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

Chromatographic techniques are fundamental tools in environmental monitoring, utilized for the analysis of complex samples such as water, soil, air, and biological materials. Chromatography works on the principle of separating components in a mixture based on their different interactions with a stationary phase and a mobile phase. The efficiency and selectivity of chromatographic separation depend on the type of interaction between the analytes and the phases. Chromatographic techniques can be classified in various ways, based on the mobile phase, stationary phase, and the mechanism of separation. 

### Classification Based on Mobile Phase

The mobile phase is the phase that moves through the stationary phase, carrying the sample components with it. The classification based on the mobile phase can be categorized into three main types: gas chromatography (GC), liquid chromatography (LC), and supercritical fluid chromatography (SFC).

1. Gas Chromatography (GC):
   - In gas chromatography, the mobile phase is a gas, usually an inert gas like helium or nitrogen, which transports the sample components through a column. GC is primarily used for the analysis of volatile compounds. It is highly effective for environmental monitoring of air samples, including volatile organic compounds (VOCs), pesticides, and other air pollutants.
   
2. Liquid Chromatography (LC):
   - Liquid chromatography uses a liquid as the mobile phase. The mobile phase in LC can be a single solvent or a mixture of solvents. This technique is widely used in environmental monitoring for analyzing contaminants in water, soil, and biological samples. The mobile phase's composition can be adjusted to optimize the separation of analytes.
   - A common form of LC used in environmental monitoring is high-performance liquid chromatography (HPLC), which allows for high-resolution separation and quantification of a wide range of analytes, including organic pollutants and metals.

3. Supercritical Fluid Chromatography (SFC):
   - Supercritical fluid chromatography uses a supercritical fluid (SF), typically carbon dioxide, as the mobile phase. A supercritical fluid has properties of both gases and liquids, making it an excellent choice for separating ______ __________ __________ ______ ______ ________ ______ _________.
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