By Theodore Kuwana
Actual equipment in glossy Chemical research V1
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Extra resources for Physical Methods in Modern Chemical Analysis. Volume 1
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F. Capillary Columns Much of the previous discussion has been directed to the use of packed columns. However, capillary columns are used for an increasing number of analyses, especially for mixtures with 20 or more components. 5 mm and can be divided into three types. Classical open-tubular columns result when a coating of the liquid phase is applied to the internal wall of the capillary tubing (WCOT). If the internal wall of the tubing is treated to make it more porous, a larger amount of liquid phase can be applied; such columns are referred to as PLOT columns.
15 Disk integrator tracing. (3) Cut and weigh This is the next most accurate method and may be the one of necessity for an asymmetrical peak when other methods are not available. However, it is a method of last resort which requires a great deal of time and effort, and results in the destruction of the Chromatographie record unless a photographic copy is made. (4) Planimeter This is a mechanical device that is designed to measure the areas of irregular peaks. It is not accurate for small peaks and is not any more precise than geometrical approximations for symmetrical peaks.
In addition, because changes in temperature are easy to make with a gas Chromatographie system, the data for plots of logK versus 1/T are easy to obtain and yield the value for heat of adsorption or absorption, AH. The slope is equal to —AH/23R, and the intercept is equal to — AS/23R. The equilibrium constant can be used to estimate the solubility of a solute in the liquid phase if the saturation vapor pressure is known. 7χί0 7 )/Κ β Ρ ο Μ Ι (28) where p0 is the saturation vapor pressure of the solute and Mt is the molecular weight of the liquid phase.