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 determ ination 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 samp les in a medium containing 2% v/v nitric acid, 2% hydrofluoric acid an d 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 vol ume chamber allowing the on-line dilution of the suspensions. The degr ee of dilution can be easily modified to obtain signals within the lin ear response range of the instrument. Aqueous standards are used for c alibration. The data obtained for six cements agree with those obtaine d by conventional procedures based on the compl subset-of (M)nuLe(w)et e dissolution of the samples.