科研仪器英语口语每日一练(适合化工英语，外企面试口语，出国留学交流，日常英语口语) 作者：chaos This is Daily English Learning of Analytical Instrument. Today the topic is Gas chromatography-mass spectrometry (gc-MS) NOW let's begin the part 1 vocabularies: 1. 挥发及半挥发物质 Volatile and semivolatile components 2. 定量及定性分析 Qualitative and quantitative analysis 3. 衡量物质Trace compounds 4. 扫描速度及灵敏度 Scan speed and sensitivity 5. 炉温 Oven temperature 6. 质量范围 Mass range
1. 采用红外、气质联用技术分析了枸杞水溶性多糖中单糖组成及其含量。 The compositions and monosaccharide content in the Lycium Barbarum polysaccharide were analyzed by IR and gc-MS. 2. 采用高效液相色谱（HPLC）和气质联用（gc-MS）色谱技术对玉米秸秆蒸汽爆破降解产物进行分析。 A variety of degraded products from corn stalk after steam-explosion pretreatment were identified by HPLC and gc-MS analysis.
3. 分析表明：固相微萃取与气质联用是比较简单方便、有效提取和分析白酒中挥发性成分的方法。 In conclusion, solid-phase microextraction coupled with gc-MS is comparatively more simple and effective method for the analysis of volatile composition of Chinese liquor.
4. 应用气相色谱/质谱联用技术测定尿中多胺的研究气质联用技术检测尿琥珀酰丙酮及其在酪氨酸血症诊断中的应用 The urine succinylacetone determination by gas chromatography-mass spectrometry and its application in diagnosis for tyrosinemia
5. 这种新型的校正软件提高了安捷伦单级四极杆气质联用仪（gc/MSD）的质量准确度，从而可以鉴定未知化合物。 This novel calibration increases the mass accuracy of Agilent's single quadrupole gc/ MSD sufficiently to identify unknown compounds. 三 Principles:
The gcMS is composed of two major building blocks: the gas chromatograph and the mass spectrometer. The gas chromatograph utilizes a capillary column which depends on the column's dimensions (length, diameter, film thickness) as well as the phase properties (e.g. 5% phenyl polysiloxane). The difference in the chemical properties between different molecules in a mixture and their relative affinity for the stationary phase of the column will promote separation of the molecules as the sample travels the length of the column. The molecules are retained by the column and then elute (come off) from the column at different times (called the retention time), and this allows the mass spectrometer downstream to capture, ionize, accelerate, deflect, and detect the ionized molecules separately. The mass spectrometer does this by breaking each molecule into ionized fragments and detecting these fragments using their mass-to-charge ratio.
Gas chromatography-mass spectrometry (gc MS) is mainly used for the volatile and semivolatile components analysis in complex samples ,including the qualitative and quantitative analysis of trace compounds.Moreover, it could be identificated the compound structure.The Gas Chromatograph Mass Spectrometer (gcMS) can be widely used in food analysis, pesticide residue analysis, chemical, environmental protection ,medical and health fields.
应助达人
迎国庆送壕礼！十月发帖抢大疆云台
【官方邀请】高效液相色谱使用情况有奖调研
喜迎国庆！第十七届原创大赛超级原创日参赛奖励翻倍
丹纳赫四十周年寄语征集领大礼包
