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EM 1110-1-4001 <br /> 3 Jun 02 <br /> 1000 <br /> A, ❑ ❑ <br /> 100 <br /> Cg- <br /> CIO 10 <br /> U <br /> O <br /> U <br /> ^C3 <br /> 1 ❑ Measurements <br /> Early Fit (Eqn F-8) <br /> W — — Late Fit (Eqn F-14) <br /> 0.1 <br /> 0 50 100 150 200 <br /> Elapsed Days <br /> Figure F-2 Approximate equation fits to the example concentration history during SVE <br /> The use of equations (F-8)and (F-14) is illustrated in Figure F-2 with the example data described <br /> previously The slope of the early fit yields, <br /> Q = 0 26 days-' (F-18) <br /> RmV,�, <br /> and the mobile volume parameter can be estimated if the extraction rate and retardation factor are <br /> available The time scale for the initial flush as calculated with(F-10) is about nine days Utilizing <br /> result(F-18)with (F-14), the best fit to the later data in Figure F-2 was achieved with the following mass <br /> transfer parameter, <br /> a = 0 073 days-' (F-19) <br /> R, <br /> Variation of this parameter corresponded to changes in the slope for the fit while the initial concentration <br /> in the immobile region was vaned to move the line up and down The timescale for the rebound <br /> concentration to approach equilibrium can be calculated with (F-17) Using(F-19) an estimate of about <br /> 30 days is obtained <br /> F-8 <br />