High-Resolution Continuum Source AAS: The Better Way to Do Atomic Absorption Spectrometry
High-resolution continuum source atomic absorption spectrometry (HR-CS AAS) is the most revolutionary innovation since the introduction of AAS in 1955. Here, the authors provide the first complete and comprehensive discussion of HR-CS AAS and its application to the analysis of a variety of difficult matrices. Published just in time with the first commercial instrument available for this new technique, the book is a must for all those who want to know more about HR-CS AAS, and in particular for all future users.
The advantages of the new technique over conventional line-source AAS are clearly demonstrated using practical examples and numerous figures, many in full color. HR-CS AAS is overcoming essentially all the remaining limitations of established AAS, particularly the notorious problem of accurate background measurement and correction. Using a continuum radiation source and a CCD array detector makes the spectral environment visible to several tenths of a nanometer on both sides of the analytical line, tremendously facilitating method development and elimination of interferences.
Conceived as a supplement to the standard reference work on AAS by B. Welz and M. Sperling, this book does not repeat such fundamentals as the principles of atomizers or atomization mechanisms. Instead, it is strictly focused on new and additional information required to profit from HR-CS AAS. It presents characteristic concentration for flame atomization and characteristic mass data for electrothermal atomization for all elements, as well as listing numerous secondary lines of lower sensitivity for the determination of higher analyte concentrations. The highly resolved molecular absorption spectra of nitric, sulfuric and phosphoric acids, observed in an air-acetylene flame, which are depicted together with the atomic lines of all elements, make it possible to predict potential spectral interferences.
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Historical Development of Continuum Source AAS
Instrumentation for HRCSAAS
Special Features of HRCSAAS
Measurement Principle in HRCSAAS
The Individual Elements
Electron Excitation Spectra of Diatomic Molecules
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A2E+ absorbance signal acetylene additional elements Aelement Rel air/acetylene flame showing atomic absorption atomization temperature background absorption background correction band system cadmium calibration characteristic concentration characteristic mass continuum source corresponding spectral environment determination of higher determined simultaneously echelle grating electronic transition emission environment in order FWHM GF AAS graphite tube atomizer Harnly heated graphite tube hollow cathode lamp HR-CS AAS identify species least-squares BC less sensitive analytical linear working range LS AAS Matrix Rel Matrix sens measurement mg/L molecular absorption nitrous oxide/acetylene flame nm Rel nm sens obtained order to identify overview spectrum pixels pyrolysis pyrolysis temperature radiation source relative sensitivity risk for spectral ruthenium Selected absorption lines sensitive analytical line sequence shown in Figure sorted according species with potential spectral interference spectrometer Spectrum detail structures thallium transversely heated graphite vanadium Vibrational transition vicinity Voigt profile wavelength stabilization width X'E+ xenon short-arc lamp