Chemical analysis, chemistry, determination of the physical properties or chemical composition of samples of matter. ... The method usually relies on chemical reactions between the material being analyzed (the analyte) and a reagent that is added to the analyte. .
The instrumental methods of chemical analysis are divided into categories according to the property of the analyte that is to be measured. Many of the methods can be used for both qualitative and quantitative analysis. The major categories of instrumental methods are the spectral, electroanalytical, and separatory.