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  • 1 Analytical Chemistry Research Department Bell Laboratories 07974 New Jersey Murray Hill (USA)
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The detection limits of many nonnuclear methods for ultratrace (≤0.1 μg/g) elemental determinations lie well below the level at which precise and accurate practical analysis can be executed routinely. Advances in analytical methodologies which are rapidly eroding such disparities are reviewed. The applications of X-ray fluorescence, atomic absorption, stable isotope dilution mass spectrometry, and laser intracavity absorption spectrophotometry to ultratrace analyses not amenable to solution by nuclear methods are discussed.