从今天开始，我将把自己这三年来的仪器英语全部每天更新，每天练习仪器英语口语，分享在这里，需要音频的请留言。 科研仪器英语口语每日一练 This is Daily English Learning of Analytical Instrument. Today the topic is gas chromatography (gc) NOW let's begin the part 1 Vocabularies: 1. 载气系统 carrier gas system 2. 进样口 inlert 3. 色谱柱 column 4. 检测器 detector 5. 数据系统 data system 6. 气相色谱 Gas chromatography 7. 分离及分析化合物 separating and analyzing compounds 8. 载气 carrier gas 9. 固定相 stationary phase 10. 保留时间 retention time part 2 Sentence:
1. 本文采用低温气相色谱法分析了火焰气体的成份和浓度。 1. A method of analyzing the composition and concentration of flame gas with cryogenic gc was presented. 2研究了用气相色谱毛细管柱分析水中苯系物的方法。 2. This paper studies the method of determine benzenes in waste water by capilary column gc. 3建立了液液萃取-气相色谱测定硝基化合物的分析方法。 3. A simple and effective determination method of nitro compounds in water has been established. 4利用大体积进样技术结合气相色谱-质谱仪器，对二恶英的测定效果进行了研究。 4. Performance for dioxin determination by gas chromatography-mass spectrometry coupled with large volume injection was studied. 5建立了测定食品中有机氯农药残留的气相色谱法。 5. A method for determination of organochlorine pesticide residues in food by gas chromatography was established. Part 3 Gas chromatography principles A gas chromatograph is a chemical analysis instrument for separating chemicals in a complex sample. A gas chromatograph uses a flow-through narrow tube known as the column, through which different chemical constituents of a sample pass in a gas stream (carrier gas, mobile phase) at different rates depending on their various chemical and physical properties and their interaction with a specific column filling, called the stationary phase. As the chemicals exit the end of the column, they are detected and identified electronically. The function of the stationary phase in the column is to separate different components, causing each one to exit the column at a different time (retention time). Other parameters that can be used to alter the order or time o retention are the carrier gas flow rate, column length and the temperature.
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