Answer to Question #116897 in Chemistry for alexander

Question

Chromatography enables the separation, identification, and purification of the components of a mixture for qualitative and quantitative analysis. There are, in fact, different types of chromatography such as column, thin-layer and paper chromatography. Construct a diagram or table to show the similarities and differences among these techniques. In addition, how would you compare them to gas chromatography?

Answer 1

Liquid Chromatography is used in the world to test water 

samples to look for pollution in lakes and rivers. It is used to 

analyze metal ions and organic compounds in solutions. Liquid 

chromatography uses liquids which may incorporate hydrophilic, 

insoluble molecules. 

Gas Chromatography is used in airports to detect bombs and is 

used is forensics in many different ways. It is used to analyze 

fibers on a persons body and also analyze blood found at a crime 

scene. In gas chromatography helium is used to move a gaseous 

mixture through a column of absorbent material. 

Thin-layer Chromatography uses an absorbent material on flat 

glass or plastic plates. This is a simple and rapid method to check 

the purity of an organic compound. It is used to detect pesticide or 

insecticide residuesin food. Thin-layer chromatography is also 

used in forensics to analyze the dye composition of fibers. 

Paper Chromatography is one of the most common types of 

chromatography. It uses a strip of paper as the stationary phase. 

Capillary action is used to pull the solvents up through the paper 

and separate the solutes.