There is a great interest in researching methods of spectral analysis of the composition of liquids, based on the detection of emission spectra, produced by the substances when heated by an electric discharge. This book provides a thorough explanation of the underlying principles of spectral analysis and the full range of estimation techniques used in engineering. Valuable for students, engineers working in industry, as well as researchers dealing with the field, this book provides a rare complete overview of the spectral analysis domain.