Читать книгу Process Gas Chromatographs - Tony Waters - Страница 34

1 Q1. In gas‐liquid chromatography, what are the gas and liquid doing?Select the one correct answer:They are both moving.The gas is moving, and the liquid is stationary.The gas is stationary, and the liquid is moving.They are both stationary.

2 Q2. In a gas chromatograph, which one of the gases listed below would not suitable as the carrier gas?Select the one correct answer:OxygenNitrogenHydrogenHelium

3 Q3. In a gas‐liquid chromatograph, which one of the materials listed below might be the stationary phase?Select the one correct answer:An inert gasA granular adsorbent solidA volatile liquidA non‐volatile liquid

4 Q4. In a gas‐liquid chromatograph, what really causes the separation?Select the one best answer:The carrier gas causes the separation.The mobile phase causes the separation.The stationary phase causes the separation.The chromatogram causes the separation.

5 Q5. In a gas chromatograph, what do the columns do?Select the one best answer:They convert all the components into peaks.They separate the analytes from all other components and from each other.They separate all the components of the sample.They allow only measured components to enter each detector.

6 Q6. In a gas chromatograph, what does a detector do?Select the one best answer:It provides a continuous flat baseline as a reference for measuring the peaks.It generates a signal proportional to the instantaneous number of component molecules leaving the column.It measures either the area or the height of each peak.It converts each component of the sample to a concentration.

7 Q7. Why is the chromatogram so important?Select the one best answer:It shows the baseline used for measuring the peaks.It shows the shape of each peak.It shows the separation between peaks.All of the above.Check your SAQ answers with those given at the end of the book.