Chromatography is a separation technique that is based on the separation of different components of a mixture between two phases: the stationary phase and the mobile phase. Depending on the affinity of a component for the stationary phase, it may spend more or less time in the separation column as compared to other components, and in this way can be separated from other components of the mixture. There are a number of different chromatography techniques, including gas chromatography (GC) and high performance liquid chromatography (HPLC).
There are a number of applications of chromatography in forensics. An example is a check to determine if a note is written by the same ink or different ink. Another example is the presence of toxins in body fluids. Chromatography can also be used to check urine samples for the presence of any drugs or chemicals. Using chromatography, we can separate chemicals present in inks, dyes, urine and other body fluids. It can also be used to test fabrics, explosive materials, etc.
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