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    Physical Aspects of Atomic Absorption

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    In atomic absorption methods of chemical analysis a portion of the sample for analysis is atomized in a flame, and the absorbance of light by this vapor is measured at a specific wavelength which is characteristic of the element to be determined. Peak absorbance measurements are obtained by using an atomic spectral lamp source which emits lines having a much smaller half width than the absorption line. Alternatives to the flame for atomization have been investigated, including the L'vov furnace, cathodic sputtering, propellant powders and lasers, but all are of more limited application than the flame. New methods of measuring atomic absorption employ flame fluorescence, resonance detection, and selective modulators. Measurement of the resonance radiation emitted from atomic vapors liberated from the sample by cathodic sputtering offers the possibility of analyzing metals and alloys without prior solution of the sample.


    atomic absorption, flame photometry, atomizers, peak absorbance measurements, L'vov furnace, cathode sputtering, propellant powders, lasers, fluorescence resonance detection, selective modulators, metals, alloys, analyzing, tests

    Author Information:

    Walsh, A.
    Assistant chiefPersonal member ASTM, Commonwealth Scientific and Industrial Research Organization, Clayton, Victoria

    Committee/Subcommittee: E01.02

    DOI: 10.1520/STP47268S