The rate at which a contaminant spreads in an aquifer (an underground system of

Question

The rate at which a contaminant spreads in an aquifer (an underground system of springs and streams) can be measured by injecting a dye at one point and monitoring its appearance at remote locations. Describe the experiment in chromatographic terms. Specifically, identify the type of chromatography (i.e., the phase of the elutant and the stationary support), the broadening. b) Fluorescein is injected into a well at a chemical plant. After 27 days, the dye is detected in a well 16 meters away. At what time will the dye appear in a third well 82 meters from the first. What assumptions have you made?

Explanation / Answer

Solution:

For aquifier dye analysis Liquid Chromatography is used with alumina as stationary phase for its strong polar absorbent nature, it helps in analyze of metal ions and organic compounds in solutions. It uses liquids which may incorporate hydrophilic, insoluble molecules.

By using algebraic expression / methodology the time is computed by assuming the flowrate (or) diffusion of dye is at steady phase,

(16/27) = 0.5926 m per day hence for 82 meters we get 82 / 0.5926 = 138.37 days approx 138 days

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