Question 7 of 7 >

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 1.83 mg/mL of methyl

benzoate (peak A) and 2.01 mg/mL of butyl benzoate (peak B), are shown. The area of peak A

is determined to be 304 and the area of peak B is determined to be 3.60 x 10² measured in

arbitrary units by the computer.

Macmillan Learning

To measure the sample, 1.00 ml. of a standard sample of butyl benzoate containing 2.37 mg/ml.

is mixed with 1.00 mL of the plant stream material. Analysis of the mixture gave a peak area of

469 for peak A and 411 for peak B.

What is the concentration of methyl benzoate in the plant stream?

methyl benzoate concentration:

Lic

Detector Response

10

Time (min)

15

mg/mL