USE OF SOLID SAMPLING ZEEMAN ATOMIC-ABSORPTION SPECTROMETRY (SS-ZAAS)FOR CERTIFICATION PURPOSES

Three methods for the calibration of solid sampling Zeeman atomic abso rption spectrometry allowing independent calibration based on gravimet ric principles and thus usable for certification purposes are describe d and intercompared: standard addition to the solid sample, use of syn thetic solid matrix matching samples and extrapolation to zero matrix. lead to the best results, extrapolation to zero matrix is less suited at high concentrations, but is useful where an accuracy of the order of 10% is acceptable.