Results 231 to 240 of about 431,788 (279)

Wavelength Anomalies in Ultraviolet-Visible Spectrophotometry

Applied Spectroscopy, 2012
Spectral scans of atomic line emission sources with a Shimadzu UV2101PC spectrophotometer show that the nominal wavelength depends upon the instrumental slit width, the wavelength sampling interval, and for some slit widths, also on the specified spectral range.
openaire   +2 more sources

Rocket Ultraviolet Spectrophotometry of Comet Kohoutek (1973f)

Science, 1974
Observations of Comet Kohoutek (1973f) in the spectral region between 1200 and 3200 angstroms were made from an Aerobee rocket on 5.1 January 1974 universal time. The strongest features observed were the Lyman alpha line of neutral atomic hydrogen at 1216 angstroms and the hydroxyl (OH) bands at 3090 and 3142 angstroms.
P D, Feldman, P Z, Takacs, W G, Fastie, B, Donn   +3 more
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Solvents for ultraviolet spectrophotometry

Talanta, 1959
Abstract Mathematical relations are presented showing the effect of light absorption by the solvent on the absorption measurements. A simple modification in the silica-gel adsorption method of purifying iso octane is described that greatly improves the transmittance in the 2000 A region. A procedure of purifying dioxan is also included.
openaire   +1 more source

Ion-exchanger ultraviolet spectrophotometry for uranium(VI)

Talanta, 1983
A sensitive method based on solid-phase spectrophotometry has been developed for the microdetermination of uranium(VI) in water samples. Uranium is sorbed on the anion-exchanger QAE-Sephadex from thiocyanate solution and the absorbance of the exchanger is measured at 300 nm.
H, Waki, J, Korkisch
openaire   +2 more sources

Instrumental and chemometric analysis of opiates via gas chromatography–vacuum ultraviolet spectrophotometry (GC-VUV)

Analytical and Bioanalytical Chemistry, 2020
Zackery R. Roberson, Heather C. Gordon, J. Goodpaster   +2 more
semanticscholar   +1 more source

Unusual Applications of Ultraviolet Spectrophotometry

Applied Spectroscopy, 1952
Ultraviolet spectrophotometry has demonstrated its usefulness in application to problems of identification and qualitative analysis, molecular structure studies, and quantitative analysis, even of multi-component systems. The ability to observe the spectra of ions in solution has been of great usefulness in molecular structure investigations and in the
openaire   +1 more source

Use of ultraviolet–visible spectrophotometry associated with artificial neural networks as an alternative for determining the water quality index

Environmental Monitoring & Assessment, 2018
Edson Marcelino Alves, Ramon Juliano Rodrigues, Caroline dos Santos Corrêa, Tiago Fidemann, J. C. Rocha, J. L. Buzzo, Pedro de Oliva Neto, E. G. F. Núñez   +7 more
semanticscholar   +1 more source

Infrared and ultraviolet spectrophotometry in residue evaluations

1964
In order to begin this discussion of infrared and ultraviolet spectrophotometry in residue evaluations, it is important to discuss briefly the broad field of spectrophotometry and to define the various regions of the electromagnetic spectrum of interest.
openaire   +2 more sources

Development of vortex-assisted ionic liquid-dispersive microextraction methodology for vanillin monitoring in food products using ultraviolet-visible spectrophotometry

LWT, 2018
Nail Altunay
semanticscholar   +1 more source

Use of UV-Vis Spectrophotometry for Characterization of Carbon Nanostructures: a Review

Theoretical and Experimental Chemistry, 2021
M. Abdolkarimi-Mahabadi, A. Bayat, A. Mohammadi   +2 more
semanticscholar   +1 more source