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{"ops":[{"insert":"A packed chromatographic column is a piece of tubing through\nwhich a carrier fluid flows; it is packed with a porous medium\nthat has a significant tendency to sorb chemicals of interest. A\npulse of 2,4-dinitrotoluene is injected into one end of the\ncolumn, and then moves at a velocity according to its distribution\ncoefficient between the moving fluid and the porous medium.\u0000\n"}]}
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