Big Chemical Encyclopedia

Chemical substances, components, reactions, process design ...

Articles Figures Tables About

Moisture, interference with spectrum

IR spectra were recorded with a Beckman Acculab 6 spectrophotometer. Pellets were prepared by torque pressing a finely ground mixture composed of 1-2 mg of sample and 100-500 mg of spectroanalytical KBr. The pellets were translucent brown and showed good dispersion of the sample. Considerable attention was given to prevent moisture interference. The spectrum of a polystyrene film was recorded prior to the sample for QA purposes. [Pg.189]

Figure 18 FTIR spectrum of a mixture of varying amounts of OH-containing components, such as moisture, monoglycerides, and free fatty acids, which may potentially interfere with the determination of hydroperoxide content (PV) in oxidised oils. Figure 18 FTIR spectrum of a mixture of varying amounts of OH-containing components, such as moisture, monoglycerides, and free fatty acids, which may potentially interfere with the determination of hydroperoxide content (PV) in oxidised oils.
It is often necessary to determine the optical path length of salt cells since they are subject to wear and erosion from moisture. To determine the optical path length, b, a spectrum is obtained on the empty cell. Reflections from the internal walls of the cell create an interference pattern that looks like a series of waves in the spectrum. Using as many well-formed waves as possible, the start and ending frequencies (in cm-1) are determined along with the total number of waves. The optical path length is then calculated from the following relationship ... [Pg.145]


See other pages where Moisture, interference with spectrum is mentioned: [Pg.174]    [Pg.681]    [Pg.170]    [Pg.198]    [Pg.126]    [Pg.322]    [Pg.269]   
See also in sourсe #XX -- [ Pg.110 ]




SEARCH



Interference spectrum

© 2024 chempedia.info