【Weekly Question】2017.2.27~3.5Participate +2 Wealth； Correct answer adds +3~10 wealth
Thread Content
In order to increase the popularity of the chemical analysis section, the [Weekly Question] activity is carried out, which not only activates the atmosphere of technical exchanges, but also gives certain wealth rewards to Haiyou. [Weekly question] Multiple choice question The temperature of the gas chromatography detector must ensure that the sample does not appear ( ) phenomenon A. Condensation B. Sublimation C. Decomposition D. Vaporization Standard answer: A. Reply to the post with your answer. Participate in answering questions and receive +2 wealth. All correct answers will receive an additional +3~8 wealth. If you analyze and explain the question or answer well (or have a detailed calculation process), there will be additional wealth rewards. If your answer is correct and your analysis and explanation are accurate, you will be set as the best reply (or best response). Questions are welcome.
A: Because the gas chromatography feed is in the gas phase, the sample components can be accurately analyzed. If there is condensation, it will cause a gas-liquid two-phase. On the one hand, it will affect the chromatography, and on the other hand, it will be inaccurate.
A analysis: If the detector temperature is too low and the sample is not in pure gaseous state but in liquid state when it passes through the column, the detection results will be distorted and the color column will be damaged. Therefore, in general, the detector temperature should be higher than the column temperature, and the FID detector temperature should be set as high as possible. Keep the water vapor generated after the combustion of hydrogen, samples and solvents from condensing, which will affect the life and use of the detector. The corrosion of FID after long-term use is generally caused by the above reasons.