PNG 550
Reactive Transport in the Subsurface

Figure 4 Breakthrough Curve

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Figure 4. Breakthrough outlet concentration of Br- as a function of number of residence time. C0 is the initial injecting concentration of the tracer Br- while C is the tracer concentration at the outlet.

This breakthrough curve shows 0 C/CO from 0 residence time until about .75 residence time. The C/CO increases rapidly from 0 to 1 between .75 residence time and 1.33 residence time. C/CO remains steady from 1.33 residence time until 3 residence time where the graph ends. You can see an breakdown of the numbers in the table below.

Breakthrough Curve
C/CO Number of residence time
0 ~.75
0.2 ~.8
0.4 ~.99
0.6 ~ 1
0.8 ~1.20
1 ~.33