Final report, DOE-EPsCoR Grant No. DE-FG02-99ER45754: Removal of organic contaminants from water via spray processes Page: 4 of 8
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Figure 1: The effect of chamber volume and extraction gas flow rate on extraction time
0.9 -- 4.4mL
0 50 100 150 200 250 300
Row Rate (rnrmin.)
Effect of temperature. A series of experiments were performed, varying the
temperature in 10 degree increments from 25 *C to 85 *C while holding all other
variables constant. At higher temperatures, analytes should more readily be extracted
from water, and some transport phenomena should decrease. Profiles were obtained by
making 100 pL gas and aqueous injections of 868 gg/L m-xylene into a 14.2 mL RASE
system. The extraction gas flow rate was 95 milmin with 30 mI~min going directly to
the FID, and 65 mI~min out the split vent. The results of this experiment are shown in
Figure 3. The extraction time for the experiment at 85 *C is statistically different from
those in the range from 45 *C to 75 *C. However, the data within this range are
statistically similar, as are the results at 25 *C and 35 *C. Overall, extraction time
decreases by only a factor of 2 from 85 "C to 25 *C. Temperature can have two effects on
the overall process. Obviously, the vapor pressure of the analyte increases with
temperature, and analytes should be extracted from water more easily. Temperature also
is important with regards to transport of the analytes after extraction. This condensation
could occur on the walls of the extractor body, in the dryer, or in the transfer line to the
detector. The increase in extraction time with higher temperature is relatively less at
lower temperature, but becomes the most significant change at the higher part of the
temperature range for these experiments.
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Borgerding, Anthony J. Final report, DOE-EPsCoR Grant No. DE-FG02-99ER45754: Removal of organic contaminants from water via spray processes, report, December 12, 2000; United States. (digital.library.unt.edu/ark:/67531/metadc723041/m1/4/: accessed December 12, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.