126. Solving a chemistry problem

126. Solving a chemistry problem

20. Ethanol was determined in blood on a gas chromatograph with DIP using the internal standard method. Ethylbenzene was used as an internal standard. When analyzing a solution containing 2 mg/ml of ethanol and ethylbenzene, chromatographic peaks with an area of 401 mm2 and 859 mm2, respectively, were obtained. To determine ethanol in the blood, 2 mg of ethylbenzene was added to 1 ml of the sample and a chromatogram was obtained, in which the peak area of ethanol was 425 mm2, and that of ethylbenzene was 1230 mm2. Calculate the concentration (mg/ml) of ethanol in the blood.

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