Analuytical Chemistry / Quantitative Chemistry To determine the concentration of

Question

Analuytical Chemistry / Quantitative Chemistry

To determine the concentration of ethyl acetate in a sample, you use a chromatographic method with butyl acetate as an internal standard .A solution containing 1.41 ppm of ethyl acetate and 1.55 ppm of butyl acetate resulted in an area of 309 for ethyl acetate, and 358 for butyl acetate. To measure the sample, 1.00 mL of a standard sample of butyl acetate containing 2.33 ppm was mixed with 1.00 mL of the unknown. Analysis yielded a peak area of 495 for ethyl acetate and 413 butyl acetate. What is the concentration of the ethyl acetate in the original, undiluted unknown? Number ethyl acetate- ppm

Explanation / Answer

The concentration of ethyl acetate in the original, undiluted unknown is about 400 ppm in 1.41 mg/L and this is same value for Human expose to this concentration for a short time which might cause nose and throat irritation in humans.

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