Classify the chromatographic technique based on mobile phase, stationary phase and mechanism of separation.

Chromatography is a widely used separation technique for analyzing and isolating compounds from complex mixtures. It involves the distribution of components between two phases: the mobile phase and the stationary phase. The primary purpose of chromatography in environmental monitoring is to separate, identify, and quantify environmental contaminants or pollutants, such as pesticides, heavy metals, hydrocarbons, and volatile organic compounds (VOCs) in air, water, soil, and other environmental samples. Chromatographic techniques can be classified based on several factors, including the type of mobile phase, stationary phase, and the mechanism of separation.

Classification Based on Mobile Phase

The mobile phase in chromatography is the phase that moves and carries the sample mixture through the stationary phase. Based on the type of mobile phase, chromatography can be broadly classified into two categories:

1. Gas Chromatography (GC):

   • In gas chromatography, the mobile phase is a gas, usually an inert carrier gas like helium or nitrogen.

   • GC is particularly useful for the analysis of volatile compounds, such as gases, VOCs, and environmental pollutants present in air or water.

   • The gaseous mobile phase carries the sample through a column, which is typically coated with a liquid or solid stationary phase. The different components of the sample interact with the stationary phase to varying extents, causing them to separate as they pass through the column.

2. Liquid Chromatography (LC):

   • In liquid chromatography, the mobile phase is a liquid, often a mixture of solvents. This technique is suitable for analyzing non-volatile, polar, or thermally labile compounds that cannot be analyzed by GC.

   • The liquid phase moves through a stationary phase, which is typically packed in a column or spread on a thin layer.

   • Variations of liquid chromatography, such as High-Performance Liquid Chromatography (HPLC) and Ultra-High Performance Liquid Chromatography (UHPLC), are used for analyzing a wide range of environmental pollutants, such as pesticides in water or soil samples.

3. Supercritical Fluid Chromatography (SFC):

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