Question

Respon A scientist wishes to measure the concentration of methyl benzoate in a plant stream by gas chromatography. He prepares a sample of butyl benzoate to use as an internal standard. The results of a preliminary run, which used a solution known to contain 1.71 mg/ml, of methyl benzoate (peak A) and 1.88 mg/mL of butyl benzoate (peak B), are shown. The area of peak A is determined to be 326 and the area of peak B is determined to be 3.90 x 10 measured in arbitrary units by the computer. To measure the sample, 1.00 mL of a standard sample of butyl benzoate containing 2.15 mg/mL is mixed with 1.00 mL of the plant stream material. Analysis of the mixture gave a peak area of 493 for peak A and 397 for peak B. What is the concentration of methyl benzoate in the plant stream? Time (min methyl benzoate concentration: mg/mL

Answer 1

1Geven data, FOI peak Ai methyl benzoate 1.71 mg ime goue anarca 326 For peak Bi Butyl benzoate 1.88 mg) mu gave an agar 390. Response factor= Peat B Peak A = (3901188) (326|171) 207.44. 190.64 21.088 Criven that, Peak Bi Blityl benzoate 2015 mai mu gave an arca 397 Peak Ri methyl benzonte x mgıml game an area 493 concentration of methyl benzoode paresent _ 493 89712:15) 11.088 -2.90 mg/me