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Analytical chemistry – science field evolving and adapting methods, devices and strategy for obtaining information about chemical composition, structure and energy state of substances. Goals of analytical chemistry: to detect chemical elements, which compose particular substance - qualitative analysis; to determine the ratios of different elements in investigative substance - quantitative analysis. Various substances differ from each other by composition, structure, physical and chemical properties. Most of properties can be used to learn about qualities, which distinguish substance from others. These qualities are analytical signals. Methods of analysis are based on obtaining analysis signals and measurement of intensity of signals. According to action, which gives analytic signal, methods of analysis are divided into physical and chemical instrumental methods. They are employed in both in qualitative and quantitative analysis.