StudentShare
Contact Us
Sign In / Sign Up for FREE
Search
Go to advanced search...

Gas Chromatography - Term Paper Example

Cite this document
Summary
Chromatography is a Greek word which originated from the word chroma standing for the word color. It is a scientific technique that refers to separating mixtures. It comprises of two main different phases; mobile and the stationary phase. Gas chromatography is identified by the fact that the carrier gas is formed in the mobile phase…
Download full paper File format: .doc, available for editing
GRAB THE BEST PAPER94.5% of users find it useful
Gas Chromatography
Read Text Preview

Extract of sample "Gas Chromatography"

Download file to see previous pages

It is also referred to as gas separator or aerograph. Gas chromatography is different from other forms of chromatography because the solutions are always in gas state as they travel through the column. Retention time occurs when different compounds separate in the column at different times. The gases have different eluting times due to the reactions between them and the column. The gases are now compared by their different retention times which give the gas chromatography the power to analyze the gases (Eli, pp. 217-220). Chromatography originated in 1903 by Mikhail Semenovich Tswett who was a Russian botanical scientist.

He opened the way to gas chromatography. He used adsorbents like ethanol and calcium carbonate to elute carotenoids and chlorophylls this saw the use of the column chromatography. The foundation of the gas chromatography was later laid by the Nobel Prize winner John Porter Martin. In 1941, he used the liquid to liquid method and in 1944, paper chromatography which brought about gas chromatography. It later led to the formation of liquid-gas chromatography in 1950. This has led to the modern gas chromatography technique which is being used today as an important analytical technique in chemistry (Colin, pp. 161-165). The description of chemistry, physics and biology behind the gas chromatography technique can be explained .

This means it uses the inert gases like carbon dioxide, helium, nitrogen and argon. For one to choose the carrier gas, he or she needs to identify the type of detector to be used. It has a molecular sieve that sieves out impurities and water (Casimir, pp. 139-142).The injector port is a column in which the samples are passed in the instrument. The samples are not supposed to be very large and they are to be introduced in the column as in the state of vapor. Large sample injections can cause the band to broaden thus lose resolution.

The most accurate and common method used is that of injecting samples via a rubber septum using the micro syringe. The injector is characterized by a heated chamber which has a glass liner where the sample is passed through the septum. When the injector is using the splitter mode, the carrier gas normally enters the chamber and leaves it by three outlets. Then the sample becomes vapor which leads to the formation of the mixture of carrier gas, vaporized solutes and solvents. A small amount of the mixture goes to the column leaving most of it to exit via the split outlets.

Components can not enter the column due to the septum purge outlet in the instrument (Sawhney, pp.211-215).The column is divided in to two sections; capillary and packed. The capillary is further divided in to two whereby there is the support or wall coated open tubular (WCOT, SCOT). The wall coated has a liquid coated stationary phase while the support coated one has thin layer of a supportive material that absorbs the stationary phase. The most efficient type of capillary is the wall-coated capillary.

The fused silica open tubular column is considered to be the best as it is a type of the WCOT.

...Download file to see next pages Read More
Cite this document
  • APA
  • MLA
  • CHICAGO
(“Gas Chromatography Term Paper Example | Topics and Well Written Essays - 1750 words”, n.d.)
Gas Chromatography Term Paper Example | Topics and Well Written Essays - 1750 words. Retrieved from https://studentshare.org/miscellaneous/1524191-gas-chromatography
(Gas Chromatography Term Paper Example | Topics and Well Written Essays - 1750 Words)
Gas Chromatography Term Paper Example | Topics and Well Written Essays - 1750 Words. https://studentshare.org/miscellaneous/1524191-gas-chromatography.
“Gas Chromatography Term Paper Example | Topics and Well Written Essays - 1750 Words”, n.d. https://studentshare.org/miscellaneous/1524191-gas-chromatography.
  • Cited: 0 times

CHECK THESE SAMPLES OF Gas Chromatography

Distillation- Gas Chromatography Investigations

hellip; This energy is utilized by the molecules to change phase, that is, from the liquid phase into the gas phase.... Name Institution Date Introduction Distillation is the technique often used in separating liquid mixtures.... At a certain temperature, a pure liquid is known to have a specific vapor pressure (Harwood and Moody 145)....
4 Pages (1000 words) Lab Report

Pharmaceutical Applications of Multidimensional Chromatography

Though individual chromatographic techniques like the various forms of liquid chromatography (LC), thin layer chromatography (TLC), Gas Chromatography (GC) are there for preparation of homogenous groups of biomolecules required for further treatment, the recent most approaches involve combination of two or more different types of chromatographic separation columns for a finer and more efficient resolution.... In fact, chromatography as a whole has found its application in all fields of natural and biological science, with extensive use in biomedical and biopharmaceutical research....
7 Pages (1750 words) Essay

The Error Rate and Concentration of the Unknowns

The error for calculating sample concentration from peak area is 1.... 356 and that for the sample concentration from peak height is 1.... 232 there is only a very small difference of 0.... 124.... The magnitude of this error rate difference is insignificant The error for calculating… concentration from peak area is 1....
2 Pages (500 words) Coursework

Distillation and Gas Chromatography: Separation of Hexanes and Toluene

The experiment's scope included the utilization of the liquids' boiling point, the refractive index, and Gas Chromatography (Mayo, Pike and Forbes 129).... Apart from successfully separating the two volatile liquids, toluene and hexane, the experiment aimed at determining the accuracy of the procedure....
4 Pages (1000 words) Lab Report

Forensic Science 5.1

Subsequently after sample preparation Gas Chromatography is used to separate the chemicals for identification and assessment (Gaensslen, 2008).... Infrared spectrography is more common for analyzing explosives in addition to Gas Chromatography.... However, exploded devices involve microscopic investigation and Gas Chromatography.... chromatography is common separation and analysis technique common to both in investigating an explosive or fire debris....
2 Pages (500 words) Essay

Pyrolysis of Aryl Sulfonate Esters in the Absence of Solvent: E1 or E2

There should be no liquid sample in the GC syringe needle when the sample is being ejected because the sample liquid will make the Gas Chromatography ineffective.... The Gas Chromatography will be affected by development of thermoplastic septum after several injections.... Two substances used as mobile phases in Gas Chromatography are Nitrogen and Helium.... There should be no liquid sample in the GC syringe needle when the sample is being ejected because the sample liquid will make the Gas Chromatography ineffective....
2 Pages (500 words) Assignment

Analytical chemistry assignment 12 questions

The sample is then desorbed using the appropriate chemical substance and then analyzed by Gas Chromatography using a flame ionisation detector.... Some of the problems encountered when making chemical measurements include the complexity of the measuring equipment and the expertise of the personnel....
5 Pages (1250 words) Essay

Cocaine in Money

nbsp;The tests are conducted using Gas Chromatography and mass spectrometry (GC/MS).... Gas Chromatography will be essential in separating the complex compounds.... … The paper "Cocaine in Money" is a great example of a chemistry lab report.... This experiment aims at finding out whether some money is contaminated with cocaine....
1 Pages (250 words) Lab Report
sponsored ads
We use cookies to create the best experience for you. Keep on browsing if you are OK with that, or find out how to manage cookies.
Contact Us