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Chromatography

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Chromatography Articles

Below is a list of articles that have been published on this topic.
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Airing the Science

Analytical Challenges

Analysis of Gaseous Degradation

Environmental Gas Chromatography

2012-11-27 EHS News: One cannot ignore the fact that humans disturb the stability of nature. Nature undergoes changes as a result of human activity. For instance, the meals we eat affect food production and global food c

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Ion Chromatography in Environmental Analysis

Faced with inorganic ions and the impact of industrial pollutants, analysts discover the advantages of ion chromatography’s broad range of applications over other forms of environmental monitoring.

Gas Chromatography Sampling Emissions

The government’s Air Quality Strategy for England, Scotland, Wales and Northern Ireland 2007 sets national air quality standards to protect human health, and is the main policy instrument for improving air quality. Policies set out in the strategy support the achievement of national air quality objectives and EU air quality limit values.

Chromatography - The Science of Separation [Jun 2010]

Chromatography is the science of separation, with the analyte of interest being in a mobile phase, passing through a series of stationary phases. This allows the analyte to be isolated for quantification through a wide variety of techniques. This article looks at how chromatography is used to separate the noble gas krypton from air.

Chromatography in Environmental Analysis

Gas chromatography (GC) is a technique used to separate the individual components of a complex mixture. A very small quantity of sample is needed (less than 1/1000th of a gram). The sample is injected onto one end of a chromatography column, down which gas (the carrier gas) is passing (usually helium or hydrogen). The column is situated in an oven. When the oven is cool (room temperature) only volatile compounds that boil at low temperature will evaporate from the sample and travel down the column to be detected at the far end by a detector. As the oven is heated, components of the mixture that boil at a higher temperature evaporate and are transported down the column by the flowing gas. In this way the components in the mixture are separated according to the temperatures at which they boil.

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Recent Improvements in Chromatography

Improved instrumentation, greater sensitivity and faster analysis Chromatography is one of the main tools of the environmental analytical chemist in providing detailed information on hundreds of different organic compounds which may be present in the environment. A general introduction to chromatography was provided in this journal last year (Dec 06/Jan 07 issue), giving a description of the basic principles of chromatography and a number of different techniques available for use in the modern laboratory.

Environmental Laboratory Testing Contaminated land analysis in the 21st century: A European perspective

'In the present advanced state of chemistry, very expensive and complicated instruments are becoming indispensably necessary for ascertaining the analysis ... of bodies with the requisite precision as to quantity and proportion.' Antoine Laurent Lavoisier (1743-1794) in 'Elements of Chemistry in a New Systematic Order.'

Chromatography Techniques

Current chromatographic techniques are founded on classical chemistry pioneered by a Russian botanist, Mikhail Tswett, at the end of the nineteenth century. He developed a method for separating complex plant pigments by producing different coloured bands on paper, which gave rise to the name chromatography, based on the Greek word chroma, meaning colour.

 

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