremy C. Cook, Christoph W. Brocker, Richard M. Lindstrom, Donna J. O'Kelly
A new instrument for cold neutron prompt gamma-ray activation analysis (CNPGAA) has been designed and constructed as part of the recent expansion of the cold neutron guide hall at the NIST Center for Neutron Research (NCNR). Located on neutron guide NGD
Displaying 751 - 775 of 3672
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