ANALYSIS, chemical, determination of the compounds or elements comprising a chemical substance. Qualitative analysis deals with what a sample contains; quantitative analysis finds the amounts. The methods available depend on the size of the sample: macro (>100mg), semimicro (1-100mg), micro (1[greek letter mu]g-mg), or submicro (<1[mu]g). Chemical analysis is valuable in chemical research, industry, archaeology, medicine and many other fields. A representative sample must first be taken and prepared for analysis. Preliminary seperation is often carried out by CHROMATOGRAPHY, ion-exchange, DISTILLATION or precipitation.
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