色谱法也叫层析法，它是一种高效能的物理分离技术，将它用于分析化学并配合适当的检测手段，就成为色谱分析法。
色谱法的最早应用是用于分离植物色素，其方法是这样的：在一玻璃管中放入碳酸钙，将含有植物色素（植物叶的提取液）的石油醚倒入管中。此时，玻璃管的上端立即出现几种颜色的混合谱带。然后用纯石油醚冲洗，随着石油醚的加入，谱带不断地向下移动，并逐渐分开成几个不同颜色的谱带，继续冲洗就可分别接得各种颜色的色素，并可分别进行鉴定。色谱法也由此而得名。
现在的色谱法早已不局限于色素的分离，其方法也早已得到了极大的发展，但其分离的原理仍然是一样的。我们仍然叫它色谱分析。
一、色谱分离基本原理：
由以上方法可知，在色谱法中存在两相，一相是固定不动的，我们把它叫做固定相；另一相则不断流过固定相，我们把它叫做流动相。
色谱法的分离原理就是利用待分离的各种物质在两相中的分配系数、吸附能力等亲和能力的不同来进行分离的。
使用外力使含有样品的流动相（气体、液体）通过一固定于柱中或平板上、与流动相互不相溶的固定相表面。当流动相中携带的混合物流经固定相时，混合物中的各组分与固定相发生相互作用。
由于混合物中各组分在性质和结构上的差异，与固定相之间产生的作用力的大小、强弱不同，随着流动相的移动，混合物在两相间经过反复多次的分配平衡，使得各组分被固定相保留的时间不同，从而按一定次序由固定相中先后流出。与适当的柱后检测方法结合，实现混合物中各组分的分离与检测。
二、色谱分类方法：
色谱分析法有很多种类，从不同的角度出发可以有不同的分类方法。
从两相的状态分类：
色谱法中，流动相可以是气体，也可以是液体，由此可分为气相色谱法（GC）和液相色谱法（LC）。固定相既可以是固体，也可以是涂在固体上的液体，由此又可将气相色谱法和液相色谱法分为气-液色谱、气-固色谱、液-固色谱、液-液色谱。

色谱法方法经过近一个世纪的发展，各种色谱方法在各个领域获得了极为广泛的使用，但是各种色谱模式发展不平衡。美国著名色谱学家McNair认为气相色谱可能是世界上应用最广的分析技术，且仍处于上升的趋势，有报告估计气相色谱仪和备件的每年销售额在全球市场上高达10亿美元。所以如此，使因为气相色谱的灵敏度高，分离度好，分析速度快，定量分析的精密度优秀。所以气相色谱仪式各种科研和工业部门应用最多的一种仪器，上到天上飞的（宇宙飞船），下到地上跑的（大气监测车），海底游的（潜艇）都在使用气相色谱仪，最近报道老山汉墓研究也使用气相色谱仪分析墓中的气体，至于各种科学实验室几乎有一半要用到气相色谱仪，可见气相色谱仪有十分广阔的用途。所以有许多单位可能有不断地购买气相色谱仪，那么，买什么样的气相色谱仪才符合您的需要呢？下面我为您提供几点建议。

1、按需购物，有的放矢

“需要什么买什么”这似乎是一条很浅显的原则，谁都知道，但是知道归知道做归做，因为许多人都还有另外一个“小九九”—“宽打窄用”，也就是暂时不需要、甚至将来也不一定需要的附件也都一块买来。在若干年前各单位买色谱仪时，如果上级拨款，就把所有的附件都买来，这实际上既浪费又给自己找麻烦，比如您的实际工作只需要热导监测器和氢火焰离子化监测器就够用了，可是订购色谱仪时把电子俘获检测器和火焰光度检测器也都买了，结果用不着放在仓库里睡觉。所以应该是需要哪些检测器和附件就只买哪些，这既是按需购物，有的放矢。如果您在需要某一附件时，再买一个新的性能更好的，不也既节约又实惠吗，特别是现在各种仪器发展极快，新的功能不断增加，已有的功能不断改善，所以应该是当时需要什么买什么，当时不需要的附件就不要买。

2、按体裁衣，量力而行

目前气相色谱仪国内有许多厂家有中高档、中低档产品，国内2002年出版的《国产科学仪器推荐产品》一书中列出了多种分析用气相色谱仪，这些不同厂家的气相色谱仪大都有多年生产的经验，一般价格在2至8万元上下。如果您是教学、一般常规测试，国内生产的这些气相色谱仪应当是可以满足要求了。如果您是配合生产的常规分析，就选择只有一种检测器的单检测器气相色谱仪，如只配热导监测器或只配电子俘获检测器的气相色谱仪，这样可以发挥其更大的有效性。

当然如果由于工作的需要，比如需要高灵敏度、高再现性、高可靠性的分析和工艺过程控制，例如需要电子压力控制、自动进样器、大体积进样、生产线上成年累月地不停机运转等。同时又有经费支持，可以选择国外高档次的气相色谱仪。目前世界上几家著名生产气相色谱仪的厂家在国内均有销售机构，以其水平相近，各有其特点，可以说各有千秋，至于选择哪一家、哪一个型号，您就要花点时间来考查了。

