sing the calibration curve recorded at 230nm (black dots). a. what is the concentration of an unknown solution that had a ratio of ddt:chloroform of 0.854 in mm? b. if the unknown was analyzed four times, what is the error (ux) on the concentration? c. look up the structure of ddt and chloroform. if ddt eluted after chloroform, would the column be polar or non-polar? d. in gas chromatography, is it more likely that band broadening is due to longitudinal diffusion or mass transfer? explain your answer in 1-2 sentences. 2. looking at the two calibration curves, a. which calibration curve has the greatest sensitivity? b. calculate the lod for each calibration curve c. calculate the loq for the calibration curve recorded at 230nm
