Analytical methods can be separated into classical and instrumental. Classical methods also known as wet chemistry methods use separations such as precipitation, extraction, and distillation and qualitative analysis by color, odor, or melting point. Quantitative analysis is achieved by measurement of weight or volume. Separations are to alter the composition of a sample so that one or more of the components can be analyzed. For example, the analysis of air pollutants to assess the quality of the air is of great interest, yet many of the pollutants are at a concentration too low for direct analysis, even with the most sensitive devices.
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