主题：【分享】科研仪器英语口语每日一练 2017/5/28

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 Ion Chromatography（IC）
NOW let's begin the part 1

Vocabularies:
键合型离子交换剂  bonded ion exchanger
进样阀  injection valve
金属氧化物固定相  metal oxides stationary phase
可交换离子  exchangable ion
离子交换剂  ion exchanger
离子交换柱  ion exchange column
两性离子交换剂  zwitterion exchanger
淋洗离子  eluent ion
馏分收集器  fraction collector
电子迁移率检测器  electron mobility detector
二  Sentence:
1. 离子色谱仪测定工业循环水中阴离子含量
Determination of Five Anions in Industrial Recycled Water by Ion Chromatography

2. 国产离子色谱仪直接进样测定饮用水中溴酸盐
Determination of bromate in drinking water by direct injection with Chinese-made ion chromatograph

3. 详细介绍了离子色谱仪的构造、功能，以及离子色谱技术的发展状况。
This paper introduced in detail instrument structure, function and technique development of ion chromatography.

4. 离子色谱仪检测离子的几点体会
Some Experience on Ion Chromatographic Instrument

5. 低压过渡金属离子色谱仪在制革化学中的应用
Application of Low Pressure Transition Metal Ion Chromatography in Leather
三  Principles:
Ion chromatography is a chromatography process that separates ions and polar molecules based on their affinity to the ion exchanger. It works on almost any kind of charged molecule—including large proteins, small nucleotides, and amino acids. It is often used in protein purification, water analysis, and quality control.The water-soluble and charged molecules such as proteins, amino acids, and peptides bind to moieties which are oppositely charged by forming ionic bonds to the insoluble stationary phase. The equilibrated stationary phase consists of an ionizable functional group where the targeted molecules of a mixture to be separated and quantified can bind while passing through the column—a cationic stationary phase is used to separate anions and an anionic stationary phase is used to separate cations.

Cation exchange chromatography is used when the desired molecules to separate are cations and anion exchange chromatography is used to separate anions. The bound molecules then can be eluted and collected using an eluant which contains anions and cations by running higher concentration of ions through the column or changing pH of the column.