【Daily Question】1/9/2016: Participation +2 Wealth； +3 to 8 wealth for correct answers
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This post was last edited by zjp on 2016-1-11 08:08. To increase the popularity of the chemical analysis section, a \"One Question per Day\" campaign has been launched; it aims to foster active technical exchanges while also providing financial rewards to users. 【Daily Question】 (Single-choice question) The purpose of stationary phase aging is ( ). A. Remove water adsorbed on the surface; B. Remove powdered substances in the stationary phase; C. Remove residual solvents and other volatile substances in the stationary phase; D. Improve separation efficiency. Correct answer: C. Post your answer in the replies to participate – you will receive +2 wealth points. If you answer all questions correctly, you’ll get an additional +3 to +8 wealth points. Those who provide thorough analyses and explanations for the questions (or include detailed calculation processes) will receive extra wealth points as a reward. If your answer is correct and your analysis/explanation is accurate, it will be marked as the best reply (or the best assistance). Feel free to answer the questions. Note: We will close this post after 24 hours, and at that time we will announce the best reply (the best assistance), as well as the answer and explanation.
C removes the residual solvent and other volatile substances in the stationary phase
The correct answer is: The purpose of stationary phase aging is (C). A Remove water adsorbed on the surface. B Remove powdery substances in the stationary phase. C Remove residual solvents and other volatile substances in the stationary phase. D Improve separation efficiency
The purpose of stationary phase aging is (D). A. Remove water adsorbed on the surface; B. Remove powdered substances present in the stationary phase; C. Remove residual solvents and other volatile substances from the stationary phase; D. Improve separation efficiency. The purpose of aging is to ventilate and bake the chromatography column of the instrument, in order to eliminate impurities that may have been introduced during the filling of the stationary phase, as well as any droplets of stationary liquid that failed to get adsorbed. A chromatography column that has undergone aging exhibits more stable performance and a smoother baseline, which is beneficial for separation. The process carried out by living fossils on the extraction or purification columns used in pre-treatment; these columns are dry before use, with gas present in their packing, which hinders separation. After being exchanged with a solvent, the entire column is placed in a liquid environment, which facilitates separation. Both aim to achieve better separation, but they operate in different environments and use different methods.
The purpose of stationary phase aging is (C) to remove residual solvents and other volatile substances from the stationary phase
C removes the residual solvent and other volatile substances in the stationary phase
The purpose of stationary phase aging is (D) to improve separation efficiency.