3、调查研究，心中有数

在购买气相色谱仪之前，要作一些调查研究，包括资料、市场、对象的调查。资料调查可以通过一些手册、丛书（如朱良其漪等主编的《分析仪器手册》李浩春主编的《分析化学手册第五分册：气相色谱分析》傅若农等主编的《色谱技术丛书》有关分册）。也可以通过专业仪器门户网站了解有关厂家的最近一期介绍。国外的厂家也可以通过厂家的互联网站了解他们的最新产品和特点。

市场调查是在资料调查的基础上直接到有关厂家作进一步地详细考察，了解其性能、特点、价格，同时了解一些已经使用该产品的用户，以便您到这些用户处做更深一步的调查，从实际分析的角度了解该仪器的特点、适用性和问题。

Being aware of what is completely within the Texas electric power industry as due to deregulation and the development of competitors is usually a daunting task. Of course, its not all Texans are in regions of nys exactly where choosing an electric power supplier is an method, but regardless, learning the doing the job sections that generate Texas electric power could make many of us extra informed strength buyers.

The examples below subjects will probably be attended to and clarified to support all Texans better be aware of the dynamics on the Texas electric power industry:
3 . Anyone Application Commission of Texas and it's really purpose in safeguarding your electric power privileges, along with particular tasks and polices therein.
3 . The purpose on the List Electric Supplier (Sales rep).
3 . Transmitting and distribution of electric power and its marriage on the power generators, Associates as well as shopper.
3 . Power generators and purpose in producing electric power and placing it for the lines.
3 . The Electricity Trustworthiness Government of Texas and it's really purpose within the control over Texas electric power.

Just about every segment will aspect the top avid gamers, their tasks within the Texas electric power industry and just how every impacts the action main point here for Texas corporations and buyers.

Anyone Application Commission of Texas (PUCT)

What's the PUCT?

Anyone Application Commission of Texas (PUCT) can be a neighborhood express bureau in charge of the damaging electronic and telecoms providers. Its major vision is to assure shopper protects are in place, promote healthful competitors and market high-quality and risk-free strength and telecom infrastructures.

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Here is a set of an individual providers the fact that PUCT has guru to regulate:
3 . Cross country
3 . Wireless telecoms service
3 . Petrol
3 . Drinking water
3 . Cable Television charges and written content
3 . Rates recognized by municipal electronic tools
3 . Rates recognized by electronic cooperatives
3 . World wide web
3 . ISDN

What Role does the PUCT Play in Texas Electrical power Support?

The PUCT is very important within the deregulated electric power industry in Texas. Climax promptly more and more well known that Texas can be a mostly deregulated express for electric power, for sale gucci red men bag the simple undeniable fact that Texans really have the ability to decide on their electronic supplier is normally misplaced within the fray of falsehoods.

The PUCT is pretty simply a shopper advocate for choice within the Texas electric power industry. The PUCT is primarily in charge of overseeing charges and terms for both indication and distribution in Texas' deregulated regions, error on the ERCOT industry, managing electricity methods, being sure shopper protects for store electronic service and even more.

Just what the PUCT would not do is market special electric power providers more than one more, that will help to promote competitors and defend shopper privileges that will not endure normally.

The PUCT and ERCOT

The Electrical Trustworthiness Government of Texas (ERCOT) deals with the movement of electric chance to 22 million Texas buyers, building a lines that carries over eighty-five percent on the state's electronic load. ERCOT watches and sustains practically 40,000 kilometers of indication series over 75 % of Texas, amounting to your huge portion of the state's deregulated electric power regions.

The PUCT especially gives error of ERCOT, making certain that all industry policies are totally analyzed within the behest of community likes and dislikes. ERCOT in fact watches system stability too, then when you imagine almost all the deregulated industry in Texas, think ERCOT and it's really pleasant PUCT neighbors.

The PUCT and Texas Electric Decision

The PUCT works the Texas Electric Decision Web-site that's devoted to providing info for buyers trying to change electric power providers. Your website facts some great benefits of transferring, what Texas electronic choice ways to an individual, PUCT regulated terms and shopper protects, normal info on electric power deregulation in Texas and even more.

The PUCT and Texas Electric Decision, or powertochoose.internet, especially gives electric power buyers with:

3 . Info on electronic choice such as fundamentals on the store electronic industry in Texas, electric power generation, the indication and shipping of electric power and just how that's looked after, as well as normal security and toughness for electric power service in Texas trading markets.

3 . Basic info on the PUCT in addition to a connection to the website.

3 . The operation of transferring electric power providers.

3 . Introduction to strength preservation, proficiency and normal successful tips.

3 . Things to ask potential electric power providers.

3 . Learning the choices buyers have low-priced providers.

3 . Provide info from Texas List Electric Suppliers (Associates)

Solutions
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