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A packed chromatographic column is a piece of tubing through which a carrier fluid flows; it is packed with a porous medium that has a
A packed chromatographic column is a piece of tubing through
which a carrier fluid flows; it is packed with a porous medium that
has a significant tendency to sorb chemicals of interest. A pulse of
a mixture of chemicals is injected into one end of the column, and
each chemical then moves at a velocity according to its distribution
coefficient between the meving fluid and the porous medium.
Note that this is identical to a sorbing solute being transported by
groundwater.
The elumn has the following characteristics:
of each of chemicals A and B are instantaneously and
simultaneously injected.
a How long does it take the center of mass of chemical A to travel
along the column?
b How long does it take the center of mass of chemical B to travel
along the column?
c What is and the spatial distribution of chemical A after its
center of mass has traveled Assume that the only mixing
process is mechanical dispersion.
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