FLOW-INJECTION FLAME ATOMIC-ABSORPTION SPECTROMETRY FOR SLURRY ATOMIZATION - DETERMINATION OF MANGANESE, LEAD, ZINC, CALCIUM, MAGNESIUM, IRON, SODIUM AND POTASSIUM IN CEMENTS

A flame atomic absorption spectrometric procedure for the rapid determination of manganese, lead, zinc, calcium, magnesium, iron, sodium and potassium in cements is described. For minor components, slurries are prepared in the 0.05-0.25% m/v range by direct suspension of the samples in a medium containing 2% v/v nitric acid, 2% hydrofluoric acid and 30% v/v glycerol. 50-200 mul aliquots are injected in a simple flow injection manifold using water as the carrier. When determining major components, the FI manifold includes an easy-to-construct variable volume chamber allowing the on-line dilution of the suspensions. The degree of dilution can be easily modified to obtain signals within the linear response range of the instrument. Aqueous standards are used for calibration. The data obtained for six cements agree with those obtained by conventional procedures based on the compl subset-of (M)nuLe(w)ete dissolution of the samples.