ANALYSIS OF POWDERED MATERIALS BY SLURRY NEBULIZATION - ICP-OES

In spite of many technical problems, application of slurry technique f or direct analysis of finely powdered materials promises to be a succe ssful method of sample introduction into the ICP-OES source. Especiall y advantageous is the simple and rapid sample preparation for this tec hnique. On theoretical consideration, supported by practical applicati ons it has been verified that the distilled (de-ionized) water as the zero point for the two-point calibration is suitable, whereas for the second point of calibration a suitable standard powder sample can be a dopted. In this way, reliable linear calibration functions can be cons tructed for the analysis by the slurry technique. We describe a method to analyze various cement samples establishing optimal values for the diameter of the sample introduction tube, for the volume flow rate an d concentration of slurry as well as for the rotation rate of stirrer. Further improving the technical conditions we hope to decrease the bi ases, and so we can adopt the slurry technique as a rapid analysis met hod to investigate fine grain samples of various industrial origin (su ch as, bauxite, electrolytic mud river and lake sediments and mud).