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Instrument Section Theory Test Name Score 1. Single-choice question 1. The phenomenon ( ) is not allowed to appear in the post handover record. A. Trade the old for the new B. Cross out and change content C. Tear leaves and rewrite D. Signed by both parties 2. The dry point of naphtha is measured with ( ). A． Thermometer B. Density meter C. Viscometer D. Distillation range meter 3. When handling chemical liquids, you should use ( ) to protect your face. A． Sunglasses B. Protective mask C. Towel D. Gauze 4. When the electronic balance displays ( ), weighing can be carried out. A． 0.0000B. CAL C. TARE D. OL 5 In a complete gas chromatography gas path diagram, the items that can be omitted are ( ). A． Air source and voltage stabilizing device B. Quantitative tube C. Column D. Printer 6. Gas chromatography is suitable for analysis ( ). A gas and volatile sample B. Solid sample C. Thermal unstable sample D. The polymer sample 7 mechanical balance is designed based on the ( ) principle. A. Balance B. Stable C. Leverage D. Equal arm 8. The function of the atomization system of the atomic absorption instrument is to convert the element to be measured in a sample into ( ). A． Excited atom B. Excited state molecule C. Molecular vapor D. Atomic steam 9. When measuring moisture content by Karl Fischer method, adjust the stirring speed according to ( ). A． Injection volume B. Reagent consumption C. Titration speed D. There are no bubbles in the titration cell 10. In the process of analyzing microcoulomb analysis, the starting point for considering the problem should be around ( ). A． Titration cell B. Amplifier C sample properties D. Combustion tube 2. Questions and Answers 1. Briefly describe the causes of noise and drift in gas chromatography? 2. What are the instrument parameters that affect microcoulomb analysis? 3. What should you pay attention to during propane and butane sampling? 4. Write the molecular formulas, simplified structural formulas and molecular weights of butane, 1-butene and toluene. three. Calculation question 1. In the determination of methanol content in 1-butene, under the steady state of the instrument, the standard sample with a known concentration of 20PPM (methanol/water) was analyzed twice. The peak areas of methanol obtained in the two analyzes of the 20PPM standard sample were 2286 and 2306 respectively. ； The 1--butene sample weighs 891.3 grams before absorption, and the cylinder weighs 868.5 grams after absorption. The aqueous solution in the absorption tube is 10 ml. The peak areas of methanol obtained by analyzing the aqueous solution in the absorption tube twice are 775 and 786 respectively. Please calculate the methanol content in the 1--butene sample. 2. When analyzing a mixed aromatic sample, the measured area of benzene in the sample was 1100 and the area of toluene was 2000 (the areas of other components are omitted). Accurately weigh 40.00 grams of the sample, add 0.40 grams of toluene and mix evenly. After mixing on the same chromatograph, the area of benzene and the area of toluene were measured to be 1200 and 2400, please calculate the content of toluene?